--- /dev/null
+/* jobs.c - functions that make children, remember them, and handle their termination. */
+
+/* This file works with both POSIX and BSD systems. It implements job
+ control. */
+
+/* Copyright (C) 1989-2012 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#include "bashtypes.h"
+#include "trap.h"
+#include <stdio.h>
+#include <signal.h>
+#include <errno.h>
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#include "posixtime.h"
+
+#if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_WAIT3) && !defined (_POSIX_VERSION) && !defined (RLIMTYPE)
+# include <sys/resource.h>
+#endif /* !_POSIX_VERSION && HAVE_SYS_RESOURCE_H && HAVE_WAIT3 && !RLIMTYPE */
+
+#if defined (HAVE_SYS_FILE_H)
+# include <sys/file.h>
+#endif
+
+#include "filecntl.h"
+#include <sys/ioctl.h>
+#if defined (HAVE_SYS_PARAM_H)
+#include <sys/param.h>
+#endif
+
+#if defined (BUFFERED_INPUT)
+# include "input.h"
+#endif
+
+/* Need to include this up here for *_TTY_DRIVER definitions. */
+#include "shtty.h"
+
+/* Define this if your output is getting swallowed. It's a no-op on
+ machines with the termio or termios tty drivers. */
+/* #define DRAIN_OUTPUT */
+
+/* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */
+#if defined (hpux) && !defined (TERMIOS_TTY_DRIVER)
+# include <bsdtty.h>
+#endif /* hpux && !TERMIOS_TTY_DRIVER */
+
+#include "bashansi.h"
+#include "bashintl.h"
+#include "shell.h"
+#include "jobs.h"
+#include "execute_cmd.h"
+#include "flags.h"
+
+#include "builtins/builtext.h"
+#include "builtins/common.h"
+
+#if !defined (errno)
+extern int errno;
+#endif /* !errno */
+
+#if !defined (HAVE_KILLPG)
+extern int killpg __P((pid_t, int));
+#endif
+
+#if !DEFAULT_CHILD_MAX
+# define DEFAULT_CHILD_MAX 32
+#endif
+
+#if !MAX_CHILD_MAX
+# define MAX_CHILD_MAX 8192
+#endif
+
+#if !defined (DEBUG)
+#define MAX_JOBS_IN_ARRAY 4096 /* production */
+#else
+#define MAX_JOBS_IN_ARRAY 128 /* testing */
+#endif
+
+/* Flag values for second argument to delete_job */
+#define DEL_WARNSTOPPED 1 /* warn about deleting stopped jobs */
+#define DEL_NOBGPID 2 /* don't add pgrp leader to bgpids */
+
+/* Take care of system dependencies that must be handled when waiting for
+ children. The arguments to the WAITPID macro match those to the Posix.1
+ waitpid() function. */
+
+#if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION)
+# define WAITPID(pid, statusp, options) \
+ wait3 ((union wait *)statusp, options, (struct rusage *)0)
+#else
+# if defined (_POSIX_VERSION) || defined (HAVE_WAITPID)
+# define WAITPID(pid, statusp, options) \
+ waitpid ((pid_t)pid, statusp, options)
+# else
+# if defined (HAVE_WAIT3)
+# define WAITPID(pid, statusp, options) \
+ wait3 (statusp, options, (struct rusage *)0)
+# else
+# define WAITPID(pid, statusp, options) \
+ wait3 (statusp, options, (int *)0)
+# endif /* HAVE_WAIT3 */
+# endif /* !_POSIX_VERSION && !HAVE_WAITPID*/
+#endif /* !(Ultrix && mips && _POSIX_VERSION) */
+
+/* getpgrp () varies between systems. Even systems that claim to be
+ Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */
+#if defined (GETPGRP_VOID)
+# define getpgid(p) getpgrp ()
+#else
+# define getpgid(p) getpgrp (p)
+#endif /* !GETPGRP_VOID */
+
+/* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the
+ handler for SIGCHLD. */
+#if defined (MUST_REINSTALL_SIGHANDLERS)
+# define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler)
+#else
+# define REINSTALL_SIGCHLD_HANDLER
+#endif /* !MUST_REINSTALL_SIGHANDLERS */
+
+/* Some systems let waitpid(2) tell callers about stopped children. */
+#if !defined (WCONTINUED) || defined (WCONTINUED_BROKEN)
+# undef WCONTINUED
+# define WCONTINUED 0
+#endif
+#if !defined (WIFCONTINUED)
+# define WIFCONTINUED(s) (0)
+#endif
+
+/* The number of additional slots to allocate when we run out. */
+#define JOB_SLOTS 8
+
+typedef int sh_job_map_func_t __P((JOB *, int, int, int));
+
+/* Variables used here but defined in other files. */
+extern int subshell_environment, line_number;
+extern int posixly_correct, shell_level;
+extern int last_command_exit_value, last_command_exit_signal;
+extern int loop_level, breaking;
+extern int executing_list;
+extern int sourcelevel;
+extern int running_trap;
+extern sh_builtin_func_t *this_shell_builtin;
+extern char *shell_name, *this_command_name;
+extern sigset_t top_level_mask;
+extern procenv_t wait_intr_buf;
+extern int wait_signal_received;
+extern WORD_LIST *subst_assign_varlist;
+
+static struct jobstats zerojs = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
+struct jobstats js = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
+
+struct bgpids bgpids = { 0, 0, 0 };
+
+/* The array of known jobs. */
+JOB **jobs = (JOB **)NULL;
+
+#if 0
+/* The number of slots currently allocated to JOBS. */
+int job_slots = 0;
+#endif
+
+/* The controlling tty for this shell. */
+int shell_tty = -1;
+
+/* The shell's process group. */
+pid_t shell_pgrp = NO_PID;
+
+/* The terminal's process group. */
+pid_t terminal_pgrp = NO_PID;
+
+/* The process group of the shell's parent. */
+pid_t original_pgrp = NO_PID;
+
+/* The process group of the pipeline currently being made. */
+pid_t pipeline_pgrp = (pid_t)0;
+
+#if defined (PGRP_PIPE)
+/* Pipes which each shell uses to communicate with the process group leader
+ until all of the processes in a pipeline have been started. Then the
+ process leader is allowed to continue. */
+int pgrp_pipe[2] = { -1, -1 };
+#endif
+
+#if 0
+/* The job which is current; i.e. the one that `%+' stands for. */
+int current_job = NO_JOB;
+
+/* The previous job; i.e. the one that `%-' stands for. */
+int previous_job = NO_JOB;
+#endif
+
+/* Last child made by the shell. */
+pid_t last_made_pid = NO_PID;
+
+/* Pid of the last asynchronous child. */
+pid_t last_asynchronous_pid = NO_PID;
+
+/* The pipeline currently being built. */
+PROCESS *the_pipeline = (PROCESS *)NULL;
+
+/* If this is non-zero, do job control. */
+int job_control = 1;
+
+/* Call this when you start making children. */
+int already_making_children = 0;
+
+/* If this is non-zero, $LINES and $COLUMNS are reset after every process
+ exits from get_tty_state(). */
+int check_window_size = CHECKWINSIZE_DEFAULT;
+
+/* Functions local to this file. */
+
+static sighandler wait_sigint_handler __P((int));
+static sighandler sigchld_handler __P((int));
+static sighandler sigcont_sighandler __P((int));
+static sighandler sigstop_sighandler __P((int));
+
+static int waitchld __P((pid_t, int));
+
+static PROCESS *find_pipeline __P((pid_t, int, int *));
+static PROCESS *find_process __P((pid_t, int, int *));
+
+static char *current_working_directory __P((void));
+static char *job_working_directory __P((void));
+static char *j_strsignal __P((int));
+static char *printable_job_status __P((int, PROCESS *, int));
+
+static PROCESS *find_last_proc __P((int, int));
+static pid_t find_last_pid __P((int, int));
+
+static int set_new_line_discipline __P((int));
+static int map_over_jobs __P((sh_job_map_func_t *, int, int));
+static int job_last_stopped __P((int));
+static int job_last_running __P((int));
+static int most_recent_job_in_state __P((int, JOB_STATE));
+static int find_job __P((pid_t, int, PROCESS **));
+static int print_job __P((JOB *, int, int, int));
+static int process_exit_status __P((WAIT));
+static int process_exit_signal __P((WAIT));
+static int set_job_status_and_cleanup __P((int));
+
+static WAIT job_signal_status __P((int));
+static WAIT raw_job_exit_status __P((int));
+
+static void notify_of_job_status __P((void));
+static void reset_job_indices __P((void));
+static void cleanup_dead_jobs __P((void));
+static int processes_in_job __P((int));
+static void realloc_jobs_list __P((void));
+static int compact_jobs_list __P((int));
+static int discard_pipeline __P((PROCESS *));
+static void add_process __P((char *, pid_t));
+static void print_pipeline __P((PROCESS *, int, int, FILE *));
+static void pretty_print_job __P((int, int, FILE *));
+static void set_current_job __P((int));
+static void reset_current __P((void));
+static void set_job_running __P((int));
+static void setjstatus __P((int));
+static int maybe_give_terminal_to __P((pid_t, pid_t, int));
+static void mark_all_jobs_as_dead __P((void));
+static void mark_dead_jobs_as_notified __P((int));
+static void restore_sigint_handler __P((void));
+#if defined (PGRP_PIPE)
+static void pipe_read __P((int *));
+#endif
+
+static struct pidstat *bgp_alloc __P((pid_t, int));
+static struct pidstat *bgp_add __P((pid_t, int));
+static int bgp_delete __P((pid_t));
+static void bgp_clear __P((void));
+static int bgp_search __P((pid_t));
+static void bgp_prune __P((void));
+
+#if defined (ARRAY_VARS)
+static int *pstatuses; /* list of pipeline statuses */
+static int statsize;
+#endif
+
+/* Used to synchronize between wait_for and other functions and the SIGCHLD
+ signal handler. */
+static int sigchld;
+static int queue_sigchld;
+
+#define QUEUE_SIGCHLD(os) (os) = sigchld, queue_sigchld++
+
+#define UNQUEUE_SIGCHLD(os) \
+ do { \
+ queue_sigchld--; \
+ if (queue_sigchld == 0 && os != sigchld) \
+ waitchld (-1, 0); \
+ } while (0)
+
+static SigHandler *old_tstp, *old_ttou, *old_ttin;
+static SigHandler *old_cont = (SigHandler *)SIG_DFL;
+
+/* A place to temporarily save the current pipeline. */
+static PROCESS *saved_pipeline;
+static int saved_already_making_children;
+
+/* Set this to non-zero whenever you don't want the jobs list to change at
+ all: no jobs deleted and no status change notifications. This is used,
+ for example, when executing SIGCHLD traps, which may run arbitrary
+ commands. */
+static int jobs_list_frozen;
+
+static char retcode_name_buffer[64];
+
+#if !defined (_POSIX_VERSION)
+
+/* These are definitions to map POSIX 1003.1 functions onto existing BSD
+ library functions and system calls. */
+#define setpgid(pid, pgrp) setpgrp (pid, pgrp)
+#define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp))
+
+pid_t
+tcgetpgrp (fd)
+ int fd;
+{
+ pid_t pgrp;
+
+ /* ioctl will handle setting errno correctly. */
+ if (ioctl (fd, TIOCGPGRP, &pgrp) < 0)
+ return (-1);
+ return (pgrp);
+}
+
+#endif /* !_POSIX_VERSION */
+
+/* Initialize the global job stats structure and other bookkeeping variables */
+void
+init_job_stats ()
+{
+ js = zerojs;
+}
+
+/* Return the working directory for the current process. Unlike
+ job_working_directory, this does not call malloc (), nor do any
+ of the functions it calls. This is so that it can safely be called
+ from a signal handler. */
+static char *
+current_working_directory ()
+{
+ char *dir;
+ static char d[PATH_MAX];
+
+ dir = get_string_value ("PWD");
+
+ if (dir == 0 && the_current_working_directory && no_symbolic_links)
+ dir = the_current_working_directory;
+
+ if (dir == 0)
+ {
+ dir = getcwd (d, sizeof(d));
+ if (dir)
+ dir = d;
+ }
+
+ return (dir == 0) ? "<unknown>" : dir;
+}
+
+/* Return the working directory for the current process. */
+static char *
+job_working_directory ()
+{
+ char *dir;
+
+ dir = get_string_value ("PWD");
+ if (dir)
+ return (savestring (dir));
+
+ dir = get_working_directory ("job-working-directory");
+ if (dir)
+ return (dir);
+
+ return (savestring ("<unknown>"));
+}
+
+void
+making_children ()
+{
+ if (already_making_children)
+ return;
+
+ already_making_children = 1;
+ start_pipeline ();
+}
+
+void
+stop_making_children ()
+{
+ already_making_children = 0;
+}
+
+void
+cleanup_the_pipeline ()
+{
+ PROCESS *disposer;
+ sigset_t set, oset;
+
+ BLOCK_CHILD (set, oset);
+ disposer = the_pipeline;
+ the_pipeline = (PROCESS *)NULL;
+ UNBLOCK_CHILD (oset);
+
+ if (disposer)
+ discard_pipeline (disposer);
+}
+
+void
+save_pipeline (clear)
+ int clear;
+{
+ saved_pipeline = the_pipeline;
+ if (clear)
+ the_pipeline = (PROCESS *)NULL;
+ saved_already_making_children = already_making_children;
+}
+
+void
+restore_pipeline (discard)
+ int discard;
+{
+ PROCESS *old_pipeline;
+
+ old_pipeline = the_pipeline;
+ the_pipeline = saved_pipeline;
+ already_making_children = saved_already_making_children;
+ if (discard && old_pipeline)
+ discard_pipeline (old_pipeline);
+}
+
+/* Start building a pipeline. */
+void
+start_pipeline ()
+{
+ if (the_pipeline)
+ {
+ cleanup_the_pipeline ();
+ pipeline_pgrp = 0;
+#if defined (PGRP_PIPE)
+ sh_closepipe (pgrp_pipe);
+#endif
+ }
+
+#if defined (PGRP_PIPE)
+ if (job_control)
+ {
+ if (pipe (pgrp_pipe) == -1)
+ sys_error (_("start_pipeline: pgrp pipe"));
+ }
+#endif
+}
+
+/* Stop building a pipeline. Install the process list in the job array.
+ This returns the index of the newly installed job.
+ DEFERRED is a command structure to be executed upon satisfactory
+ execution exit of this pipeline. */
+int
+stop_pipeline (async, deferred)
+ int async;
+ COMMAND *deferred;
+{
+ register int i, j;
+ JOB *newjob;
+ sigset_t set, oset;
+
+ BLOCK_CHILD (set, oset);
+
+#if defined (PGRP_PIPE)
+ /* The parent closes the process group synchronization pipe. */
+ sh_closepipe (pgrp_pipe);
+#endif
+
+ cleanup_dead_jobs ();
+
+ if (js.j_jobslots == 0)
+ {
+ js.j_jobslots = JOB_SLOTS;
+ jobs = (JOB **)xmalloc (js.j_jobslots * sizeof (JOB *));
+
+ /* Now blank out these new entries. */
+ for (i = 0; i < js.j_jobslots; i++)
+ jobs[i] = (JOB *)NULL;
+
+ js.j_firstj = js.j_lastj = js.j_njobs = 0;
+ }
+
+ /* Scan from the last slot backward, looking for the next free one. */
+ /* XXX - revisit this interactive assumption */
+ /* XXX - this way for now */
+ if (interactive)
+ {
+ for (i = js.j_jobslots; i; i--)
+ if (jobs[i - 1])
+ break;
+ }
+ else
+ {
+#if 0
+ /* This wraps around, but makes it inconvenient to extend the array */
+ for (i = js.j_lastj+1; i != js.j_lastj; i++)
+ {
+ if (i >= js.j_jobslots)
+ i = 0;
+ if (jobs[i] == 0)
+ break;
+ }
+ if (i == js.j_lastj)
+ i = js.j_jobslots;
+#else
+ /* This doesn't wrap around yet. */
+ for (i = js.j_lastj ? js.j_lastj + 1 : js.j_lastj; i < js.j_jobslots; i++)
+ if (jobs[i] == 0)
+ break;
+#endif
+ }
+
+ /* Do we need more room? */
+
+ /* First try compaction */
+ if ((interactive_shell == 0 || subshell_environment) && i == js.j_jobslots && js.j_jobslots >= MAX_JOBS_IN_ARRAY)
+ i = compact_jobs_list (0);
+
+ /* If we can't compact, reallocate */
+ if (i == js.j_jobslots)
+ {
+ js.j_jobslots += JOB_SLOTS;
+ jobs = (JOB **)xrealloc (jobs, (js.j_jobslots * sizeof (JOB *)));
+
+ for (j = i; j < js.j_jobslots; j++)
+ jobs[j] = (JOB *)NULL;
+ }
+
+ /* Add the current pipeline to the job list. */
+ if (the_pipeline)
+ {
+ register PROCESS *p;
+ int any_running, any_stopped, n;
+
+ newjob = (JOB *)xmalloc (sizeof (JOB));
+
+ for (n = 1, p = the_pipeline; p->next != the_pipeline; n++, p = p->next)
+ ;
+ p->next = (PROCESS *)NULL;
+ newjob->pipe = REVERSE_LIST (the_pipeline, PROCESS *);
+ for (p = newjob->pipe; p->next; p = p->next)
+ ;
+ p->next = newjob->pipe;
+
+ the_pipeline = (PROCESS *)NULL;
+ newjob->pgrp = pipeline_pgrp;
+ pipeline_pgrp = 0;
+
+ newjob->flags = 0;
+
+ /* Flag to see if in another pgrp. */
+ if (job_control)
+ newjob->flags |= J_JOBCONTROL;
+
+ /* Set the state of this pipeline. */
+ p = newjob->pipe;
+ any_running = any_stopped = 0;
+ do
+ {
+ any_running |= PRUNNING (p);
+ any_stopped |= PSTOPPED (p);
+ p = p->next;
+ }
+ while (p != newjob->pipe);
+
+ newjob->state = any_running ? JRUNNING : (any_stopped ? JSTOPPED : JDEAD);
+ newjob->wd = job_working_directory ();
+ newjob->deferred = deferred;
+
+ newjob->j_cleanup = (sh_vptrfunc_t *)NULL;
+ newjob->cleanarg = (PTR_T) NULL;
+
+ jobs[i] = newjob;
+ if (newjob->state == JDEAD && (newjob->flags & J_FOREGROUND))
+ setjstatus (i);
+ if (newjob->state == JDEAD)
+ {
+ js.c_reaped += n; /* wouldn't have been done since this was not part of a job */
+ js.j_ndead++;
+ }
+ js.c_injobs += n;
+
+ js.j_lastj = i;
+ js.j_njobs++;
+ }
+ else
+ newjob = (JOB *)NULL;
+
+ if (newjob)
+ js.j_lastmade = newjob;
+
+ if (async)
+ {
+ if (newjob)
+ {
+ newjob->flags &= ~J_FOREGROUND;
+ newjob->flags |= J_ASYNC;
+ js.j_lastasync = newjob;
+ }
+ reset_current ();
+ }
+ else
+ {
+ if (newjob)
+ {
+ newjob->flags |= J_FOREGROUND;
+ /*
+ * !!!!! NOTE !!!!! (chet@ins.cwru.edu)
+ *
+ * The currently-accepted job control wisdom says to set the
+ * terminal's process group n+1 times in an n-step pipeline:
+ * once in the parent and once in each child. This is where
+ * the parent gives it away.
+ *
+ * Don't give the terminal away if this shell is an asynchronous
+ * subshell.
+ *
+ */
+ if (job_control && newjob->pgrp && (subshell_environment&SUBSHELL_ASYNC) == 0)
+ maybe_give_terminal_to (shell_pgrp, newjob->pgrp, 0);
+ }
+ }
+
+ stop_making_children ();
+ UNBLOCK_CHILD (oset);
+ return (newjob ? i : js.j_current);
+}
+
+/* Functions to manage the list of exited background pids whose status has
+ been saved. */
+
+static struct pidstat *
+bgp_alloc (pid, status)
+ pid_t pid;
+ int status;
+{
+ struct pidstat *ps;
+
+ ps = (struct pidstat *)xmalloc (sizeof (struct pidstat));
+ ps->pid = pid;
+ ps->status = status;
+ ps->next = (struct pidstat *)0;
+ return ps;
+}
+
+static struct pidstat *
+bgp_add (pid, status)
+ pid_t pid;
+ int status;
+{
+ struct pidstat *ps;
+
+ ps = bgp_alloc (pid, status);
+
+ if (bgpids.list == 0)
+ {
+ bgpids.list = bgpids.end = ps;
+ bgpids.npid = 0; /* just to make sure */
+ }
+ else
+ {
+ bgpids.end->next = ps;
+ bgpids.end = ps;
+ }
+ bgpids.npid++;
+
+ if (bgpids.npid > js.c_childmax)
+ bgp_prune ();
+
+ return ps;
+}
+
+static int
+bgp_delete (pid)
+ pid_t pid;
+{
+ struct pidstat *prev, *p;
+
+ for (prev = p = bgpids.list; p; prev = p, p = p->next)
+ if (p->pid == pid)
+ {
+ prev->next = p->next; /* remove from list */
+ break;
+ }
+
+ if (p == 0)
+ return 0; /* not found */
+
+#if defined (DEBUG)
+ itrace("bgp_delete: deleting %d", pid);
+#endif
+
+ /* Housekeeping in the border cases. */
+ if (p == bgpids.list)
+ bgpids.list = bgpids.list->next;
+ else if (p == bgpids.end)
+ bgpids.end = prev;
+
+ bgpids.npid--;
+ if (bgpids.npid == 0)
+ bgpids.list = bgpids.end = 0;
+ else if (bgpids.npid == 1)
+ bgpids.end = bgpids.list; /* just to make sure */
+
+ free (p);
+ return 1;
+}
+
+/* Clear out the list of saved statuses */
+static void
+bgp_clear ()
+{
+ struct pidstat *ps, *p;
+
+ for (ps = bgpids.list; ps; )
+ {
+ p = ps;
+ ps = ps->next;
+ free (p);
+ }
+ bgpids.list = bgpids.end = 0;
+ bgpids.npid = 0;
+}
+
+/* Search for PID in the list of saved background pids; return its status if
+ found. If not found, return -1. */
+static int
+bgp_search (pid)
+ pid_t pid;
+{
+ struct pidstat *ps;
+
+ for (ps = bgpids.list ; ps; ps = ps->next)
+ if (ps->pid == pid)
+ return ps->status;
+ return -1;
+}
+
+static void
+bgp_prune ()
+{
+ struct pidstat *ps;
+
+ while (bgpids.npid > js.c_childmax)
+ {
+ ps = bgpids.list;
+ bgpids.list = bgpids.list->next;
+ free (ps);
+ bgpids.npid--;
+ }
+}
+
+/* Reset the values of js.j_lastj and js.j_firstj after one or both have
+ been deleted. The caller should check whether js.j_njobs is 0 before
+ calling this. This wraps around, but the rest of the code does not. At
+ this point, it should not matter. */
+static void
+reset_job_indices ()
+{
+ int old;
+
+ if (jobs[js.j_firstj] == 0)
+ {
+ old = js.j_firstj++;
+ if (old >= js.j_jobslots)
+ old = js.j_jobslots - 1;
+ while (js.j_firstj != old)
+ {
+ if (js.j_firstj >= js.j_jobslots)
+ js.j_firstj = 0;
+ if (jobs[js.j_firstj] || js.j_firstj == old) /* needed if old == 0 */
+ break;
+ js.j_firstj++;
+ }
+ if (js.j_firstj == old)
+ js.j_firstj = js.j_lastj = js.j_njobs = 0;
+ }
+ if (jobs[js.j_lastj] == 0)
+ {
+ old = js.j_lastj--;
+ if (old < 0)
+ old = 0;
+ while (js.j_lastj != old)
+ {
+ if (js.j_lastj < 0)
+ js.j_lastj = js.j_jobslots - 1;
+ if (jobs[js.j_lastj] || js.j_lastj == old) /* needed if old == js.j_jobslots */
+ break;
+ js.j_lastj--;
+ }
+ if (js.j_lastj == old)
+ js.j_firstj = js.j_lastj = js.j_njobs = 0;
+ }
+}
+
+/* Delete all DEAD jobs that the user had received notification about. */
+static void
+cleanup_dead_jobs ()
+{
+ register int i;
+ int os;
+
+ if (js.j_jobslots == 0 || jobs_list_frozen)
+ return;
+
+ QUEUE_SIGCHLD(os);
+
+ /* XXX could use js.j_firstj and js.j_lastj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ {
+#if defined (DEBUG)
+ if (i < js.j_firstj && jobs[i])
+ itrace("cleanup_dead_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
+ if (i > js.j_lastj && jobs[i])
+ itrace("cleanup_dead_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
+#endif
+
+ if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i))
+ delete_job (i, 0);
+ }
+
+#if defined (COPROCESS_SUPPORT)
+ coproc_reap ();
+#endif
+
+ UNQUEUE_SIGCHLD(os);
+}
+
+static int
+processes_in_job (job)
+ int job;
+{
+ int nproc;
+ register PROCESS *p;
+
+ nproc = 0;
+ p = jobs[job]->pipe;
+ do
+ {
+ p = p->next;
+ nproc++;
+ }
+ while (p != jobs[job]->pipe);
+
+ return nproc;
+}
+
+static void
+delete_old_job (pid)
+ pid_t pid;
+{
+ PROCESS *p;
+ int job;
+
+ job = find_job (pid, 0, &p);
+ if (job != NO_JOB)
+ {
+#ifdef DEBUG
+ itrace ("delete_old_job: found pid %d in job %d with state %d", pid, job, jobs[job]->state);
+#endif
+ if (JOBSTATE (job) == JDEAD)
+ delete_job (job, DEL_NOBGPID);
+ else
+ {
+ internal_warning (_("forked pid %d appears in running job %d"), pid, job);
+ if (p)
+ p->pid = 0;
+ }
+ }
+}
+
+/* Reallocate and compress the jobs list. This returns with a jobs array
+ whose size is a multiple of JOB_SLOTS and can hold the current number of
+ jobs. Heuristics are used to minimize the number of new reallocs. */
+static void
+realloc_jobs_list ()
+{
+ sigset_t set, oset;
+ int nsize, i, j, ncur, nprev;
+ JOB **nlist;
+
+ ncur = nprev = NO_JOB;
+ nsize = ((js.j_njobs + JOB_SLOTS - 1) / JOB_SLOTS);
+ nsize *= JOB_SLOTS;
+ i = js.j_njobs % JOB_SLOTS;
+ if (i == 0 || i > (JOB_SLOTS >> 1))
+ nsize += JOB_SLOTS;
+
+ BLOCK_CHILD (set, oset);
+ nlist = (js.j_jobslots == nsize) ? jobs : (JOB **) xmalloc (nsize * sizeof (JOB *));
+
+ js.c_reaped = js.j_ndead = 0;
+ for (i = j = 0; i < js.j_jobslots; i++)
+ if (jobs[i])
+ {
+ if (i == js.j_current)
+ ncur = j;
+ if (i == js.j_previous)
+ nprev = j;
+ nlist[j++] = jobs[i];
+ if (jobs[i]->state == JDEAD)
+ {
+ js.j_ndead++;
+ js.c_reaped += processes_in_job (i);
+ }
+ }
+
+#if defined (DEBUG)
+ itrace ("realloc_jobs_list: resize jobs list from %d to %d", js.j_jobslots, nsize);
+ itrace ("realloc_jobs_list: j_lastj changed from %d to %d", js.j_lastj, (j > 0) ? j - 1 : 0);
+ itrace ("realloc_jobs_list: j_njobs changed from %d to %d", js.j_njobs, j);
+ itrace ("realloc_jobs_list: js.j_ndead %d js.c_reaped %d", js.j_ndead, js.c_reaped);
+#endif
+
+ js.j_firstj = 0;
+ js.j_lastj = (j > 0) ? j - 1 : 0;
+ js.j_njobs = j;
+ js.j_jobslots = nsize;
+
+ /* Zero out remaining slots in new jobs list */
+ for ( ; j < nsize; j++)
+ nlist[j] = (JOB *)NULL;
+
+ if (jobs != nlist)
+ {
+ free (jobs);
+ jobs = nlist;
+ }
+
+ if (ncur != NO_JOB)
+ js.j_current = ncur;
+ if (nprev != NO_JOB)
+ js.j_previous = nprev;
+
+ /* Need to reset these */
+ if (js.j_current == NO_JOB || js.j_previous == NO_JOB || js.j_current > js.j_lastj || js.j_previous > js.j_lastj)
+ reset_current ();
+
+#ifdef DEBUG
+ itrace ("realloc_jobs_list: reset js.j_current (%d) and js.j_previous (%d)", js.j_current, js.j_previous);
+#endif
+
+ UNBLOCK_CHILD (oset);
+}
+
+/* Compact the jobs list by removing dead jobs. Assumed that we have filled
+ the jobs array to some predefined maximum. Called when the shell is not
+ the foreground process (subshell_environment != 0). Returns the first
+ available slot in the compacted list. If that value is js.j_jobslots, then
+ the list needs to be reallocated. The jobs array may be in new memory if
+ this returns > 0 and < js.j_jobslots. FLAGS is reserved for future use. */
+static int
+compact_jobs_list (flags)
+ int flags;
+{
+ if (js.j_jobslots == 0 || jobs_list_frozen)
+ return js.j_jobslots;
+
+ reap_dead_jobs ();
+ realloc_jobs_list ();
+
+#ifdef DEBUG
+ itrace("compact_jobs_list: returning %d", (js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0);
+#endif
+
+ return ((js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0);
+}
+
+/* Delete the job at INDEX from the job list. Must be called
+ with SIGCHLD blocked. */
+void
+delete_job (job_index, dflags)
+ int job_index, dflags;
+{
+ register JOB *temp;
+ PROCESS *proc;
+ int ndel;
+
+ if (js.j_jobslots == 0 || jobs_list_frozen)
+ return;
+
+ if ((dflags & DEL_WARNSTOPPED) && subshell_environment == 0 && STOPPED (job_index))
+ internal_warning (_("deleting stopped job %d with process group %ld"), job_index+1, (long)jobs[job_index]->pgrp);
+ temp = jobs[job_index];
+ if (temp == 0)
+ return;
+
+ if ((dflags & DEL_NOBGPID) == 0)
+ {
+ proc = find_last_proc (job_index, 0);
+ /* Could do this just for J_ASYNC jobs, but we save all. */
+ if (proc)
+ bgp_add (proc->pid, process_exit_status (proc->status));
+ }
+
+ jobs[job_index] = (JOB *)NULL;
+ if (temp == js.j_lastmade)
+ js.j_lastmade = 0;
+ else if (temp == js.j_lastasync)
+ js.j_lastasync = 0;
+
+ free (temp->wd);
+ ndel = discard_pipeline (temp->pipe);
+
+ js.c_injobs -= ndel;
+ if (temp->state == JDEAD)
+ {
+ js.c_reaped -= ndel;
+ js.j_ndead--;
+ if (js.c_reaped < 0)
+ {
+#ifdef DEBUG
+ itrace("delete_job (%d pgrp %d): js.c_reaped (%d) < 0 ndel = %d js.j_ndead = %d", job_index, temp->pgrp, js.c_reaped, ndel, js.j_ndead);
+#endif
+ js.c_reaped = 0;
+ }
+ }
+
+ if (temp->deferred)
+ dispose_command (temp->deferred);
+
+ free (temp);
+
+ js.j_njobs--;
+ if (js.j_njobs == 0)
+ js.j_firstj = js.j_lastj = 0;
+ else if (jobs[js.j_firstj] == 0 || jobs[js.j_lastj] == 0)
+ reset_job_indices ();
+
+ if (job_index == js.j_current || job_index == js.j_previous)
+ reset_current ();
+}
+
+/* Must be called with SIGCHLD blocked. */
+void
+nohup_job (job_index)
+ int job_index;
+{
+ register JOB *temp;
+
+ if (js.j_jobslots == 0)
+ return;
+
+ if (temp = jobs[job_index])
+ temp->flags |= J_NOHUP;
+}
+
+/* Get rid of the data structure associated with a process chain. */
+static int
+discard_pipeline (chain)
+ register PROCESS *chain;
+{
+ register PROCESS *this, *next;
+ int n;
+
+ this = chain;
+ n = 0;
+ do
+ {
+ next = this->next;
+ FREE (this->command);
+ free (this);
+ n++;
+ this = next;
+ }
+ while (this != chain);
+
+ return n;
+}
+
+/* Add this process to the chain being built in the_pipeline.
+ NAME is the command string that will be exec'ed later.
+ PID is the process id of the child. */
+static void
+add_process (name, pid)
+ char *name;
+ pid_t pid;
+{
+ PROCESS *t, *p;
+
+#if defined (RECYCLES_PIDS)
+ int j;
+ p = find_process (pid, 0, &j);
+ if (p)
+ {
+# ifdef DEBUG
+ if (j == NO_JOB)
+ internal_warning (_("add_process: process %5ld (%s) in the_pipeline"), (long)p->pid, p->command);
+# endif
+ if (PALIVE (p))
+ internal_warning (_("add_process: pid %5ld (%s) marked as still alive"), (long)p->pid, p->command);
+ p->running = PS_RECYCLED; /* mark as recycled */
+ }
+#endif
+
+ t = (PROCESS *)xmalloc (sizeof (PROCESS));
+ t->next = the_pipeline;
+ t->pid = pid;
+ WSTATUS (t->status) = 0;
+ t->running = PS_RUNNING;
+ t->command = name;
+ the_pipeline = t;
+
+ if (t->next == 0)
+ t->next = t;
+ else
+ {
+ p = t->next;
+ while (p->next != t->next)
+ p = p->next;
+ p->next = t;
+ }
+}
+
+/* Create a (dummy) PROCESS with NAME, PID, and STATUS, and make it the last
+ process in jobs[JID]->pipe. Used by the lastpipe code. */
+void
+append_process (name, pid, status, jid)
+ char *name;
+ pid_t pid;
+ int status;
+ int jid;
+{
+ PROCESS *t, *p;
+
+ t = (PROCESS *)xmalloc (sizeof (PROCESS));
+ t->next = (PROCESS *)NULL;
+ t->pid = pid;
+ /* set process exit status using offset discovered by configure */
+ t->status = (status & 0xff) << WEXITSTATUS_OFFSET;
+ t->running = PS_DONE;
+ t->command = name;
+
+ js.c_reaped++; /* XXX */
+
+ for (p = jobs[jid]->pipe; p->next != jobs[jid]->pipe; p = p->next)
+ ;
+ p->next = t;
+ t->next = jobs[jid]->pipe;
+}
+
+#if 0
+/* Take the last job and make it the first job. Must be called with
+ SIGCHLD blocked. */
+int
+rotate_the_pipeline ()
+{
+ PROCESS *p;
+
+ if (the_pipeline->next == the_pipeline)
+ return;
+ for (p = the_pipeline; p->next != the_pipeline; p = p->next)
+ ;
+ the_pipeline = p;
+}
+
+/* Reverse the order of the processes in the_pipeline. Must be called with
+ SIGCHLD blocked. */
+int
+reverse_the_pipeline ()
+{
+ PROCESS *p, *n;
+
+ if (the_pipeline->next == the_pipeline)
+ return;
+
+ for (p = the_pipeline; p->next != the_pipeline; p = p->next)
+ ;
+ p->next = (PROCESS *)NULL;
+
+ n = REVERSE_LIST (the_pipeline, PROCESS *);
+
+ the_pipeline = n;
+ for (p = the_pipeline; p->next; p = p->next)
+ ;
+ p->next = the_pipeline;
+}
+#endif
+
+/* Map FUNC over the list of jobs. If FUNC returns non-zero,
+ then it is time to stop mapping, and that is the return value
+ for map_over_jobs. FUNC is called with a JOB, arg1, arg2,
+ and INDEX. */
+static int
+map_over_jobs (func, arg1, arg2)
+ sh_job_map_func_t *func;
+ int arg1, arg2;
+{
+ register int i;
+ int result;
+ sigset_t set, oset;
+
+ if (js.j_jobslots == 0)
+ return 0;
+
+ BLOCK_CHILD (set, oset);
+
+ /* XXX could use js.j_firstj here */
+ for (i = result = 0; i < js.j_jobslots; i++)
+ {
+#if defined (DEBUG)
+ if (i < js.j_firstj && jobs[i])
+ itrace("map_over_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
+ if (i > js.j_lastj && jobs[i])
+ itrace("map_over_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
+#endif
+ if (jobs[i])
+ {
+ result = (*func)(jobs[i], arg1, arg2, i);
+ if (result)
+ break;
+ }
+ }
+
+ UNBLOCK_CHILD (oset);
+
+ return (result);
+}
+
+/* Cause all the jobs in the current pipeline to exit. */
+void
+terminate_current_pipeline ()
+{
+ if (pipeline_pgrp && pipeline_pgrp != shell_pgrp)
+ {
+ killpg (pipeline_pgrp, SIGTERM);
+ killpg (pipeline_pgrp, SIGCONT);
+ }
+}
+
+/* Cause all stopped jobs to exit. */
+void
+terminate_stopped_jobs ()
+{
+ register int i;
+
+ /* XXX could use js.j_firstj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ {
+ if (jobs[i] && STOPPED (i))
+ {
+ killpg (jobs[i]->pgrp, SIGTERM);
+ killpg (jobs[i]->pgrp, SIGCONT);
+ }
+ }
+}
+
+/* Cause all jobs, running or stopped, to receive a hangup signal. If
+ a job is marked J_NOHUP, don't send the SIGHUP. */
+void
+hangup_all_jobs ()
+{
+ register int i;
+
+ /* XXX could use js.j_firstj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ {
+ if (jobs[i])
+ {
+ if (jobs[i]->flags & J_NOHUP)
+ continue;
+ killpg (jobs[i]->pgrp, SIGHUP);
+ if (STOPPED (i))
+ killpg (jobs[i]->pgrp, SIGCONT);
+ }
+ }
+}
+
+void
+kill_current_pipeline ()
+{
+ stop_making_children ();
+ start_pipeline ();
+}
+
+/* Return the pipeline that PID belongs to. Note that the pipeline
+ doesn't have to belong to a job. Must be called with SIGCHLD blocked.
+ If JOBP is non-null, return the index of the job containing PID. */
+static PROCESS *
+find_pipeline (pid, alive_only, jobp)
+ pid_t pid;
+ int alive_only;
+ int *jobp; /* index into jobs list or NO_JOB */
+{
+ int job;
+ PROCESS *p;
+
+ /* See if this process is in the pipeline that we are building. */
+ if (jobp)
+ *jobp = NO_JOB;
+ if (the_pipeline)
+ {
+ p = the_pipeline;
+ do
+ {
+ /* Return it if we found it. Don't ever return a recycled pid. */
+ if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p)))
+ return (p);
+
+ p = p->next;
+ }
+ while (p != the_pipeline);
+ }
+
+ job = find_job (pid, alive_only, &p);
+ if (jobp)
+ *jobp = job;
+ return (job == NO_JOB) ? (PROCESS *)NULL : jobs[job]->pipe;
+}
+
+/* Return the PROCESS * describing PID. If JOBP is non-null return the index
+ into the jobs array of the job containing PID. Must be called with
+ SIGCHLD blocked. */
+static PROCESS *
+find_process (pid, alive_only, jobp)
+ pid_t pid;
+ int alive_only;
+ int *jobp; /* index into jobs list or NO_JOB */
+{
+ PROCESS *p;
+
+ p = find_pipeline (pid, alive_only, jobp);
+ while (p && p->pid != pid)
+ p = p->next;
+ return p;
+}
+
+/* Return the job index that PID belongs to, or NO_JOB if it doesn't
+ belong to any job. Must be called with SIGCHLD blocked. */
+static int
+find_job (pid, alive_only, procp)
+ pid_t pid;
+ int alive_only;
+ PROCESS **procp;
+{
+ register int i;
+ PROCESS *p;
+
+ /* XXX could use js.j_firstj here, and should check js.j_lastj */
+ for (i = 0; i < js.j_jobslots; i++)
+ {
+#if defined (DEBUG)
+ if (i < js.j_firstj && jobs[i])
+ itrace("find_job: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
+ if (i > js.j_lastj && jobs[i])
+ itrace("find_job: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
+#endif
+ if (jobs[i])
+ {
+ p = jobs[i]->pipe;
+
+ do
+ {
+ if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p)))
+ {
+ if (procp)
+ *procp = p;
+ return (i);
+ }
+
+ p = p->next;
+ }
+ while (p != jobs[i]->pipe);
+ }
+ }
+
+ return (NO_JOB);
+}
+
+/* Find a job given a PID. If BLOCK is non-zero, block SIGCHLD as
+ required by find_job. */
+int
+get_job_by_pid (pid, block)
+ pid_t pid;
+ int block;
+{
+ int job;
+ sigset_t set, oset;
+
+ if (block)
+ BLOCK_CHILD (set, oset);
+
+ job = find_job (pid, 0, NULL);
+
+ if (block)
+ UNBLOCK_CHILD (oset);
+
+ return job;
+}
+
+/* Print descriptive information about the job with leader pid PID. */
+void
+describe_pid (pid)
+ pid_t pid;
+{
+ int job;
+ sigset_t set, oset;
+
+ BLOCK_CHILD (set, oset);
+
+ job = find_job (pid, 0, NULL);
+
+ if (job != NO_JOB)
+ fprintf (stderr, "[%d] %ld\n", job + 1, (long)pid);
+ else
+ programming_error (_("describe_pid: %ld: no such pid"), (long)pid);
+
+ UNBLOCK_CHILD (oset);
+}
+
+static char *
+j_strsignal (s)
+ int s;
+{
+ char *x;
+
+ x = strsignal (s);
+ if (x == 0)
+ {
+ x = retcode_name_buffer;
+ sprintf (x, _("Signal %d"), s);
+ }
+ return x;
+}
+
+static char *
+printable_job_status (j, p, format)
+ int j;
+ PROCESS *p;
+ int format;
+{
+ static char *temp;
+ int es;
+
+ temp = _("Done");
+
+ if (STOPPED (j) && format == 0)
+ {
+ if (posixly_correct == 0 || p == 0 || (WIFSTOPPED (p->status) == 0))
+ temp = _("Stopped");
+ else
+ {
+ temp = retcode_name_buffer;
+ sprintf (temp, _("Stopped(%s)"), signal_name (WSTOPSIG (p->status)));
+ }
+ }
+ else if (RUNNING (j))
+ temp = _("Running");
+ else
+ {
+ if (WIFSTOPPED (p->status))
+ temp = j_strsignal (WSTOPSIG (p->status));
+ else if (WIFSIGNALED (p->status))
+ temp = j_strsignal (WTERMSIG (p->status));
+ else if (WIFEXITED (p->status))
+ {
+ temp = retcode_name_buffer;
+ es = WEXITSTATUS (p->status);
+ if (es == 0)
+ strcpy (temp, _("Done"));
+ else if (posixly_correct)
+ sprintf (temp, _("Done(%d)"), es);
+ else
+ sprintf (temp, _("Exit %d"), es);
+ }
+ else
+ temp = _("Unknown status");
+ }
+
+ return temp;
+}
+
+/* This is the way to print out information on a job if you
+ know the index. FORMAT is:
+
+ JLIST_NORMAL) [1]+ Running emacs
+ JLIST_LONG ) [1]+ 2378 Running emacs
+ -1 ) [1]+ 2378 emacs
+
+ JLIST_NORMAL) [1]+ Stopped ls | more
+ JLIST_LONG ) [1]+ 2369 Stopped ls
+ 2367 | more
+ JLIST_PID_ONLY)
+ Just list the pid of the process group leader (really
+ the process group).
+ JLIST_CHANGED_ONLY)
+ Use format JLIST_NORMAL, but list only jobs about which
+ the user has not been notified. */
+
+/* Print status for pipeline P. If JOB_INDEX is >= 0, it is the index into
+ the JOBS array corresponding to this pipeline. FORMAT is as described
+ above. Must be called with SIGCHLD blocked.
+
+ If you're printing a pipeline that's not in the jobs array, like the
+ current pipeline as it's being created, pass -1 for JOB_INDEX */
+static void
+print_pipeline (p, job_index, format, stream)
+ PROCESS *p;
+ int job_index, format;
+ FILE *stream;
+{
+ PROCESS *first, *last, *show;
+ int es, name_padding;
+ char *temp;
+
+ if (p == 0)
+ return;
+
+ first = last = p;
+ while (last->next != first)
+ last = last->next;
+
+ for (;;)
+ {
+ if (p != first)
+ fprintf (stream, format ? " " : " |");
+
+ if (format != JLIST_STANDARD)
+ fprintf (stream, "%5ld", (long)p->pid);
+
+ fprintf (stream, " ");
+
+ if (format > -1 && job_index >= 0)
+ {
+ show = format ? p : last;
+ temp = printable_job_status (job_index, show, format);
+
+ if (p != first)
+ {
+ if (format)
+ {
+ if (show->running == first->running &&
+ WSTATUS (show->status) == WSTATUS (first->status))
+ temp = "";
+ }
+ else
+ temp = (char *)NULL;
+ }
+
+ if (temp)
+ {
+ fprintf (stream, "%s", temp);
+
+ es = STRLEN (temp);
+ if (es == 0)
+ es = 2; /* strlen ("| ") */
+ name_padding = LONGEST_SIGNAL_DESC - es;
+
+ fprintf (stream, "%*s", name_padding, "");
+
+ if ((WIFSTOPPED (show->status) == 0) &&
+ (WIFCONTINUED (show->status) == 0) &&
+ WIFCORED (show->status))
+ fprintf (stream, _("(core dumped) "));
+ }
+ }
+
+ if (p != first && format)
+ fprintf (stream, "| ");
+
+ if (p->command)
+ fprintf (stream, "%s", p->command);
+
+ if (p == last && job_index >= 0)
+ {
+ temp = current_working_directory ();
+
+ if (RUNNING (job_index) && (IS_FOREGROUND (job_index) == 0))
+ fprintf (stream, " &");
+
+ if (strcmp (temp, jobs[job_index]->wd) != 0)
+ fprintf (stream,
+ _(" (wd: %s)"), polite_directory_format (jobs[job_index]->wd));
+ }
+
+ if (format || (p == last))
+ {
+ /* We need to add a CR only if this is an interactive shell, and
+ we're reporting the status of a completed job asynchronously.
+ We can't really check whether this particular job is being
+ reported asynchronously, so just add the CR if the shell is
+ currently interactive and asynchronous notification is enabled. */
+ if (asynchronous_notification && interactive)
+ fprintf (stream, "\r\n");
+ else
+ fprintf (stream, "\n");
+ }
+
+ if (p == last)
+ break;
+ p = p->next;
+ }
+ fflush (stream);
+}
+
+/* Print information to STREAM about jobs[JOB_INDEX] according to FORMAT.
+ Must be called with SIGCHLD blocked or queued with queue_sigchld */
+static void
+pretty_print_job (job_index, format, stream)
+ int job_index, format;
+ FILE *stream;
+{
+ register PROCESS *p;
+
+ /* Format only pid information about the process group leader? */
+ if (format == JLIST_PID_ONLY)
+ {
+ fprintf (stream, "%ld\n", (long)jobs[job_index]->pipe->pid);
+ return;
+ }
+
+ if (format == JLIST_CHANGED_ONLY)
+ {
+ if (IS_NOTIFIED (job_index))
+ return;
+ format = JLIST_STANDARD;
+ }
+
+ if (format != JLIST_NONINTERACTIVE)
+ fprintf (stream, "[%d]%c ", job_index + 1,
+ (job_index == js.j_current) ? '+':
+ (job_index == js.j_previous) ? '-' : ' ');
+
+ if (format == JLIST_NONINTERACTIVE)
+ format = JLIST_LONG;
+
+ p = jobs[job_index]->pipe;
+
+ print_pipeline (p, job_index, format, stream);
+
+ /* We have printed information about this job. When the job's
+ status changes, waitchld () sets the notification flag to 0. */
+ jobs[job_index]->flags |= J_NOTIFIED;
+}
+
+static int
+print_job (job, format, state, job_index)
+ JOB *job;
+ int format, state, job_index;
+{
+ if (state == -1 || (JOB_STATE)state == job->state)
+ pretty_print_job (job_index, format, stdout);
+ return (0);
+}
+
+void
+list_one_job (job, format, ignore, job_index)
+ JOB *job;
+ int format, ignore, job_index;
+{
+ pretty_print_job (job_index, format, stdout);
+}
+
+void
+list_stopped_jobs (format)
+ int format;
+{
+ cleanup_dead_jobs ();
+ map_over_jobs (print_job, format, (int)JSTOPPED);
+}
+
+void
+list_running_jobs (format)
+ int format;
+{
+ cleanup_dead_jobs ();
+ map_over_jobs (print_job, format, (int)JRUNNING);
+}
+
+/* List jobs. If FORMAT is non-zero, then the long form of the information
+ is printed, else just a short version. */
+void
+list_all_jobs (format)
+ int format;
+{
+ cleanup_dead_jobs ();
+ map_over_jobs (print_job, format, -1);
+}
+
+/* Fork, handling errors. Returns the pid of the newly made child, or 0.
+ COMMAND is just for remembering the name of the command; we don't do
+ anything else with it. ASYNC_P says what to do with the tty. If
+ non-zero, then don't give it away. */
+pid_t
+make_child (command, async_p)
+ char *command;
+ int async_p;
+{
+ int forksleep;
+ sigset_t set, oset;
+ pid_t pid;
+
+ sigemptyset (&set);
+ sigaddset (&set, SIGCHLD);
+ sigaddset (&set, SIGINT);
+ sigemptyset (&oset);
+ sigprocmask (SIG_BLOCK, &set, &oset);
+
+ making_children ();
+
+ forksleep = 1;
+
+#if defined (BUFFERED_INPUT)
+ /* If default_buffered_input is active, we are reading a script. If
+ the command is asynchronous, we have already duplicated /dev/null
+ as fd 0, but have not changed the buffered stream corresponding to
+ the old fd 0. We don't want to sync the stream in this case. */
+ if (default_buffered_input != -1 &&
+ (!async_p || default_buffered_input > 0))
+ sync_buffered_stream (default_buffered_input);
+#endif /* BUFFERED_INPUT */
+
+ /* Create the child, handle severe errors. Retry on EAGAIN. */
+ while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX)
+ {
+ /* bash-4.2 */
+ /* If we can't create any children, try to reap some dead ones. */
+ waitchld (-1, 0);
+
+ sys_error ("fork: retry");
+ if (sleep (forksleep) != 0)
+ break;
+ forksleep <<= 1;
+ }
+
+ if (pid < 0)
+ {
+ sys_error ("fork");
+
+ /* Kill all of the processes in the current pipeline. */
+ terminate_current_pipeline ();
+
+ /* Discard the current pipeline, if any. */
+ if (the_pipeline)
+ kill_current_pipeline ();
+
+ last_command_exit_value = EX_NOEXEC;
+ throw_to_top_level (); /* Reset signals, etc. */
+ }
+
+ if (pid == 0)
+ {
+ /* In the child. Give this child the right process group, set the
+ signals to the default state for a new process. */
+ pid_t mypid;
+
+ mypid = getpid ();
+#if defined (BUFFERED_INPUT)
+ /* Close default_buffered_input if it's > 0. We don't close it if it's
+ 0 because that's the file descriptor used when redirecting input,
+ and it's wrong to close the file in that case. */
+ unset_bash_input (0);
+#endif /* BUFFERED_INPUT */
+
+ /* Restore top-level signal mask. */
+ sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
+
+ if (job_control)
+ {
+ /* All processes in this pipeline belong in the same
+ process group. */
+
+ if (pipeline_pgrp == 0) /* This is the first child. */
+ pipeline_pgrp = mypid;
+
+ /* Check for running command in backquotes. */
+ if (pipeline_pgrp == shell_pgrp)
+ ignore_tty_job_signals ();
+ else
+ default_tty_job_signals ();
+
+ /* Set the process group before trying to mess with the terminal's
+ process group. This is mandated by POSIX. */
+ /* This is in accordance with the Posix 1003.1 standard,
+ section B.7.2.4, which says that trying to set the terminal
+ process group with tcsetpgrp() to an unused pgrp value (like
+ this would have for the first child) is an error. Section
+ B.4.3.3, p. 237 also covers this, in the context of job control
+ shells. */
+ if (setpgid (mypid, pipeline_pgrp) < 0)
+ sys_error (_("child setpgid (%ld to %ld)"), (long)mypid, (long)pipeline_pgrp);
+
+ /* By convention (and assumption above), if
+ pipeline_pgrp == shell_pgrp, we are making a child for
+ command substitution.
+ In this case, we don't want to give the terminal to the
+ shell's process group (we could be in the middle of a
+ pipeline, for example). */
+ if (async_p == 0 && pipeline_pgrp != shell_pgrp && ((subshell_environment&SUBSHELL_ASYNC) == 0))
+ give_terminal_to (pipeline_pgrp, 0);
+
+#if defined (PGRP_PIPE)
+ if (pipeline_pgrp == mypid)
+ pipe_read (pgrp_pipe);
+#endif
+ }
+ else /* Without job control... */
+ {
+ if (pipeline_pgrp == 0)
+ pipeline_pgrp = shell_pgrp;
+
+ /* If these signals are set to SIG_DFL, we encounter the curious
+ situation of an interactive ^Z to a running process *working*
+ and stopping the process, but being unable to do anything with
+ that process to change its state. On the other hand, if they
+ are set to SIG_IGN, jobs started from scripts do not stop when
+ the shell running the script gets a SIGTSTP and stops. */
+
+ default_tty_job_signals ();
+ }
+
+#if defined (PGRP_PIPE)
+ /* Release the process group pipe, since our call to setpgid ()
+ is done. The last call to sh_closepipe is done in stop_pipeline. */
+ sh_closepipe (pgrp_pipe);
+#endif /* PGRP_PIPE */
+
+#if 0
+ /* Don't set last_asynchronous_pid in the child */
+ if (async_p)
+ last_asynchronous_pid = mypid; /* XXX */
+ else
+#endif
+#if defined (RECYCLES_PIDS)
+ if (last_asynchronous_pid == mypid)
+ /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
+ last_asynchronous_pid = 1;
+#endif
+ }
+ else
+ {
+ /* In the parent. Remember the pid of the child just created
+ as the proper pgrp if this is the first child. */
+
+ if (job_control)
+ {
+ if (pipeline_pgrp == 0)
+ {
+ pipeline_pgrp = pid;
+ /* Don't twiddle terminal pgrps in the parent! This is the bug,
+ not the good thing of twiddling them in the child! */
+ /* give_terminal_to (pipeline_pgrp, 0); */
+ }
+ /* This is done on the recommendation of the Rationale section of
+ the POSIX 1003.1 standard, where it discusses job control and
+ shells. It is done to avoid possible race conditions. (Ref.
+ 1003.1 Rationale, section B.4.3.3, page 236). */
+ setpgid (pid, pipeline_pgrp);
+ }
+ else
+ {
+ if (pipeline_pgrp == 0)
+ pipeline_pgrp = shell_pgrp;
+ }
+
+ /* Place all processes into the jobs array regardless of the
+ state of job_control. */
+ add_process (command, pid);
+
+ if (async_p)
+ last_asynchronous_pid = pid;
+#if defined (RECYCLES_PIDS)
+ else if (last_asynchronous_pid == pid)
+ /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
+ last_asynchronous_pid = 1;
+#endif
+
+ /* Delete the saved status for any job containing this PID in case it's
+ been reused. */
+ delete_old_job (pid);
+
+ /* Perform the check for pid reuse unconditionally. Some systems reuse
+ PIDs before giving a process CHILD_MAX/_SC_CHILD_MAX unique ones. */
+ bgp_delete (pid); /* new process, discard any saved status */
+
+ last_made_pid = pid;
+
+ /* keep stats */
+ js.c_totforked++;
+ js.c_living++;
+
+ /* Unblock SIGINT and SIGCHLD unless creating a pipeline, in which case
+ SIGCHLD remains blocked until all commands in the pipeline have been
+ created. */
+ sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
+ }
+
+ return (pid);
+}
+
+/* These two functions are called only in child processes. */
+void
+ignore_tty_job_signals ()
+{
+ set_signal_handler (SIGTSTP, SIG_IGN);
+ set_signal_handler (SIGTTIN, SIG_IGN);
+ set_signal_handler (SIGTTOU, SIG_IGN);
+}
+
+void
+default_tty_job_signals ()
+{
+ set_signal_handler (SIGTSTP, SIG_DFL);
+ set_signal_handler (SIGTTIN, SIG_DFL);
+ set_signal_handler (SIGTTOU, SIG_DFL);
+}
+
+/* When we end a job abnormally, or if we stop a job, we set the tty to the
+ state kept in here. When a job ends normally, we set the state in here
+ to the state of the tty. */
+
+static TTYSTRUCT shell_tty_info;
+
+#if defined (NEW_TTY_DRIVER)
+static struct tchars shell_tchars;
+static struct ltchars shell_ltchars;
+#endif /* NEW_TTY_DRIVER */
+
+#if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT)
+/* Since the BSD tty driver does not allow us to change the tty modes
+ while simultaneously waiting for output to drain and preserving
+ typeahead, we have to drain the output ourselves before calling
+ ioctl. We cheat by finding the length of the output queue, and
+ using select to wait for an appropriate length of time. This is
+ a hack, and should be labeled as such (it's a hastily-adapted
+ mutation of a `usleep' implementation). It's only reason for
+ existing is the flaw in the BSD tty driver. */
+
+static int ttspeeds[] =
+{
+ 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
+ 1800, 2400, 4800, 9600, 19200, 38400
+};
+
+static void
+draino (fd, ospeed)
+ int fd, ospeed;
+{
+ register int delay = ttspeeds[ospeed];
+ int n;
+
+ if (!delay)
+ return;
+
+ while ((ioctl (fd, TIOCOUTQ, &n) == 0) && n)
+ {
+ if (n > (delay / 100))
+ {
+ struct timeval tv;
+
+ n *= 10; /* 2 bits more for conservativeness. */
+ tv.tv_sec = n / delay;
+ tv.tv_usec = ((n % delay) * 1000000) / delay;
+ select (fd, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
+ }
+ else
+ break;
+ }
+}
+#endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */
+
+/* Return the fd from which we are actually getting input. */
+#define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
+
+/* Fill the contents of shell_tty_info with the current tty info. */
+int
+get_tty_state ()
+{
+ int tty;
+
+ tty = input_tty ();
+ if (tty != -1)
+ {
+#if defined (NEW_TTY_DRIVER)
+ ioctl (tty, TIOCGETP, &shell_tty_info);
+ ioctl (tty, TIOCGETC, &shell_tchars);
+ ioctl (tty, TIOCGLTC, &shell_ltchars);
+#endif /* NEW_TTY_DRIVER */
+
+#if defined (TERMIO_TTY_DRIVER)
+ ioctl (tty, TCGETA, &shell_tty_info);
+#endif /* TERMIO_TTY_DRIVER */
+
+#if defined (TERMIOS_TTY_DRIVER)
+ if (tcgetattr (tty, &shell_tty_info) < 0)
+ {
+#if 0
+ /* Only print an error message if we're really interactive at
+ this time. */
+ if (interactive)
+ sys_error ("[%ld: %d (%d)] tcgetattr", (long)getpid (), shell_level, tty);
+#endif
+ return -1;
+ }
+#endif /* TERMIOS_TTY_DRIVER */
+ if (check_window_size)
+ get_new_window_size (0, (int *)0, (int *)0);
+ }
+ return 0;
+}
+
+/* Make the current tty use the state in shell_tty_info. */
+int
+set_tty_state ()
+{
+ int tty;
+
+ tty = input_tty ();
+ if (tty != -1)
+ {
+#if defined (NEW_TTY_DRIVER)
+# if defined (DRAIN_OUTPUT)
+ draino (tty, shell_tty_info.sg_ospeed);
+# endif /* DRAIN_OUTPUT */
+ ioctl (tty, TIOCSETN, &shell_tty_info);
+ ioctl (tty, TIOCSETC, &shell_tchars);
+ ioctl (tty, TIOCSLTC, &shell_ltchars);
+#endif /* NEW_TTY_DRIVER */
+
+#if defined (TERMIO_TTY_DRIVER)
+ ioctl (tty, TCSETAW, &shell_tty_info);
+#endif /* TERMIO_TTY_DRIVER */
+
+#if defined (TERMIOS_TTY_DRIVER)
+ if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0)
+ {
+ /* Only print an error message if we're really interactive at
+ this time. */
+ if (interactive)
+ sys_error ("[%ld: %d (%d)] tcsetattr", (long)getpid (), shell_level, tty);
+ return -1;
+ }
+#endif /* TERMIOS_TTY_DRIVER */
+ }
+ return 0;
+}
+
+/* Given an index into the jobs array JOB, return the PROCESS struct of the last
+ process in that job's pipeline. This is the one whose exit status
+ counts. Must be called with SIGCHLD blocked or queued. */
+static PROCESS *
+find_last_proc (job, block)
+ int job;
+ int block;
+{
+ register PROCESS *p;
+ sigset_t set, oset;
+
+ if (block)
+ BLOCK_CHILD (set, oset);
+
+ p = jobs[job]->pipe;
+ while (p && p->next != jobs[job]->pipe)
+ p = p->next;
+
+ if (block)
+ UNBLOCK_CHILD (oset);
+
+ return (p);
+}
+
+static pid_t
+find_last_pid (job, block)
+ int job;
+ int block;
+{
+ PROCESS *p;
+
+ p = find_last_proc (job, block);
+ /* Possible race condition here. */
+ return p->pid;
+}
+
+/* Wait for a particular child of the shell to finish executing.
+ This low-level function prints an error message if PID is not
+ a child of this shell. It returns -1 if it fails, or whatever
+ wait_for returns otherwise. If the child is not found in the
+ jobs table, it returns 127. */
+int
+wait_for_single_pid (pid)
+ pid_t pid;
+{
+ register PROCESS *child;
+ sigset_t set, oset;
+ int r, job;
+
+ BLOCK_CHILD (set, oset);
+ child = find_pipeline (pid, 0, (int *)NULL);
+ UNBLOCK_CHILD (oset);
+
+ if (child == 0)
+ {
+ r = bgp_search (pid);
+ if (r >= 0)
+ return r;
+ }
+
+ if (child == 0)
+ {
+ internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid);
+ return (127);
+ }
+
+ r = wait_for (pid);
+
+ /* POSIX.2: if we just waited for a job, we can remove it from the jobs
+ table. */
+ BLOCK_CHILD (set, oset);
+ job = find_job (pid, 0, NULL);
+ if (job != NO_JOB && jobs[job] && DEADJOB (job))
+ jobs[job]->flags |= J_NOTIFIED;
+ UNBLOCK_CHILD (oset);
+
+ /* If running in posix mode, remove the job from the jobs table immediately */
+ if (posixly_correct)
+ {
+ cleanup_dead_jobs ();
+ bgp_delete (pid);
+ }
+
+ return r;
+}
+
+/* Wait for all of the background processes started by this shell to finish. */
+void
+wait_for_background_pids ()
+{
+ register int i, r, waited_for;
+ sigset_t set, oset;
+ pid_t pid;
+
+ for (waited_for = 0;;)
+ {
+ BLOCK_CHILD (set, oset);
+
+ /* find first running job; if none running in foreground, break */
+ /* XXX could use js.j_firstj and js.j_lastj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ {
+#if defined (DEBUG)
+ if (i < js.j_firstj && jobs[i])
+ itrace("wait_for_background_pids: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
+ if (i > js.j_lastj && jobs[i])
+ itrace("wait_for_background_pids: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
+#endif
+ if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0)
+ break;
+ }
+ if (i == js.j_jobslots)
+ {
+ UNBLOCK_CHILD (oset);
+ break;
+ }
+
+ /* now wait for the last pid in that job. */
+ pid = find_last_pid (i, 0);
+ UNBLOCK_CHILD (oset);
+ QUIT;
+ errno = 0; /* XXX */
+ r = wait_for_single_pid (pid);
+ if (r == -1)
+ {
+ /* If we're mistaken about job state, compensate. */
+ if (errno == ECHILD)
+ mark_all_jobs_as_dead ();
+ }
+ else
+ waited_for++;
+ }
+
+ /* POSIX.2 says the shell can discard the statuses of all completed jobs if
+ `wait' is called with no arguments. */
+ mark_dead_jobs_as_notified (1);
+ cleanup_dead_jobs ();
+ bgp_clear ();
+}
+
+/* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
+#define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
+static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER;
+
+static int wait_sigint_received;
+static int child_caught_sigint;
+static int waiting_for_child;
+
+static void
+restore_sigint_handler ()
+{
+ if (old_sigint_handler != INVALID_SIGNAL_HANDLER)
+ {
+ set_signal_handler (SIGINT, old_sigint_handler);
+ old_sigint_handler = INVALID_SIGNAL_HANDLER;
+ waiting_for_child = 0;
+ }
+}
+
+/* Handle SIGINT while we are waiting for children in a script to exit.
+ The `wait' builtin should be interruptible, but all others should be
+ effectively ignored (i.e. not cause the shell to exit). */
+static sighandler
+wait_sigint_handler (sig)
+ int sig;
+{
+ SigHandler *sigint_handler;
+
+ if (interrupt_immediately ||
+ (this_shell_builtin && this_shell_builtin == wait_builtin))
+ {
+ last_command_exit_value = 128+SIGINT;
+ restore_sigint_handler ();
+ /* If we got a SIGINT while in `wait', and SIGINT is trapped, do
+ what POSIX.2 says (see builtins/wait.def for more info). */
+ if (this_shell_builtin && this_shell_builtin == wait_builtin &&
+ signal_is_trapped (SIGINT) &&
+ ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler))
+ {
+ trap_handler (SIGINT); /* set pending_traps[SIGINT] */
+ wait_signal_received = SIGINT;
+ if (interrupt_immediately)
+ {
+ interrupt_immediately = 0;
+ longjmp (wait_intr_buf, 1);
+ }
+ else
+ /* Let CHECK_WAIT_INTR handle it in wait_for/waitchld */
+ SIGRETURN (0);
+ }
+ else if (interrupt_immediately)
+ {
+ ADDINTERRUPT;
+ QUIT;
+ }
+ else /* wait_builtin but signal not trapped, treat as interrupt */
+ kill (getpid (), SIGINT);
+ }
+
+ /* XXX - should this be interrupt_state? If it is, the shell will act
+ as if it got the SIGINT interrupt. */
+ if (waiting_for_child)
+ wait_sigint_received = 1;
+ else
+ {
+ last_command_exit_value = 128+SIGINT;
+ restore_sigint_handler ();
+ kill (getpid (), SIGINT);
+ }
+
+ /* Otherwise effectively ignore the SIGINT and allow the running job to
+ be killed. */
+ SIGRETURN (0);
+}
+
+static int
+process_exit_signal (status)
+ WAIT status;
+{
+ return (WIFSIGNALED (status) ? WTERMSIG (status) : 0);
+}
+
+static int
+process_exit_status (status)
+ WAIT status;
+{
+ if (WIFSIGNALED (status))
+ return (128 + WTERMSIG (status));
+ else if (WIFSTOPPED (status) == 0)
+ return (WEXITSTATUS (status));
+ else
+ return (EXECUTION_SUCCESS);
+}
+
+static WAIT
+job_signal_status (job)
+ int job;
+{
+ register PROCESS *p;
+ WAIT s;
+
+ p = jobs[job]->pipe;
+ do
+ {
+ s = p->status;
+ if (WIFSIGNALED(s) || WIFSTOPPED(s))
+ break;
+ p = p->next;
+ }
+ while (p != jobs[job]->pipe);
+
+ return s;
+}
+
+/* Return the exit status of the last process in the pipeline for job JOB.
+ This is the exit status of the entire job. */
+static WAIT
+raw_job_exit_status (job)
+ int job;
+{
+ register PROCESS *p;
+ int fail;
+ WAIT ret;
+
+ if (pipefail_opt)
+ {
+ fail = 0;
+ p = jobs[job]->pipe;
+ do
+ {
+ if (WSTATUS (p->status) != EXECUTION_SUCCESS)
+ fail = WSTATUS(p->status);
+ p = p->next;
+ }
+ while (p != jobs[job]->pipe);
+ WSTATUS (ret) = fail;
+ return ret;
+ }
+
+ for (p = jobs[job]->pipe; p->next != jobs[job]->pipe; p = p->next)
+ ;
+ return (p->status);
+}
+
+/* Return the exit status of job JOB. This is the exit status of the last
+ (rightmost) process in the job's pipeline, modified if the job was killed
+ by a signal or stopped. */
+int
+job_exit_status (job)
+ int job;
+{
+ return (process_exit_status (raw_job_exit_status (job)));
+}
+
+int
+job_exit_signal (job)
+ int job;
+{
+ return (process_exit_signal (raw_job_exit_status (job)));
+}
+
+#define FIND_CHILD(pid, child) \
+ do \
+ { \
+ child = find_pipeline (pid, 0, (int *)NULL); \
+ if (child == 0) \
+ { \
+ give_terminal_to (shell_pgrp, 0); \
+ UNBLOCK_CHILD (oset); \
+ internal_error (_("wait_for: No record of process %ld"), (long)pid); \
+ restore_sigint_handler (); \
+ return (termination_state = 127); \
+ } \
+ } \
+ while (0)
+
+/* Wait for pid (one of our children) to terminate, then
+ return the termination state. Returns 127 if PID is not found in
+ the jobs table. Returns -1 if waitchld() returns -1, indicating
+ that there are no unwaited-for child processes. */
+int
+wait_for (pid)
+ pid_t pid;
+{
+ int job, termination_state, r;
+ WAIT s;
+ register PROCESS *child;
+ sigset_t set, oset;
+
+ /* In the case that this code is interrupted, and we longjmp () out of it,
+ we are relying on the code in throw_to_top_level () to restore the
+ top-level signal mask. */
+ BLOCK_CHILD (set, oset);
+
+ /* Ignore interrupts while waiting for a job run without job control
+ to finish. We don't want the shell to exit if an interrupt is
+ received, only if one of the jobs run is killed via SIGINT. If
+ job control is not set, the job will be run in the same pgrp as
+ the shell, and the shell will see any signals the job gets. In
+ fact, we want this set every time the waiting shell and the waited-
+ for process are in the same process group, including command
+ substitution. */
+
+ /* This is possibly a race condition -- should it go in stop_pipeline? */
+ wait_sigint_received = child_caught_sigint = 0;
+ if (job_control == 0 || (subshell_environment&SUBSHELL_COMSUB))
+ {
+ old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler);
+ waiting_for_child = 0;
+ if (old_sigint_handler == SIG_IGN)
+ set_signal_handler (SIGINT, old_sigint_handler);
+ }
+
+ termination_state = last_command_exit_value;
+
+ if (interactive && job_control == 0)
+ QUIT;
+ /* Check for terminating signals and exit the shell if we receive one */
+ CHECK_TERMSIG;
+
+ /* Check for a trapped signal interrupting the wait builtin and jump out */
+ CHECK_WAIT_INTR;
+
+ /* If we say wait_for (), then we have a record of this child somewhere.
+ If it and none of its peers are running, don't call waitchld(). */
+
+ job = NO_JOB;
+ do
+ {
+ FIND_CHILD (pid, child);
+
+ /* If this child is part of a job, then we are really waiting for the
+ job to finish. Otherwise, we are waiting for the child to finish.
+ We check for JDEAD in case the job state has been set by waitchld
+ after receipt of a SIGCHLD. */
+ if (job == NO_JOB)
+ job = find_job (pid, 0, NULL);
+
+ /* waitchld() takes care of setting the state of the job. If the job
+ has already exited before this is called, sigchld_handler will have
+ called waitchld and the state will be set to JDEAD. */
+
+ if (PRUNNING(child) || (job != NO_JOB && RUNNING (job)))
+ {
+#if defined (WAITPID_BROKEN) /* SCOv4 */
+ sigset_t suspend_set;
+ sigemptyset (&suspend_set);
+ sigsuspend (&suspend_set);
+#else /* !WAITPID_BROKEN */
+# if defined (MUST_UNBLOCK_CHLD)
+ struct sigaction act, oact;
+ sigset_t nullset, chldset;
+
+ sigemptyset (&nullset);
+ sigemptyset (&chldset);
+ sigprocmask (SIG_SETMASK, &nullset, &chldset);
+ act.sa_handler = SIG_DFL;
+ sigemptyset (&act.sa_mask);
+ sigemptyset (&oact.sa_mask);
+ act.sa_flags = 0;
+ sigaction (SIGCHLD, &act, &oact);
+# endif
+ queue_sigchld = 1;
+ waiting_for_child++;
+ r = waitchld (pid, 1);
+ waiting_for_child--;
+# if defined (MUST_UNBLOCK_CHLD)
+ sigaction (SIGCHLD, &oact, (struct sigaction *)NULL);
+ sigprocmask (SIG_SETMASK, &chldset, (sigset_t *)NULL);
+# endif
+ queue_sigchld = 0;
+ if (r == -1 && errno == ECHILD && this_shell_builtin == wait_builtin)
+ {
+ termination_state = -1;
+ goto wait_for_return;
+ }
+
+ /* If child is marked as running, but waitpid() returns -1/ECHILD,
+ there is something wrong. Somewhere, wait should have returned
+ that child's pid. Mark the child as not running and the job,
+ if it exists, as JDEAD. */
+ if (r == -1 && errno == ECHILD)
+ {
+ child->running = PS_DONE;
+ WSTATUS (child->status) = 0; /* XXX -- can't find true status */
+ js.c_living = 0; /* no living child processes */
+ if (job != NO_JOB)
+ {
+ jobs[job]->state = JDEAD;
+ js.c_reaped++;
+ js.j_ndead++;
+ }
+ }
+#endif /* WAITPID_BROKEN */
+ }
+
+ /* If the shell is interactive, and job control is disabled, see
+ if the foreground process has died due to SIGINT and jump out
+ of the wait loop if it has. waitchld has already restored the
+ old SIGINT signal handler. */
+ if (interactive && job_control == 0)
+ QUIT;
+ /* Check for terminating signals and exit the shell if we receive one */
+ CHECK_TERMSIG;
+
+ /* Check for a trapped signal interrupting the wait builtin and jump out */
+ CHECK_WAIT_INTR;
+ }
+ while (PRUNNING (child) || (job != NO_JOB && RUNNING (job)));
+
+ /* Restore the original SIGINT signal handler before we return. */
+ restore_sigint_handler ();
+
+ /* The exit state of the command is either the termination state of the
+ child, or the termination state of the job. If a job, the status
+ of the last child in the pipeline is the significant one. If the command
+ or job was terminated by a signal, note that value also. */
+ termination_state = (job != NO_JOB) ? job_exit_status (job)
+ : process_exit_status (child->status);
+ last_command_exit_signal = (job != NO_JOB) ? job_exit_signal (job)
+ : process_exit_signal (child->status);
+
+ /* XXX */
+ if ((job != NO_JOB && JOBSTATE (job) == JSTOPPED) || WIFSTOPPED (child->status))
+ termination_state = 128 + WSTOPSIG (child->status);
+
+ if (job == NO_JOB || IS_JOBCONTROL (job))
+ {
+ /* XXX - under what circumstances is a job not present in the jobs
+ table (job == NO_JOB)?
+ 1. command substitution
+
+ In the case of command substitution, at least, it's probably not
+ the right thing to give the terminal to the shell's process group,
+ even though there is code in subst.c:command_substitute to work
+ around it.
+
+ Things that don't:
+ $PROMPT_COMMAND execution
+ process substitution
+ */
+#if 0
+if (job == NO_JOB)
+ itrace("wait_for: job == NO_JOB, giving the terminal to shell_pgrp (%ld)", (long)shell_pgrp);
+#endif
+ give_terminal_to (shell_pgrp, 0);
+ }
+
+ /* If the command did not exit cleanly, or the job is just
+ being stopped, then reset the tty state back to what it
+ was before this command. Reset the tty state and notify
+ the user of the job termination only if the shell is
+ interactive. Clean up any dead jobs in either case. */
+ if (job != NO_JOB)
+ {
+ if (interactive_shell && subshell_environment == 0)
+ {
+ /* This used to use `child->status'. That's wrong, however, for
+ pipelines. `child' is the first process in the pipeline. It's
+ likely that the process we want to check for abnormal termination
+ or stopping is the last process in the pipeline, especially if
+ it's long-lived and the first process is short-lived. Since we
+ know we have a job here, we can check all the processes in this
+ job's pipeline and see if one of them stopped or terminated due
+ to a signal. We might want to change this later to just check
+ the last process in the pipeline. If no process exits due to a
+ signal, S is left as the status of the last job in the pipeline. */
+ s = job_signal_status (job);
+
+ if (WIFSIGNALED (s) || WIFSTOPPED (s))
+ {
+ set_tty_state ();
+
+ /* If the current job was stopped or killed by a signal, and
+ the user has requested it, get a possibly new window size */
+ if (check_window_size && (job == js.j_current || IS_FOREGROUND (job)))
+ get_new_window_size (0, (int *)0, (int *)0);
+ }
+ else
+ get_tty_state ();
+
+ /* If job control is enabled, the job was started with job
+ control, the job was the foreground job, and it was killed
+ by SIGINT, then print a newline to compensate for the kernel
+ printing the ^C without a trailing newline. */
+ if (job_control && IS_JOBCONTROL (job) && IS_FOREGROUND (job) &&
+ WIFSIGNALED (s) && WTERMSIG (s) == SIGINT)
+ {
+ /* If SIGINT is not trapped and the shell is in a for, while,
+ or until loop, act as if the shell received SIGINT as
+ well, so the loop can be broken. This doesn't call the
+ SIGINT signal handler; maybe it should. */
+ if (signal_is_trapped (SIGINT) == 0 && (loop_level || (shell_compatibility_level > 32 && executing_list)))
+ ADDINTERRUPT;
+ else
+ {
+ putchar ('\n');
+ fflush (stdout);
+ }
+ }
+ }
+ else if ((subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PIPE)) && wait_sigint_received)
+ {
+ /* If waiting for a job in a subshell started to do command
+ substitution or to run a pipeline element that consists of
+ something like a while loop or a for loop, simulate getting
+ and being killed by the SIGINT to pass the status back to our
+ parent. */
+ s = job_signal_status (job);
+
+ if (child_caught_sigint == 0 && signal_is_trapped (SIGINT) == 0)
+ {
+ UNBLOCK_CHILD (oset);
+ old_sigint_handler = set_signal_handler (SIGINT, SIG_DFL);
+ if (old_sigint_handler == SIG_IGN)
+ restore_sigint_handler ();
+ else
+ kill (getpid (), SIGINT);
+ }
+ }
+ else if (interactive_shell == 0 && IS_FOREGROUND (job) && check_window_size)
+ get_new_window_size (0, (int *)0, (int *)0);
+
+ /* Moved here from set_job_status_and_cleanup, which is in the SIGCHLD
+ signal handler path */
+ if (DEADJOB (job) && IS_FOREGROUND (job) /*&& subshell_environment == 0*/)
+ setjstatus (job);
+
+ /* If this job is dead, notify the user of the status. If the shell
+ is interactive, this will display a message on the terminal. If
+ the shell is not interactive, make sure we turn on the notify bit
+ so we don't get an unwanted message about the job's termination,
+ and so delete_job really clears the slot in the jobs table. */
+ notify_and_cleanup ();
+ }
+
+wait_for_return:
+
+ UNBLOCK_CHILD (oset);
+
+ return (termination_state);
+}
+
+/* Wait for the last process in the pipeline for JOB. Returns whatever
+ wait_for returns: the last process's termination state or -1 if there
+ are no unwaited-for child processes or an error occurs. */
+int
+wait_for_job (job)
+ int job;
+{
+ pid_t pid;
+ int r;
+ sigset_t set, oset;
+
+ BLOCK_CHILD(set, oset);
+ if (JOBSTATE (job) == JSTOPPED)
+ internal_warning (_("wait_for_job: job %d is stopped"), job+1);
+
+ pid = find_last_pid (job, 0);
+ UNBLOCK_CHILD(oset);
+ r = wait_for (pid);
+
+ /* POSIX.2: we can remove the job from the jobs table if we just waited
+ for it. */
+ BLOCK_CHILD (set, oset);
+ if (job != NO_JOB && jobs[job] && DEADJOB (job))
+ jobs[job]->flags |= J_NOTIFIED;
+ UNBLOCK_CHILD (oset);
+
+ return r;
+}
+
+/* Print info about dead jobs, and then delete them from the list
+ of known jobs. This does not actually delete jobs when the
+ shell is not interactive, because the dead jobs are not marked
+ as notified. */
+void
+notify_and_cleanup ()
+{
+ if (jobs_list_frozen)
+ return;
+
+ if (interactive || interactive_shell == 0 || sourcelevel)
+ notify_of_job_status ();
+
+ cleanup_dead_jobs ();
+}
+
+/* Make dead jobs disappear from the jobs array without notification.
+ This is used when the shell is not interactive. */
+void
+reap_dead_jobs ()
+{
+ mark_dead_jobs_as_notified (0);
+ cleanup_dead_jobs ();
+}
+
+/* Return the next closest (chronologically) job to JOB which is in
+ STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if
+ there is no next recent job. */
+static int
+most_recent_job_in_state (job, state)
+ int job;
+ JOB_STATE state;
+{
+ register int i, result;
+ sigset_t set, oset;
+
+ BLOCK_CHILD (set, oset);
+
+ for (result = NO_JOB, i = job - 1; i >= 0; i--)
+ {
+ if (jobs[i] && (JOBSTATE (i) == state))
+ {
+ result = i;
+ break;
+ }
+ }
+
+ UNBLOCK_CHILD (oset);
+
+ return (result);
+}
+
+/* Return the newest *stopped* job older than JOB, or NO_JOB if not
+ found. */
+static int
+job_last_stopped (job)
+ int job;
+{
+ return (most_recent_job_in_state (job, JSTOPPED));
+}
+
+/* Return the newest *running* job older than JOB, or NO_JOB if not
+ found. */
+static int
+job_last_running (job)
+ int job;
+{
+ return (most_recent_job_in_state (job, JRUNNING));
+}
+
+/* Make JOB be the current job, and make previous be useful. Must be
+ called with SIGCHLD blocked. */
+static void
+set_current_job (job)
+ int job;
+{
+ int candidate;
+
+ if (js.j_current != job)
+ {
+ js.j_previous = js.j_current;
+ js.j_current = job;
+ }
+
+ /* First choice for previous job is the old current job. */
+ if (js.j_previous != js.j_current &&
+ js.j_previous != NO_JOB &&
+ jobs[js.j_previous] &&
+ STOPPED (js.j_previous))
+ return;
+
+ /* Second choice: Newest stopped job that is older than
+ the current job. */
+ candidate = NO_JOB;
+ if (STOPPED (js.j_current))
+ {
+ candidate = job_last_stopped (js.j_current);
+
+ if (candidate != NO_JOB)
+ {
+ js.j_previous = candidate;
+ return;
+ }
+ }
+
+ /* If we get here, there is either only one stopped job, in which case it is
+ the current job and the previous job should be set to the newest running
+ job, or there are only running jobs and the previous job should be set to
+ the newest running job older than the current job. We decide on which
+ alternative to use based on whether or not JOBSTATE(js.j_current) is
+ JSTOPPED. */
+
+ candidate = RUNNING (js.j_current) ? job_last_running (js.j_current)
+ : job_last_running (js.j_jobslots);
+
+ if (candidate != NO_JOB)
+ {
+ js.j_previous = candidate;
+ return;
+ }
+
+ /* There is only a single job, and it is both `+' and `-'. */
+ js.j_previous = js.j_current;
+}
+
+/* Make current_job be something useful, if it isn't already. */
+
+/* Here's the deal: The newest non-running job should be `+', and the
+ next-newest non-running job should be `-'. If there is only a single
+ stopped job, the js.j_previous is the newest non-running job. If there
+ are only running jobs, the newest running job is `+' and the
+ next-newest running job is `-'. Must be called with SIGCHLD blocked. */
+
+static void
+reset_current ()
+{
+ int candidate;
+
+ if (js.j_jobslots && js.j_current != NO_JOB && jobs[js.j_current] && STOPPED (js.j_current))
+ candidate = js.j_current;
+ else
+ {
+ candidate = NO_JOB;
+
+ /* First choice: the previous job. */
+ if (js.j_previous != NO_JOB && jobs[js.j_previous] && STOPPED (js.j_previous))
+ candidate = js.j_previous;
+
+ /* Second choice: the most recently stopped job. */
+ if (candidate == NO_JOB)
+ candidate = job_last_stopped (js.j_jobslots);
+
+ /* Third choice: the newest running job. */
+ if (candidate == NO_JOB)
+ candidate = job_last_running (js.j_jobslots);
+ }
+
+ /* If we found a job to use, then use it. Otherwise, there
+ are no jobs period. */
+ if (candidate != NO_JOB)
+ set_current_job (candidate);
+ else
+ js.j_current = js.j_previous = NO_JOB;
+}
+
+/* Set up the job structures so we know the job and its processes are
+ all running. */
+static void
+set_job_running (job)
+ int job;
+{
+ register PROCESS *p;
+
+ /* Each member of the pipeline is now running. */
+ p = jobs[job]->pipe;
+
+ do
+ {
+ if (WIFSTOPPED (p->status))
+ p->running = PS_RUNNING; /* XXX - could be PS_STOPPED */
+ p = p->next;
+ }
+ while (p != jobs[job]->pipe);
+
+ /* This means that the job is running. */
+ JOBSTATE (job) = JRUNNING;
+}
+
+/* Start a job. FOREGROUND if non-zero says to do that. Otherwise,
+ start the job in the background. JOB is a zero-based index into
+ JOBS. Returns -1 if it is unable to start a job, and the return
+ status of the job otherwise. */
+int
+start_job (job, foreground)
+ int job, foreground;
+{
+ register PROCESS *p;
+ int already_running;
+ sigset_t set, oset;
+ char *wd, *s;
+ static TTYSTRUCT save_stty;
+
+ BLOCK_CHILD (set, oset);
+
+ if (DEADJOB (job))
+ {
+ internal_error (_("%s: job has terminated"), this_command_name);
+ UNBLOCK_CHILD (oset);
+ return (-1);
+ }
+
+ already_running = RUNNING (job);
+
+ if (foreground == 0 && already_running)
+ {
+ internal_error (_("%s: job %d already in background"), this_command_name, job + 1);
+ UNBLOCK_CHILD (oset);
+ return (0); /* XPG6/SUSv3 says this is not an error */
+ }
+
+ wd = current_working_directory ();
+
+ /* You don't know about the state of this job. Do you? */
+ jobs[job]->flags &= ~J_NOTIFIED;
+
+ if (foreground)
+ {
+ set_current_job (job);
+ jobs[job]->flags |= J_FOREGROUND;
+ }
+
+ /* Tell the outside world what we're doing. */
+ p = jobs[job]->pipe;
+
+ if (foreground == 0)
+ {
+ /* POSIX.2 says `bg' doesn't give any indication about current or
+ previous job. */
+ if (posixly_correct == 0)
+ s = (job == js.j_current) ? "+ ": ((job == js.j_previous) ? "- " : " ");
+ else
+ s = " ";
+ printf ("[%d]%s", job + 1, s);
+ }
+
+ do
+ {
+ printf ("%s%s",
+ p->command ? p->command : "",
+ p->next != jobs[job]->pipe? " | " : "");
+ p = p->next;
+ }
+ while (p != jobs[job]->pipe);
+
+ if (foreground == 0)
+ printf (" &");
+
+ if (strcmp (wd, jobs[job]->wd) != 0)
+ printf (" (wd: %s)", polite_directory_format (jobs[job]->wd));
+
+ printf ("\n");
+
+ /* Run the job. */
+ if (already_running == 0)
+ set_job_running (job);
+
+ /* Save the tty settings before we start the job in the foreground. */
+ if (foreground)
+ {
+ get_tty_state ();
+ save_stty = shell_tty_info;
+ /* Give the terminal to this job. */
+ if (IS_JOBCONTROL (job))
+ give_terminal_to (jobs[job]->pgrp, 0);
+ }
+ else
+ jobs[job]->flags &= ~J_FOREGROUND;
+
+ /* If the job is already running, then don't bother jump-starting it. */
+ if (already_running == 0)
+ {
+ jobs[job]->flags |= J_NOTIFIED;
+ killpg (jobs[job]->pgrp, SIGCONT);
+ }
+
+ if (foreground)
+ {
+ pid_t pid;
+ int st;
+
+ pid = find_last_pid (job, 0);
+ UNBLOCK_CHILD (oset);
+ st = wait_for (pid);
+ shell_tty_info = save_stty;
+ set_tty_state ();
+ return (st);
+ }
+ else
+ {
+ reset_current ();
+ UNBLOCK_CHILD (oset);
+ return (0);
+ }
+}
+
+/* Give PID SIGNAL. This determines what job the pid belongs to (if any).
+ If PID does belong to a job, and the job is stopped, then CONTinue the
+ job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null,
+ then kill the process group associated with PID. */
+int
+kill_pid (pid, sig, group)
+ pid_t pid;
+ int sig, group;
+{
+ register PROCESS *p;
+ int job, result, negative;
+ sigset_t set, oset;
+
+ if (pid < -1)
+ {
+ pid = -pid;
+ group = negative = 1;
+ }
+ else
+ negative = 0;
+
+ result = EXECUTION_SUCCESS;
+ if (group)
+ {
+ BLOCK_CHILD (set, oset);
+ p = find_pipeline (pid, 0, &job);
+
+ if (job != NO_JOB)
+ {
+ jobs[job]->flags &= ~J_NOTIFIED;
+
+ /* Kill process in backquotes or one started without job control? */
+
+ /* If we're passed a pid < -1, just call killpg and see what happens */
+ if (negative && jobs[job]->pgrp == shell_pgrp)
+ result = killpg (pid, sig);
+ /* If we're killing using job control notification, for example,
+ without job control active, we have to do things ourselves. */
+ else if (jobs[job]->pgrp == shell_pgrp)
+ {
+ p = jobs[job]->pipe;
+ do
+ {
+ if (PALIVE (p) == 0)
+ continue; /* avoid pid recycling problem */
+ kill (p->pid, sig);
+ if (PEXITED (p) && (sig == SIGTERM || sig == SIGHUP))
+ kill (p->pid, SIGCONT);
+ p = p->next;
+ }
+ while (p != jobs[job]->pipe);
+ }
+ else
+ {
+ result = killpg (jobs[job]->pgrp, sig);
+ if (p && STOPPED (job) && (sig == SIGTERM || sig == SIGHUP))
+ killpg (jobs[job]->pgrp, SIGCONT);
+ /* If we're continuing a stopped job via kill rather than bg or
+ fg, emulate the `bg' behavior. */
+ if (p && STOPPED (job) && (sig == SIGCONT))
+ {
+ set_job_running (job);
+ jobs[job]->flags &= ~J_FOREGROUND;
+ jobs[job]->flags |= J_NOTIFIED;
+ }
+ }
+ }
+ else
+ result = killpg (pid, sig);
+
+ UNBLOCK_CHILD (oset);
+ }
+ else
+ result = kill (pid, sig);
+
+ return (result);
+}
+
+/* sigchld_handler () flushes at least one of the children that we are
+ waiting for. It gets run when we have gotten a SIGCHLD signal. */
+static sighandler
+sigchld_handler (sig)
+ int sig;
+{
+ int n, oerrno;
+
+ oerrno = errno;
+ REINSTALL_SIGCHLD_HANDLER;
+ sigchld++;
+ n = 0;
+ if (queue_sigchld == 0)
+ n = waitchld (-1, 0);
+ errno = oerrno;
+ SIGRETURN (n);
+}
+
+/* waitchld() reaps dead or stopped children. It's called by wait_for and
+ sigchld_handler, and runs until there aren't any children terminating any
+ more.
+ If BLOCK is 1, this is to be a blocking wait for a single child, although
+ an arriving SIGCHLD could cause the wait to be non-blocking. It returns
+ the number of children reaped, or -1 if there are no unwaited-for child
+ processes. */
+static int
+waitchld (wpid, block)
+ pid_t wpid;
+ int block;
+{
+ WAIT status;
+ PROCESS *child;
+ pid_t pid;
+ int call_set_current, last_stopped_job, job, children_exited, waitpid_flags;
+ static int wcontinued = WCONTINUED; /* run-time fix for glibc problem */
+
+ call_set_current = children_exited = 0;
+ last_stopped_job = NO_JOB;
+
+ do
+ {
+ /* We don't want to be notified about jobs stopping if job control
+ is not active. XXX - was interactive_shell instead of job_control */
+ waitpid_flags = (job_control && subshell_environment == 0)
+ ? (WUNTRACED|wcontinued)
+ : 0;
+ if (sigchld || block == 0)
+ waitpid_flags |= WNOHANG;
+ /* Check for terminating signals and exit the shell if we receive one */
+ CHECK_TERMSIG;
+
+ /* Check for a trapped signal interrupting the wait builtin and jump out */
+ CHECK_WAIT_INTR;
+
+ if (block == 1 && queue_sigchld == 0 && (waitpid_flags & WNOHANG) == 0)
+ {
+ internal_warning (_("waitchld: turning on WNOHANG to avoid indefinite block"));
+ waitpid_flags |= WNOHANG;
+ }
+
+ pid = WAITPID (-1, &status, waitpid_flags);
+
+ /* WCONTINUED may be rejected by waitpid as invalid even when defined */
+ if (wcontinued && pid < 0 && errno == EINVAL)
+ {
+ wcontinued = 0;
+ continue; /* jump back to the test and retry without WCONTINUED */
+ }
+
+ /* The check for WNOHANG is to make sure we decrement sigchld only
+ if it was non-zero before we called waitpid. */
+ if (sigchld > 0 && (waitpid_flags & WNOHANG))
+ sigchld--;
+
+ /* If waitpid returns -1 with errno == ECHILD, there are no more
+ unwaited-for child processes of this shell. */
+ if (pid < 0 && errno == ECHILD)
+ {
+ if (children_exited == 0)
+ return -1;
+ else
+ break;
+ }
+
+ /* If waitpid returns 0, there are running children. If it returns -1,
+ the only other error POSIX says it can return is EINTR. */
+ CHECK_TERMSIG;
+ CHECK_WAIT_INTR;
+
+ /* If waitpid returns -1/EINTR and the shell saw a SIGINT, then we
+ assume the child has blocked or handled SIGINT. In that case, we
+ require the child to actually die due to SIGINT to act on the
+ SIGINT we received; otherwise we assume the child handled it and
+ let it go. */
+ if (pid < 0 && errno == EINTR && wait_sigint_received)
+ child_caught_sigint = 1;
+
+ if (pid <= 0)
+ continue; /* jumps right to the test */
+
+ /* If the child process did die due to SIGINT, forget our assumption
+ that it caught or otherwise handled it. */
+ if (WIFSIGNALED (status) && WTERMSIG (status) == SIGINT)
+ child_caught_sigint = 0;
+
+ /* children_exited is used to run traps on SIGCHLD. We don't want to
+ run the trap if a process is just being continued. */
+ if (WIFCONTINUED(status) == 0)
+ {
+ children_exited++;
+ js.c_living--;
+ }
+
+ /* Locate our PROCESS for this pid. */
+ child = find_process (pid, 1, &job); /* want living procs only */
+
+#if defined (COPROCESS_SUPPORT)
+ coproc_pidchk (pid, status);
+#endif
+
+ /* It is not an error to have a child terminate that we did
+ not have a record of. This child could have been part of
+ a pipeline in backquote substitution. Even so, I'm not
+ sure child is ever non-zero. */
+ if (child == 0)
+ {
+ if (WIFEXITED (status) || WIFSIGNALED (status))
+ js.c_reaped++;
+ continue;
+ }
+
+ /* Remember status, and whether or not the process is running. */
+ child->status = status;
+ child->running = WIFCONTINUED(status) ? PS_RUNNING : PS_DONE;
+
+ if (PEXITED (child))
+ {
+ js.c_totreaped++;
+ if (job != NO_JOB)
+ js.c_reaped++;
+ }
+
+ if (job == NO_JOB)
+ continue;
+
+ call_set_current += set_job_status_and_cleanup (job);
+
+ if (STOPPED (job))
+ last_stopped_job = job;
+ else if (DEADJOB (job) && last_stopped_job == job)
+ last_stopped_job = NO_JOB;
+ }
+ while ((sigchld || block == 0) && pid > (pid_t)0);
+
+ /* If a job was running and became stopped, then set the current
+ job. Otherwise, don't change a thing. */
+ if (call_set_current)
+ {
+ if (last_stopped_job != NO_JOB)
+ set_current_job (last_stopped_job);
+ else
+ reset_current ();
+ }
+
+ /* Call a SIGCHLD trap handler for each child that exits, if one is set. */
+ if (job_control && signal_is_trapped (SIGCHLD) && children_exited &&
+ trap_list[SIGCHLD] != (char *)IGNORE_SIG)
+ {
+ if (posixly_correct && this_shell_builtin && this_shell_builtin == wait_builtin)
+ {
+ interrupt_immediately = 0;
+ trap_handler (SIGCHLD); /* set pending_traps[SIGCHLD] */
+ wait_signal_received = SIGCHLD;
+ /* If we're in a signal handler, let CHECK_WAIT_INTR; pick it up;
+ run_pending_traps will call run_sigchld_trap later */
+ if (sigchld == 0)
+ longjmp (wait_intr_buf, 1);
+ }
+ else if (sigchld) /* called from signal handler */
+ queue_sigchld_trap (children_exited);
+ else
+ run_sigchld_trap (children_exited);
+ }
+
+ /* We have successfully recorded the useful information about this process
+ that has just changed state. If we notify asynchronously, and the job
+ that this process belongs to is no longer running, then notify the user
+ of that fact now. */
+ if (asynchronous_notification && interactive)
+ notify_of_job_status ();
+
+ return (children_exited);
+}
+
+/* Set the status of JOB and perform any necessary cleanup if the job is
+ marked as JDEAD.
+
+ Currently, the cleanup activity is restricted to handling any SIGINT
+ received while waiting for a foreground job to finish. */
+static int
+set_job_status_and_cleanup (job)
+ int job;
+{
+ PROCESS *child;
+ int tstatus, job_state, any_stopped, any_tstped, call_set_current;
+ SigHandler *temp_handler;
+
+ child = jobs[job]->pipe;
+ jobs[job]->flags &= ~J_NOTIFIED;
+
+ call_set_current = 0;
+
+ /*
+ * COMPUTE JOB STATUS
+ */
+
+ /* If all children are not running, but any of them is stopped, then
+ the job is stopped, not dead. */
+ job_state = any_stopped = any_tstped = 0;
+ do
+ {
+ job_state |= PRUNNING (child);
+#if 0
+ if (PEXITED (child) && (WIFSTOPPED (child->status)))
+#else
+ /* Only checking for WIFSTOPPED now, not for PS_DONE */
+ if (PSTOPPED (child))
+#endif
+ {
+ any_stopped = 1;
+ any_tstped |= job_control && (WSTOPSIG (child->status) == SIGTSTP);
+ }
+ child = child->next;
+ }
+ while (child != jobs[job]->pipe);
+
+ /* If job_state != 0, the job is still running, so don't bother with
+ setting the process exit status and job state unless we're
+ transitioning from stopped to running. */
+ if (job_state != 0 && JOBSTATE(job) != JSTOPPED)
+ return 0;
+
+ /*
+ * SET JOB STATUS
+ */
+
+ /* The job is either stopped or dead. Set the state of the job accordingly. */
+ if (any_stopped)
+ {
+ jobs[job]->state = JSTOPPED;
+ jobs[job]->flags &= ~J_FOREGROUND;
+ call_set_current++;
+ /* Suspending a job with SIGTSTP breaks all active loops. */
+ if (any_tstped && loop_level)
+ breaking = loop_level;
+ }
+ else if (job_state != 0) /* was stopped, now running */
+ {
+ jobs[job]->state = JRUNNING;
+ call_set_current++;
+ }
+ else
+ {
+ jobs[job]->state = JDEAD;
+ js.j_ndead++;
+
+#if 0
+ if (IS_FOREGROUND (job))
+ setjstatus (job);
+#endif
+
+ /* If this job has a cleanup function associated with it, call it
+ with `cleanarg' as the single argument, then set the function
+ pointer to NULL so it is not inadvertently called twice. The
+ cleanup function is responsible for deallocating cleanarg. */
+ if (jobs[job]->j_cleanup)
+ {
+ (*jobs[job]->j_cleanup) (jobs[job]->cleanarg);
+ jobs[job]->j_cleanup = (sh_vptrfunc_t *)NULL;
+ }
+ }
+
+ /*
+ * CLEANUP
+ *
+ * Currently, we just do special things if we got a SIGINT while waiting
+ * for a foreground job to complete
+ */
+
+ if (JOBSTATE (job) == JDEAD)
+ {
+ /* If we're running a shell script and we get a SIGINT with a
+ SIGINT trap handler, but the foreground job handles it and
+ does not exit due to SIGINT, run the trap handler but do not
+ otherwise act as if we got the interrupt. */
+ if (wait_sigint_received && interactive_shell == 0 &&
+ child_caught_sigint && IS_FOREGROUND (job) &&
+ signal_is_trapped (SIGINT))
+ {
+ int old_frozen;
+ wait_sigint_received = 0;
+ last_command_exit_value = process_exit_status (child->status);
+
+ old_frozen = jobs_list_frozen;
+ jobs_list_frozen = 1;
+ tstatus = maybe_call_trap_handler (SIGINT);
+ jobs_list_frozen = old_frozen;
+ }
+
+ /* If the foreground job is killed by SIGINT when job control is not
+ active, we need to perform some special handling.
+
+ The check of wait_sigint_received is a way to determine if the
+ SIGINT came from the keyboard (in which case the shell has already
+ seen it, and wait_sigint_received is non-zero, because keyboard
+ signals are sent to process groups) or via kill(2) to the foreground
+ process by another process (or itself). If the shell did receive the
+ SIGINT, it needs to perform normal SIGINT processing. */
+ else if (wait_sigint_received &&
+ child_caught_sigint == 0 &&
+ IS_FOREGROUND (job) && IS_JOBCONTROL (job) == 0)
+ {
+ int old_frozen;
+
+ wait_sigint_received = 0;
+
+ /* If SIGINT is trapped, set the exit status so that the trap
+ handler can see it. */
+ if (signal_is_trapped (SIGINT))
+ last_command_exit_value = process_exit_status (child->status);
+
+ /* If the signal is trapped, let the trap handler get it no matter
+ what and simply return if the trap handler returns.
+ maybe_call_trap_handler() may cause dead jobs to be removed from
+ the job table because of a call to execute_command. We work
+ around this by setting JOBS_LIST_FROZEN. */
+ old_frozen = jobs_list_frozen;
+ jobs_list_frozen = 1;
+ tstatus = maybe_call_trap_handler (SIGINT);
+ jobs_list_frozen = old_frozen;
+ if (tstatus == 0 && old_sigint_handler != INVALID_SIGNAL_HANDLER)
+ {
+ /* wait_sigint_handler () has already seen SIGINT and
+ allowed the wait builtin to jump out. We need to
+ call the original SIGINT handler, if necessary. If
+ the original handler is SIG_DFL, we need to resend
+ the signal to ourselves. */
+
+ temp_handler = old_sigint_handler;
+
+ /* Bogus. If we've reset the signal handler as the result
+ of a trap caught on SIGINT, then old_sigint_handler
+ will point to trap_handler, which now knows nothing about
+ SIGINT (if we reset the sighandler to the default).
+ In this case, we have to fix things up. What a crock. */
+ if (temp_handler == trap_handler && signal_is_trapped (SIGINT) == 0)
+ temp_handler = trap_to_sighandler (SIGINT);
+ restore_sigint_handler ();
+ if (temp_handler == SIG_DFL)
+ termsig_handler (SIGINT); /* XXX */
+ else if (temp_handler != SIG_IGN)
+ (*temp_handler) (SIGINT);
+ }
+ }
+ }
+
+ return call_set_current;
+}
+
+/* Build the array of values for the $PIPESTATUS variable from the set of
+ exit statuses of all processes in the job J. */
+static void
+setjstatus (j)
+ int j;
+{
+#if defined (ARRAY_VARS)
+ register int i;
+ register PROCESS *p;
+
+ for (i = 1, p = jobs[j]->pipe; p->next != jobs[j]->pipe; p = p->next, i++)
+ ;
+ i++;
+ if (statsize < i)
+ {
+ pstatuses = (int *)xrealloc (pstatuses, i * sizeof (int));
+ statsize = i;
+ }
+ i = 0;
+ p = jobs[j]->pipe;
+ do
+ {
+ pstatuses[i++] = process_exit_status (p->status);
+ p = p->next;
+ }
+ while (p != jobs[j]->pipe);
+
+ pstatuses[i] = -1; /* sentinel */
+ set_pipestatus_array (pstatuses, i);
+#endif
+}
+
+void
+run_sigchld_trap (nchild)
+ int nchild;
+{
+ char *trap_command;
+ int i;
+
+ /* Turn off the trap list during the call to parse_and_execute ()
+ to avoid potentially infinite recursive calls. Preserve the
+ values of last_command_exit_value, last_made_pid, and the_pipeline
+ around the execution of the trap commands. */
+ trap_command = savestring (trap_list[SIGCHLD]);
+
+ begin_unwind_frame ("SIGCHLD trap");
+ unwind_protect_int (last_command_exit_value);
+ unwind_protect_int (last_command_exit_signal);
+ unwind_protect_var (last_made_pid);
+ unwind_protect_int (interrupt_immediately);
+ unwind_protect_int (jobs_list_frozen);
+ unwind_protect_pointer (the_pipeline);
+ unwind_protect_pointer (subst_assign_varlist);
+
+ /* We have to add the commands this way because they will be run
+ in reverse order of adding. We don't want maybe_set_sigchld_trap ()
+ to reference freed memory. */
+ add_unwind_protect (xfree, trap_command);
+ add_unwind_protect (maybe_set_sigchld_trap, trap_command);
+
+ subst_assign_varlist = (WORD_LIST *)NULL;
+ the_pipeline = (PROCESS *)NULL;
+
+ set_impossible_sigchld_trap ();
+ jobs_list_frozen = 1;
+ for (i = 0; i < nchild; i++)
+ {
+ interrupt_immediately = 1;
+ parse_and_execute (savestring (trap_command), "trap", SEVAL_NOHIST|SEVAL_RESETLINE);
+ }
+
+ run_unwind_frame ("SIGCHLD trap");
+}
+
+/* Function to call when you want to notify people of changes
+ in job status. This prints out all jobs which are pending
+ notification to stderr, and marks those printed as already
+ notified, thus making them candidates for cleanup. */
+static void
+notify_of_job_status ()
+{
+ register int job, termsig;
+ char *dir;
+ sigset_t set, oset;
+ WAIT s;
+
+ if (jobs == 0 || js.j_jobslots == 0)
+ return;
+
+ if (old_ttou != 0)
+ {
+ sigemptyset (&set);
+ sigaddset (&set, SIGCHLD);
+ sigaddset (&set, SIGTTOU);
+ sigemptyset (&oset);
+ sigprocmask (SIG_BLOCK, &set, &oset);
+ }
+ else
+ queue_sigchld++;
+
+ /* XXX could use js.j_firstj here */
+ for (job = 0, dir = (char *)NULL; job < js.j_jobslots; job++)
+ {
+ if (jobs[job] && IS_NOTIFIED (job) == 0)
+ {
+ s = raw_job_exit_status (job);
+ termsig = WTERMSIG (s);
+
+ /* POSIX.2 says we have to hang onto the statuses of at most the
+ last CHILD_MAX background processes if the shell is running a
+ script. If the shell is running a script, either from a file
+ or standard input, don't print anything unless the job was
+ killed by a signal. */
+ if (startup_state == 0 && WIFSIGNALED (s) == 0 &&
+ ((DEADJOB (job) && IS_FOREGROUND (job) == 0) || STOPPED (job)))
+ continue;
+
+#if 0
+ /* If job control is disabled, don't print the status messages.
+ Mark dead jobs as notified so that they get cleaned up. If
+ startup_state == 2, we were started to run `-c command', so
+ don't print anything. */
+ if ((job_control == 0 && interactive_shell) || startup_state == 2)
+#else
+ /* If job control is disabled, don't print the status messages.
+ Mark dead jobs as notified so that they get cleaned up. If
+ startup_state == 2 and subshell_environment has the
+ SUBSHELL_COMSUB bit turned on, we were started to run a command
+ substitution, so don't print anything. */
+ if ((job_control == 0 && interactive_shell) ||
+ (startup_state == 2 && (subshell_environment & SUBSHELL_COMSUB)))
+#endif
+ {
+ /* POSIX.2 compatibility: if the shell is not interactive,
+ hang onto the job corresponding to the last asynchronous
+ pid until the user has been notified of its status or does
+ a `wait'. */
+ if (DEADJOB (job) && (interactive_shell || (find_last_pid (job, 0) != last_asynchronous_pid)))
+ jobs[job]->flags |= J_NOTIFIED;
+ continue;
+ }
+
+ /* Print info on jobs that are running in the background,
+ and on foreground jobs that were killed by anything
+ except SIGINT (and possibly SIGPIPE). */
+ switch (JOBSTATE (job))
+ {
+ case JDEAD:
+ if (interactive_shell == 0 && termsig && WIFSIGNALED (s) &&
+ termsig != SIGINT &&
+#if defined (DONT_REPORT_SIGTERM)
+ termsig != SIGTERM &&
+#endif
+#if defined (DONT_REPORT_SIGPIPE)
+ termsig != SIGPIPE &&
+#endif
+ signal_is_trapped (termsig) == 0)
+ {
+ /* Don't print `0' for a line number. */
+ fprintf (stderr, _("%s: line %d: "), get_name_for_error (), (line_number == 0) ? 1 : line_number);
+ pretty_print_job (job, JLIST_NONINTERACTIVE, stderr);
+ }
+ else if (IS_FOREGROUND (job))
+ {
+#if !defined (DONT_REPORT_SIGPIPE)
+ if (termsig && WIFSIGNALED (s) && termsig != SIGINT)
+#else
+ if (termsig && WIFSIGNALED (s) && termsig != SIGINT && termsig != SIGPIPE)
+#endif
+ {
+ fprintf (stderr, "%s", j_strsignal (termsig));
+
+ if (WIFCORED (s))
+ fprintf (stderr, _(" (core dumped)"));
+
+ fprintf (stderr, "\n");
+ }
+ }
+ else if (job_control) /* XXX job control test added */
+ {
+ if (dir == 0)
+ dir = current_working_directory ();
+ pretty_print_job (job, JLIST_STANDARD, stderr);
+ if (dir && strcmp (dir, jobs[job]->wd) != 0)
+ fprintf (stderr,
+ _("(wd now: %s)\n"), polite_directory_format (dir));
+ }
+
+ jobs[job]->flags |= J_NOTIFIED;
+ break;
+
+ case JSTOPPED:
+ fprintf (stderr, "\n");
+ if (dir == 0)
+ dir = current_working_directory ();
+ pretty_print_job (job, JLIST_STANDARD, stderr);
+ if (dir && (strcmp (dir, jobs[job]->wd) != 0))
+ fprintf (stderr,
+ _("(wd now: %s)\n"), polite_directory_format (dir));
+ jobs[job]->flags |= J_NOTIFIED;
+ break;
+
+ case JRUNNING:
+ case JMIXED:
+ break;
+
+ default:
+ programming_error ("notify_of_job_status");
+ }
+ }
+ }
+ if (old_ttou != 0)
+ sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
+ else
+ queue_sigchld--;
+}
+
+/* Initialize the job control mechanism, and set up the tty stuff. */
+int
+initialize_job_control (force)
+ int force;
+{
+ pid_t t;
+ int t_errno;
+
+ t_errno = -1;
+ shell_pgrp = getpgid (0);
+
+ if (shell_pgrp == -1)
+ {
+ sys_error (_("initialize_job_control: getpgrp failed"));
+ exit (1);
+ }
+
+ /* We can only have job control if we are interactive unless we force it. */
+ if (interactive == 0 && force == 0)
+ {
+ job_control = 0;
+ original_pgrp = NO_PID;
+ shell_tty = fileno (stderr);
+ }
+ else
+ {
+ shell_tty = -1;
+
+ /* If forced_interactive is set, we skip the normal check that stderr
+ is attached to a tty, so we need to check here. If it's not, we
+ need to see whether we have a controlling tty by opening /dev/tty,
+ since trying to use job control tty pgrp manipulations on a non-tty
+ is going to fail. */
+ if (forced_interactive && isatty (fileno (stderr)) == 0)
+ shell_tty = open ("/dev/tty", O_RDWR|O_NONBLOCK);
+
+ /* Get our controlling terminal. If job_control is set, or
+ interactive is set, then this is an interactive shell no
+ matter where fd 2 is directed. */
+ if (shell_tty == -1)
+ shell_tty = dup (fileno (stderr)); /* fd 2 */
+
+ if (shell_tty != -1)
+ shell_tty = move_to_high_fd (shell_tty, 1, -1);
+
+ /* Compensate for a bug in systems that compiled the BSD
+ rlogind with DEBUG defined, like NeXT and Alliant. */
+ if (shell_pgrp == 0)
+ {
+ shell_pgrp = getpid ();
+ setpgid (0, shell_pgrp);
+ tcsetpgrp (shell_tty, shell_pgrp);
+ }
+
+ while ((terminal_pgrp = tcgetpgrp (shell_tty)) != -1)
+ {
+ if (shell_pgrp != terminal_pgrp)
+ {
+ SigHandler *ottin;
+
+ ottin = set_signal_handler(SIGTTIN, SIG_DFL);
+ kill (0, SIGTTIN);
+ set_signal_handler (SIGTTIN, ottin);
+ continue;
+ }
+ break;
+ }
+
+ if (terminal_pgrp == -1)
+ t_errno = errno;
+
+ /* Make sure that we are using the new line discipline. */
+ if (set_new_line_discipline (shell_tty) < 0)
+ {
+ sys_error (_("initialize_job_control: line discipline"));
+ job_control = 0;
+ }
+ else
+ {
+ original_pgrp = shell_pgrp;
+ shell_pgrp = getpid ();
+
+ if ((original_pgrp != shell_pgrp) && (setpgid (0, shell_pgrp) < 0))
+ {
+ sys_error (_("initialize_job_control: setpgid"));
+ shell_pgrp = original_pgrp;
+ }
+
+ job_control = 1;
+
+ /* If (and only if) we just set our process group to our pid,
+ thereby becoming a process group leader, and the terminal
+ is not in the same process group as our (new) process group,
+ then set the terminal's process group to our (new) process
+ group. If that fails, set our process group back to what it
+ was originally (so we can still read from the terminal) and
+ turn off job control. */
+ if (shell_pgrp != original_pgrp && shell_pgrp != terminal_pgrp)
+ {
+ if (give_terminal_to (shell_pgrp, 0) < 0)
+ {
+ t_errno = errno;
+ setpgid (0, original_pgrp);
+ shell_pgrp = original_pgrp;
+ errno = t_errno;
+ sys_error (_("cannot set terminal process group (%d)"), shell_pgrp);
+ job_control = 0;
+ }
+ }
+
+ if (job_control && ((t = tcgetpgrp (shell_tty)) == -1 || t != shell_pgrp))
+ {
+ if (t_errno != -1)
+ errno = t_errno;
+ sys_error (_("cannot set terminal process group (%d)"), t);
+ job_control = 0;
+ }
+ }
+ if (job_control == 0)
+ internal_error (_("no job control in this shell"));
+ }
+
+ if (shell_tty != fileno (stderr))
+ SET_CLOSE_ON_EXEC (shell_tty);
+
+ set_signal_handler (SIGCHLD, sigchld_handler);
+
+ change_flag ('m', job_control ? '-' : '+');
+
+ if (interactive)
+ get_tty_state ();
+
+ if (js.c_childmax < 0)
+ js.c_childmax = getmaxchild ();
+ if (js.c_childmax < 0)
+ js.c_childmax = DEFAULT_CHILD_MAX;
+
+ return job_control;
+}
+
+#ifdef DEBUG
+void
+debug_print_pgrps ()
+{
+ itrace("original_pgrp = %ld shell_pgrp = %ld terminal_pgrp = %ld",
+ (long)original_pgrp, (long)shell_pgrp, (long)terminal_pgrp);
+ itrace("tcgetpgrp(%d) -> %ld, getpgid(0) -> %ld",
+ shell_tty, (long)tcgetpgrp (shell_tty), (long)getpgid(0));
+}
+#endif
+
+/* Set the line discipline to the best this system has to offer.
+ Return -1 if this is not possible. */
+static int
+set_new_line_discipline (tty)
+ int tty;
+{
+#if defined (NEW_TTY_DRIVER)
+ int ldisc;
+
+ if (ioctl (tty, TIOCGETD, &ldisc) < 0)
+ return (-1);
+
+ if (ldisc != NTTYDISC)
+ {
+ ldisc = NTTYDISC;
+
+ if (ioctl (tty, TIOCSETD, &ldisc) < 0)
+ return (-1);
+ }
+ return (0);
+#endif /* NEW_TTY_DRIVER */
+
+#if defined (TERMIO_TTY_DRIVER)
+# if defined (TERMIO_LDISC) && (NTTYDISC)
+ if (ioctl (tty, TCGETA, &shell_tty_info) < 0)
+ return (-1);
+
+ if (shell_tty_info.c_line != NTTYDISC)
+ {
+ shell_tty_info.c_line = NTTYDISC;
+ if (ioctl (tty, TCSETAW, &shell_tty_info) < 0)
+ return (-1);
+ }
+# endif /* TERMIO_LDISC && NTTYDISC */
+ return (0);
+#endif /* TERMIO_TTY_DRIVER */
+
+#if defined (TERMIOS_TTY_DRIVER)
+# if defined (TERMIOS_LDISC) && defined (NTTYDISC)
+ if (tcgetattr (tty, &shell_tty_info) < 0)
+ return (-1);
+
+ if (shell_tty_info.c_line != NTTYDISC)
+ {
+ shell_tty_info.c_line = NTTYDISC;
+ if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0)
+ return (-1);
+ }
+# endif /* TERMIOS_LDISC && NTTYDISC */
+ return (0);
+#endif /* TERMIOS_TTY_DRIVER */
+
+#if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER)
+ return (-1);
+#endif
+}
+
+/* Setup this shell to handle C-C, etc. */
+void
+initialize_job_signals ()
+{
+ if (interactive)
+ {
+ set_signal_handler (SIGINT, sigint_sighandler);
+ set_signal_handler (SIGTSTP, SIG_IGN);
+ set_signal_handler (SIGTTOU, SIG_IGN);
+ set_signal_handler (SIGTTIN, SIG_IGN);
+ }
+ else if (job_control)
+ {
+ old_tstp = set_signal_handler (SIGTSTP, sigstop_sighandler);
+ old_ttin = set_signal_handler (SIGTTIN, sigstop_sighandler);
+ old_ttou = set_signal_handler (SIGTTOU, sigstop_sighandler);
+ }
+ /* Leave these things alone for non-interactive shells without job
+ control. */
+}
+
+/* Here we handle CONT signals. */
+static sighandler
+sigcont_sighandler (sig)
+ int sig;
+{
+ initialize_job_signals ();
+ set_signal_handler (SIGCONT, old_cont);
+ kill (getpid (), SIGCONT);
+
+ SIGRETURN (0);
+}
+
+/* Here we handle stop signals while we are running not as a login shell. */
+static sighandler
+sigstop_sighandler (sig)
+ int sig;
+{
+ set_signal_handler (SIGTSTP, old_tstp);
+ set_signal_handler (SIGTTOU, old_ttou);
+ set_signal_handler (SIGTTIN, old_ttin);
+
+ old_cont = set_signal_handler (SIGCONT, sigcont_sighandler);
+
+ give_terminal_to (shell_pgrp, 0);
+
+ kill (getpid (), sig);
+
+ SIGRETURN (0);
+}
+
+/* Give the terminal to PGRP. */
+int
+give_terminal_to (pgrp, force)
+ pid_t pgrp;
+ int force;
+{
+ sigset_t set, oset;
+ int r, e;
+
+ r = 0;
+ if (job_control || force)
+ {
+ sigemptyset (&set);
+ sigaddset (&set, SIGTTOU);
+ sigaddset (&set, SIGTTIN);
+ sigaddset (&set, SIGTSTP);
+ sigaddset (&set, SIGCHLD);
+ sigemptyset (&oset);
+ sigprocmask (SIG_BLOCK, &set, &oset);
+
+ if (tcsetpgrp (shell_tty, pgrp) < 0)
+ {
+ /* Maybe we should print an error message? */
+#if 0
+ sys_error ("tcsetpgrp(%d) failed: pid %ld to pgrp %ld",
+ shell_tty, (long)getpid(), (long)pgrp);
+#endif
+ r = -1;
+ e = errno;
+ }
+ else
+ terminal_pgrp = pgrp;
+ sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
+ }
+
+ if (r == -1)
+ errno = e;
+
+ return r;
+}
+
+/* Give terminal to NPGRP iff it's currently owned by OPGRP. FLAGS are the
+ flags to pass to give_terminal_to(). */
+static int
+maybe_give_terminal_to (opgrp, npgrp, flags)
+ pid_t opgrp, npgrp;
+ int flags;
+{
+ int tpgrp;
+
+ tpgrp = tcgetpgrp (shell_tty);
+ if (tpgrp < 0 && errno == ENOTTY)
+ return -1;
+ if (tpgrp == npgrp)
+ {
+ terminal_pgrp = npgrp;
+ return 0;
+ }
+ else if (tpgrp != opgrp)
+ {
+#if defined (DEBUG)
+ internal_warning ("maybe_give_terminal_to: terminal pgrp == %d shell pgrp = %d new pgrp = %d", tpgrp, opgrp, npgrp);
+#endif
+ return -1;
+ }
+ else
+ return (give_terminal_to (npgrp, flags));
+}
+
+/* Clear out any jobs in the job array. This is intended to be used by
+ children of the shell, who should not have any job structures as baggage
+ when they start executing (forking subshells for parenthesized execution
+ and functions with pipes are the two that spring to mind). If RUNNING_ONLY
+ is nonzero, only running jobs are removed from the table. */
+void
+delete_all_jobs (running_only)
+ int running_only;
+{
+ register int i;
+ sigset_t set, oset;
+
+ BLOCK_CHILD (set, oset);
+
+ /* XXX - need to set j_lastj, j_firstj appropriately if running_only != 0. */
+ if (js.j_jobslots)
+ {
+ js.j_current = js.j_previous = NO_JOB;
+
+ /* XXX could use js.j_firstj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ {
+#if defined (DEBUG)
+ if (i < js.j_firstj && jobs[i])
+ itrace("delete_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
+ if (i > js.j_lastj && jobs[i])
+ itrace("delete_all_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
+#endif
+ if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i))))
+ delete_job (i, DEL_WARNSTOPPED);
+ }
+ if (running_only == 0)
+ {
+ free ((char *)jobs);
+ js.j_jobslots = 0;
+ js.j_firstj = js.j_lastj = js.j_njobs = 0;
+ }
+ }
+
+ if (running_only == 0)
+ bgp_clear ();
+
+ UNBLOCK_CHILD (oset);
+}
+
+/* Mark all jobs in the job array so that they don't get a SIGHUP when the
+ shell gets one. If RUNNING_ONLY is nonzero, mark only running jobs. */
+void
+nohup_all_jobs (running_only)
+ int running_only;
+{
+ register int i;
+ sigset_t set, oset;
+
+ BLOCK_CHILD (set, oset);
+
+ if (js.j_jobslots)
+ {
+ /* XXX could use js.j_firstj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i))))
+ nohup_job (i);
+ }
+
+ UNBLOCK_CHILD (oset);
+}
+
+int
+count_all_jobs ()
+{
+ int i, n;
+ sigset_t set, oset;
+
+ /* This really counts all non-dead jobs. */
+ BLOCK_CHILD (set, oset);
+ /* XXX could use js.j_firstj here */
+ for (i = n = 0; i < js.j_jobslots; i++)
+ {
+#if defined (DEBUG)
+ if (i < js.j_firstj && jobs[i])
+ itrace("count_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
+ if (i > js.j_lastj && jobs[i])
+ itrace("count_all_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
+#endif
+ if (jobs[i] && DEADJOB(i) == 0)
+ n++;
+ }
+ UNBLOCK_CHILD (oset);
+ return n;
+}
+
+static void
+mark_all_jobs_as_dead ()
+{
+ register int i;
+ sigset_t set, oset;
+
+ if (js.j_jobslots == 0)
+ return;
+
+ BLOCK_CHILD (set, oset);
+
+ /* XXX could use js.j_firstj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ if (jobs[i])
+ {
+ jobs[i]->state = JDEAD;
+ js.j_ndead++;
+ }
+
+ UNBLOCK_CHILD (oset);
+}
+
+/* Mark all dead jobs as notified, so delete_job () cleans them out
+ of the job table properly. POSIX.2 says we need to save the
+ status of the last CHILD_MAX jobs, so we count the number of dead
+ jobs and mark only enough as notified to save CHILD_MAX statuses. */
+static void
+mark_dead_jobs_as_notified (force)
+ int force;
+{
+ register int i, ndead, ndeadproc;
+ sigset_t set, oset;
+
+ if (js.j_jobslots == 0)
+ return;
+
+ BLOCK_CHILD (set, oset);
+
+ /* If FORCE is non-zero, we don't have to keep CHILD_MAX statuses
+ around; just run through the array. */
+ if (force)
+ {
+ /* XXX could use js.j_firstj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ {
+ if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid)))
+ jobs[i]->flags |= J_NOTIFIED;
+ }
+ UNBLOCK_CHILD (oset);
+ return;
+ }
+
+ /* Mark enough dead jobs as notified to keep CHILD_MAX processes left in the
+ array with the corresponding not marked as notified. This is a better
+ way to avoid pid aliasing and reuse problems than keeping the POSIX-
+ mandated CHILD_MAX jobs around. delete_job() takes care of keeping the
+ bgpids list regulated. */
+
+ /* Count the number of dead jobs */
+ /* XXX could use js.j_firstj here */
+ for (i = ndead = ndeadproc = 0; i < js.j_jobslots; i++)
+ {
+#if defined (DEBUG)
+ if (i < js.j_firstj && jobs[i])
+ itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
+ if (i > js.j_lastj && jobs[i])
+ itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
+#endif
+ if (jobs[i] && DEADJOB (i))
+ {
+ ndead++;
+ ndeadproc += processes_in_job (i);
+ }
+ }
+
+#ifdef DEBUG
+ if (ndeadproc != js.c_reaped)
+ itrace("mark_dead_jobs_as_notified: ndeadproc (%d) != js.c_reaped (%d)", ndeadproc, js.c_reaped);
+ if (ndead != js.j_ndead)
+ itrace("mark_dead_jobs_as_notified: ndead (%d) != js.j_ndead (%d)", ndead, js.j_ndead);
+#endif
+
+ if (js.c_childmax < 0)
+ js.c_childmax = getmaxchild ();
+ if (js.c_childmax < 0)
+ js.c_childmax = DEFAULT_CHILD_MAX;
+
+ /* Don't do anything if the number of dead processes is less than CHILD_MAX
+ and we're not forcing a cleanup. */
+ if (ndeadproc <= js.c_childmax)
+ {
+ UNBLOCK_CHILD (oset);
+ return;
+ }
+
+#if 0
+itrace("mark_dead_jobs_as_notified: child_max = %d ndead = %d ndeadproc = %d", js.c_childmax, ndead, ndeadproc);
+#endif
+
+ /* Mark enough dead jobs as notified that we keep CHILD_MAX jobs in
+ the list. This isn't exactly right yet; changes need to be made
+ to stop_pipeline so we don't mark the newer jobs after we've
+ created CHILD_MAX slots in the jobs array. This needs to be
+ integrated with a way to keep the jobs array from growing without
+ bound. Maybe we wrap back around to 0 after we reach some max
+ limit, and there are sufficient job slots free (keep track of total
+ size of jobs array (js.j_jobslots) and running count of number of jobs
+ in jobs array. Then keep a job index corresponding to the `oldest job'
+ and start this loop there, wrapping around as necessary. In effect,
+ we turn the list into a circular buffer. */
+ /* XXX could use js.j_firstj here */
+ for (i = 0; i < js.j_jobslots; i++)
+ {
+ if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid)))
+ {
+#if defined (DEBUG)
+ if (i < js.j_firstj && jobs[i])
+ itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
+ if (i > js.j_lastj && jobs[i])
+ itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
+#endif
+ /* If marking this job as notified would drop us down below
+ child_max, don't mark it so we can keep at least child_max
+ statuses. XXX -- need to check what Posix actually says
+ about keeping statuses. */
+ if ((ndeadproc -= processes_in_job (i)) <= js.c_childmax)
+ break;
+ jobs[i]->flags |= J_NOTIFIED;
+ }
+ }
+
+ UNBLOCK_CHILD (oset);
+}
+
+/* Here to allow other parts of the shell (like the trap stuff) to
+ freeze and unfreeze the jobs list. */
+void
+freeze_jobs_list ()
+{
+ jobs_list_frozen = 1;
+}
+
+void
+unfreeze_jobs_list ()
+{
+ jobs_list_frozen = 0;
+}
+
+/* Allow or disallow job control to take place. Returns the old value
+ of job_control. */
+int
+set_job_control (arg)
+ int arg;
+{
+ int old;
+
+ old = job_control;
+ job_control = arg;
+
+ /* If we're turning on job control, reset pipeline_pgrp so make_child will
+ put new child processes into the right pgrp */
+ if (job_control != old && job_control)
+ pipeline_pgrp = 0;
+
+ return (old);
+}
+
+/* Turn off all traces of job control. This is run by children of the shell
+ which are going to do shellsy things, like wait (), etc. */
+void
+without_job_control ()
+{
+ stop_making_children ();
+ start_pipeline ();
+#if defined (PGRP_PIPE)
+ sh_closepipe (pgrp_pipe);
+#endif
+ delete_all_jobs (0);
+ set_job_control (0);
+}
+
+/* If this shell is interactive, terminate all stopped jobs and
+ restore the original terminal process group. This is done
+ before the `exec' builtin calls shell_execve. */
+void
+end_job_control ()
+{
+ if (interactive_shell) /* XXX - should it be interactive? */
+ {
+ terminate_stopped_jobs ();
+
+ if (original_pgrp >= 0)
+ give_terminal_to (original_pgrp, 1);
+ }
+
+ if (original_pgrp >= 0)
+ setpgid (0, original_pgrp);
+}
+
+/* Restart job control by closing shell tty and reinitializing. This is
+ called after an exec fails in an interactive shell and we do not exit. */
+void
+restart_job_control ()
+{
+ if (shell_tty != -1)
+ close (shell_tty);
+ initialize_job_control (0);
+}
+
+void
+set_maxchild (nchild)
+ int nchild;
+{
+ static int lmaxchild = -1;
+
+ if (lmaxchild < 0)
+ lmaxchild = getmaxchild ();
+ if (lmaxchild < 0)
+ lmaxchild = DEFAULT_CHILD_MAX;
+
+ /* Clamp value we set. Minimum is what Posix requires, maximum is defined
+ above as MAX_CHILD_MAX. */
+ if (nchild < lmaxchild)
+ nchild = lmaxchild;
+ else if (nchild > MAX_CHILD_MAX)
+ nchild = MAX_CHILD_MAX;
+
+ js.c_childmax = nchild;
+}
+
+/* Set the handler to run when the shell receives a SIGCHLD signal. */
+void
+set_sigchld_handler ()
+{
+ set_signal_handler (SIGCHLD, sigchld_handler);
+}
+
+#if defined (PGRP_PIPE)
+/* Read from the read end of a pipe. This is how the process group leader
+ blocks until all of the processes in a pipeline have been made. */
+static void
+pipe_read (pp)
+ int *pp;
+{
+ char ch;
+
+ if (pp[1] >= 0)
+ {
+ close (pp[1]);
+ pp[1] = -1;
+ }
+
+ if (pp[0] >= 0)
+ {
+ while (read (pp[0], &ch, 1) == -1 && errno == EINTR)
+ ;
+ }
+}
+
+/* Functional interface closes our local-to-job-control pipes. */
+void
+close_pgrp_pipe ()
+{
+ sh_closepipe (pgrp_pipe);
+}
+
+void
+save_pgrp_pipe (p, clear)
+ int *p;
+ int clear;
+{
+ p[0] = pgrp_pipe[0];
+ p[1] = pgrp_pipe[1];
+ if (clear)
+ pgrp_pipe[0] = pgrp_pipe[1] = -1;
+}
+
+void
+restore_pgrp_pipe (p)
+ int *p;
+{
+ pgrp_pipe[0] = p[0];
+ pgrp_pipe[1] = p[1];
+}
+
+#endif /* PGRP_PIPE */
projects / thirdparty / bash.git / commitdiff
