-/* The thing that makes children, remembers them, and contains wait loops. */
+/* nojobs.c - functions that make children, remember them, and handle their termination. */
/* This file works under BSD, System V, minix, and Posix systems. It does
not implement job control. */
-/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2011 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 2, or (at your option) any later
- version.
+ 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.
+ 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; see the file COPYING. If not, write to the Free Software
- Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+ 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"
/* Need to include this up here for *_TTY_DRIVER definitions. */
#include "shtty.h"
-#if !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
-/* For struct winsize on SCO */
-/* sys/ptem.h has winsize but needs mblk_t from sys/stream.h */
-# if defined (HAVE_SYS_PTEM_H) && defined (TIOCGWINSZ) && defined (SIGWINCH)
-# if defined (HAVE_SYS_STREAM_H)
-# include <sys/stream.h>
-# endif
-# include <sys/ptem.h>
-# endif /* HAVE_SYS_PTEM_H && TIOCGWINSZ && SIGWINCH */
-#endif /* !STRUCT_WINSIZE_IN_SYS_IOCTL */
+#include "bashintl.h"
#include "shell.h"
#include "jobs.h"
+#include "execute_cmd.h"
#include "builtins/builtext.h" /* for wait_builtin */
-#if !defined (CHILD_MAX)
-# define CHILD_MAX 32
-#endif
+#define DEFAULT_CHILD_MAX 32
#if defined (_POSIX_VERSION) || !defined (HAVE_KILLPG)
# define killpg(pg, sig) kill(-(pg),(sig))
#endif /* USG || _POSIX_VERSION */
-#if !defined (HAVE_SIGINTERRUPT)
+#if !defined (HAVE_SIGINTERRUPT) && !defined (HAVE_POSIX_SIGNALS)
# define siginterrupt(sig, code)
-#endif /* !HAVE_SIGINTERRUPT */
+#endif /* !HAVE_SIGINTERRUPT && !HAVE_POSIX_SIGNALS */
#if defined (HAVE_WAITPID)
# define WAITPID(pid, statusp, options) waitpid (pid, statusp, options)
extern int errno;
#endif /* !errno */
-#if defined (READLINE)
-extern void _rl_set_screen_size ();
-#endif
-
extern int interactive, interactive_shell, login_shell;
extern int subshell_environment;
-extern int last_command_exit_value;
+extern int last_command_exit_value, last_command_exit_signal;
extern int interrupt_immediately;
-extern Function *this_shell_builtin;
+extern sh_builtin_func_t *this_shell_builtin;
#if defined (HAVE_POSIX_SIGNALS)
extern sigset_t top_level_mask;
#endif
extern procenv_t wait_intr_buf;
+extern int wait_signal_received;
-pid_t last_made_pid = NO_PID;
-pid_t last_asynchronous_pid = NO_PID;
+volatile pid_t last_made_pid = NO_PID;
+volatile pid_t last_asynchronous_pid = NO_PID;
/* 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;
-
-#if defined (HAVE_WAITPID)
-static void reap_zombie_children ();
-#endif
+int check_window_size = CHECKWINSIZE_DEFAULT;
-static int wait_sigint_received;
+/* We don't have job control. */
+int job_control = 0;
/* STATUS and FLAGS are only valid if pid != NO_PID
STATUS is only valid if (flags & PROC_RUNNING) == 0 */
#define PROC_RUNNING 0x01
#define PROC_NOTIFIED 0x02
#define PROC_ASYNC 0x04
-
-static struct proc_status *pid_list = (struct proc_status *)NULL;
-static int pid_list_size;
+#define PROC_SIGNALED 0x10
/* Return values from find_status_by_pid */
#define PROC_BAD -1
#define PROC_STILL_ALIVE -2
+static struct proc_status *pid_list = (struct proc_status *)NULL;
+static int pid_list_size;
+static int wait_sigint_received;
+
+static long child_max = -1L;
+
+static void alloc_pid_list __P((void));
+static int find_proc_slot __P((void));
+static int find_index_by_pid __P((pid_t));
+static int find_status_by_pid __P((pid_t));
+static int process_exit_status __P((WAIT));
+static int find_termsig_by_pid __P((pid_t));
+static int get_termsig __P((WAIT));
+static void set_pid_status __P((pid_t, WAIT));
+static void set_pid_flags __P((pid_t, int));
+static void unset_pid_flags __P((pid_t, int));
+static int get_pid_flags __P((pid_t));
+static void add_pid __P((pid_t, int));
+static void mark_dead_jobs_as_notified __P((int));
+
+static sighandler wait_sigint_handler __P((int));
+static char *j_strsignal __P((int));
+
+#if defined (HAVE_WAITPID)
+static void reap_zombie_children __P((void));
+#endif
+
+#if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS)
+static int siginterrupt __P((int, int));
+#endif
+
+static void restore_sigint_handler __P((void));
+
/* Allocate new, or grow existing PID_LIST. */
static void
alloc_pid_list ()
int old = pid_list_size;
pid_list_size += 10;
- pid_list = (struct proc_status *)
- xrealloc (pid_list, pid_list_size * sizeof (struct proc_status));
+ pid_list = (struct proc_status *)xrealloc (pid_list, pid_list_size * sizeof (struct proc_status));
/* None of the newly allocated slots have process id's yet. */
for (i = old; i < pid_list_size; i++)
return (WEXITSTATUS (status));
}
+/* Return the status of PID as looked up in the PID_LIST array. A
+ return value of PROC_BAD indicates that PID wasn't found. */
+static int
+find_termsig_by_pid (pid)
+ pid_t pid;
+{
+ int i;
+
+ i = find_index_by_pid (pid);
+ if (i == NO_PID)
+ return (0);
+ if (pid_list[i].flags & PROC_RUNNING)
+ return (0);
+ return (get_termsig ((WAIT)pid_list[i].status));
+}
+
+/* Set LAST_COMMAND_EXIT_SIGNAL depending on STATUS. If STATUS is -1, look
+ up PID in the pid array and set LAST_COMMAND_EXIT_SIGNAL appropriately
+ depending on its flags and exit status. */
+static int
+get_termsig (status)
+ WAIT status;
+{
+ if (WIFSTOPPED (status) == 0 && WIFSIGNALED (status))
+ return (WTERMSIG (status));
+ else
+ return (0);
+}
+
/* Give PID the status value STATUS in the PID_LIST array. */
static void
set_pid_status (pid, status)
{
int slot;
+#if defined (COPROCESS_SUPPORT)
+ coproc_pidchk (pid, status);
+#endif
+
slot = find_index_by_pid (pid);
if (slot == NO_PID)
return;
pid_list[slot].status = process_exit_status (status);
pid_list[slot].flags &= ~PROC_RUNNING;
+ if (WIFSIGNALED (status))
+ pid_list[slot].flags |= PROC_SIGNALED;
/* If it's not a background process, mark it as notified so it gets
cleaned up. */
if ((pid_list[slot].flags & PROC_ASYNC) == 0)
pid_list[slot].flags &= ~flags;
}
+/* Return the flags corresponding to PID in the PID_LIST array. */
+static int
+get_pid_flags (pid)
+ pid_t pid;
+{
+ int slot;
+
+ slot = find_index_by_pid (pid);
+ if (slot == NO_PID)
+ return 0;
+
+ return (pid_list[slot].flags);
+}
+
static void
add_pid (pid, async)
pid_t pid;
continue;
if (((pid_list[i].flags & PROC_RUNNING) == 0) &&
(pid_list[i].flags & PROC_ASYNC))
- ndead++;
+ ndead++;
}
- if (force == 0 && ndead <= CHILD_MAX)
+ if (child_max < 0)
+ child_max = getmaxchild ();
+ if (child_max < 0)
+ child_max = DEFAULT_CHILD_MAX;
+
+ if (force == 0 && ndead <= child_max)
return;
/* If FORCE == 0, we just mark as many non-running async jobs as notified
pid_list[i].pid != last_asynchronous_pid)
{
pid_list[i].flags |= PROC_NOTIFIED;
- if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= CHILD_MAX)
+ if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= child_max)
break;
}
}
pid_list[i].pid = NO_PID;
}
+#if defined (COPROCESS_SUPPORT)
+ coproc_reap ();
+#endif
+
return 0;
}
get_tty_state ();
}
-#if defined (TIOCGWINSZ) && defined (SIGWINCH)
-static SigHandler *old_winch = (SigHandler *)SIG_DFL;
-
-static void
-get_new_window_size (from_sig)
- int from_sig;
-{
- struct winsize win;
- int tty;
-
- tty = input_tty ();
- if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) &&
- win.ws_row > 0 && win.ws_col > 0)
- {
-#if defined (aixpc)
- shell_tty_info.c_winsize = win; /* structure copying */
-#endif
- set_lines_and_columns (win.ws_row, win.ws_col);
-#if defined (READLINE)
- _rl_set_screen_size (win.ws_row, win.ws_col);
-#endif
- }
-}
-
-static sighandler
-sigwinch_sighandler (sig)
- int sig;
-{
-#if defined (MUST_REINSTALL_SIGHANDLERS)
- set_signal_handler (SIGWINCH, sigwinch_sighandler);
-#endif /* MUST_REINSTALL_SIGHANDLERS */
- get_new_window_size (1);
-}
-#else
-static void
-get_new_window_size (from_sig)
- int from_sig;
-{
-}
-#endif /* TIOCGWINSZ && SIGWINCH */
-
-void
-set_sigwinch_handler ()
-{
-#if defined (TIOCGWINSZ) && defined (SIGWINCH)
- old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler);
-#endif
-}
-
-void
-unset_sigwinch_handler ()
-{
-#if defined (TIOCGWINSZ) && defined (SIGWINCH)
- set_signal_handler (SIGWINCH, old_winch);
-#endif
-}
-
/* Setup this shell to handle C-C, etc. */
void
initialize_job_signals ()
{
set_signal_handler (SIGINT, sigint_sighandler);
- set_sigwinch_handler ();
/* If this is a login shell we don't wish to be disturbed by
stop signals. */
static void
reap_zombie_children ()
{
-#if defined (WNOHANG)
+# if defined (WNOHANG)
pid_t pid;
WAIT status;
+ CHECK_TERMSIG;
+ CHECK_WAIT_INTR;
while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0)
set_pid_status (pid, status);
+# endif /* WNOHANG */
+ CHECK_TERMSIG;
+ CHECK_WAIT_INTR;
+}
+#endif /* WAITPID */
+
+#if !defined (HAVE_SIGINTERRUPT) && defined (HAVE_POSIX_SIGNALS)
+
+#if !defined (SA_RESTART)
+# define SA_RESTART 0
#endif
+
+static int
+siginterrupt (sig, flag)
+ int sig, flag;
+{
+ struct sigaction act;
+
+ sigaction (sig, (struct sigaction *)NULL, &act);
+
+ if (flag)
+ act.sa_flags &= ~SA_RESTART;
+ else
+ act.sa_flags |= SA_RESTART;
+
+ return (sigaction (sig, &act, (struct sigaction *)NULL));
}
-#endif /* WAITPID && WNOHANG */
+#endif /* !HAVE_SIGINTERRUPT && HAVE_POSIX_SIGNALS */
/* 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
int async_p;
{
pid_t pid;
-#if defined (HAVE_WAITPID)
- int retry = 1;
-#endif /* HAVE_WAITPID */
+ int forksleep;
/* Discard saved memory. */
if (command)
sync_buffered_stream (default_buffered_input);
#endif /* BUFFERED_INPUT */
- /* Create the child, handle severe errors. */
-#if defined (HAVE_WAITPID)
- retry_fork:
-#endif /* HAVE_WAITPID */
+ /* XXX - block SIGTERM here and unblock in child after fork resets the
+ set of pending signals? */
+ RESET_SIGTERM;
- if ((pid = fork ()) < 0)
+ /* Create the child, handle severe errors. Retry on EAGAIN. */
+ forksleep = 1;
+ while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX)
{
+ sys_error ("fork: retry");
+ RESET_SIGTERM;
+
#if defined (HAVE_WAITPID)
/* Posix systems with a non-blocking waitpid () system call available
get another chance after zombies are reaped. */
- if (errno == EAGAIN && retry)
- {
- reap_zombie_children ();
- retry = 0;
- goto retry_fork;
- }
+ reap_zombie_children ();
+ if (forksleep > 1 && sleep (forksleep) != 0)
+ break;
+#else
+ if (sleep (forksleep) != 0)
+ break;
#endif /* HAVE_WAITPID */
+ forksleep <<= 1;
+ }
- sys_error ("fork");
+ if (pid != 0)
+ RESET_SIGTERM;
+ if (pid < 0)
+ {
+ sys_error ("fork");
+ last_command_exit_value = EX_NOEXEC;
throw_to_top_level ();
}
sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
#endif
+#if 0
/* Ignore INT and QUIT in asynchronous children. */
if (async_p)
last_asynchronous_pid = getpid ();
+#endif
default_tty_job_signals ();
}
/* Wait for a single pid (PID) and return its exit status. Called by
the wait builtin. */
+int
wait_for_single_pid (pid)
pid_t pid;
{
pid_t got_pid;
WAIT status;
- int pstatus;
+ int pstatus, flags;
pstatus = find_status_by_pid (pid);
if (pstatus == PROC_BAD)
{
- internal_error ("wait: pid %d is not a child of this shell", pid);
+ internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid);
return (127);
}
if (pstatus != PROC_STILL_ALIVE)
- return (pstatus);
+ {
+ if (pstatus > 128)
+ last_command_exit_signal = find_termsig_by_pid (pid);
+ return (pstatus);
+ }
siginterrupt (SIGINT, 1);
while ((got_pid = WAITPID (pid, &status, 0)) != pid)
{
+ CHECK_TERMSIG;
+ CHECK_WAIT_INTR;
if (got_pid < 0)
{
if (errno != EINTR && errno != ECHILD)
break;
}
else if (got_pid > 0)
- set_pid_status (got_pid, status);
+ set_pid_status (got_pid, status);
}
- set_pid_status (got_pid, status);
- set_pid_flags (got_pid, PROC_NOTIFIED);
+ if (got_pid > 0)
+ {
+ set_pid_status (got_pid, status);
+ set_pid_flags (got_pid, PROC_NOTIFIED);
+ }
siginterrupt (SIGINT, 0);
QUIT;
- return (process_exit_status (status));
+ return (got_pid > 0 ? process_exit_status (status) : -1);
}
/* Wait for all of the shell's children to exit. Called by the `wait'
signal_is_trapped (SIGINT) &&
((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler))
{
- last_command_exit_value = EXECUTION_FAILURE;
+ last_command_exit_value = 128+SIGINT;
restore_sigint_handler ();
interrupt_immediately = 0;
trap_handler (SIGINT); /* set pending_traps[SIGINT] */
- longjmp (wait_intr_buf, 1);
+ wait_signal_received = SIGINT;
+ SIGRETURN (0);
}
-#if 0
- /* Run a trap handler if one has been defined. */
- maybe_call_trap_handler (sig);
-#endif
+ if (interrupt_immediately)
+ {
+ last_command_exit_value = EXECUTION_FAILURE;
+ restore_sigint_handler ();
+ ADDINTERRUPT;
+ QUIT;
+ }
wait_sigint_received = 1;
SIGRETURN (0);
}
+static char *
+j_strsignal (s)
+ int s;
+{
+ static char retcode_name_buffer[64] = { '\0' };
+ char *x;
+
+ x = strsignal (s);
+ if (x == 0)
+ {
+ x = retcode_name_buffer;
+ sprintf (x, "Signal %d", s);
+ }
+ return x;
+}
+
/* Wait for pid (one of our children) to terminate. This is called only
by the execution code in execute_cmd.c. */
int
return (0);
if (pstatus != PROC_STILL_ALIVE)
- return (pstatus);
+ {
+ if (pstatus > 128)
+ last_command_exit_signal = find_termsig_by_pid (pid);
+ return (pstatus);
+ }
/* If we are running a script, ignore SIGINT while we're waiting for
a child to exit. The loop below does some of this, but not all. */
while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */
{
+ CHECK_TERMSIG;
+ CHECK_WAIT_INTR;
if (got_pid < 0 && errno == ECHILD)
{
#if !defined (_POSIX_VERSION)
break;
}
else if (got_pid < 0 && errno != EINTR)
- programming_error ("wait_for(%d): %s", pid, strerror(errno));
+ programming_error ("wait_for(%ld): %s", (long)pid, strerror(errno));
else if (got_pid > 0)
set_pid_status (got_pid, status);
}
- set_pid_status (got_pid, status);
+ if (got_pid > 0)
+ set_pid_status (got_pid, status);
#if defined (HAVE_WAITPID)
if (got_pid >= 0)
reap_zombie_children ();
#endif /* HAVE_WAITPID */
+ CHECK_TERMSIG;
+ CHECK_WAIT_INTR;
+
if (interactive_shell == 0)
{
SigHandler *temp_handler;
if (maybe_call_trap_handler (SIGINT) == 0)
{
if (temp_handler == SIG_DFL)
- termination_unwind_protect (SIGINT);
+ termsig_handler (SIGINT);
else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN)
(*temp_handler) (SIGINT);
}
/* Default return value. */
/* ``a full 8 bits of status is returned'' */
return_val = process_exit_status (status);
-
-#if !defined (DONT_REPORT_SIGPIPE)
- if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) &&
- (WTERMSIG (status) != SIGINT))
+ last_command_exit_signal = get_termsig (status);
+
+#if defined (DONT_REPORT_SIGPIPE) && defined (DONT_REPORT_SIGTERM)
+# define REPORTSIG(x) ((x) != SIGINT && (x) != SIGPIPE && (x) != SIGTERM)
+#elif !defined (DONT_REPORT_SIGPIPE) && !defined (DONT_REPORT_SIGTERM)
+# define REPORTSIG(x) ((x) != SIGINT)
+#elif defined (DONT_REPORT_SIGPIPE)
+# define REPORTSIG(x) ((x) != SIGINT && (x) != SIGPIPE)
#else
- if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) &&
- (WTERMSIG (status) != SIGINT) && (WTERMSIG (status) != SIGPIPE))
+# define REPORTSIG(x) ((x) != SIGINT && (x) != SIGTERM)
#endif
+
+ if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && REPORTSIG(WTERMSIG (status)))
{
- fprintf (stderr, "%s", strsignal (WTERMSIG (status)));
+ fprintf (stderr, "%s", j_strsignal (WTERMSIG (status)));
if (WIFCORED (status))
- fprintf (stderr, " (core dumped)");
+ fprintf (stderr, _(" (core dumped)"));
fprintf (stderr, "\n");
}
else
get_tty_state ();
}
+ else if (interactive_shell == 0 && subshell_environment == 0 && check_window_size)
+ get_new_window_size (0, (int *)0, (int *)0);
return (return_val);
}
-/* 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. */
+/* Send PID SIGNAL. Returns -1 on failure, 0 on success. If GROUP is non-zero,
+ or PID is less than -1, then kill the process group associated with PID. */
int
kill_pid (pid, signal, group)
pid_t pid;
{
int result;
+ if (pid < -1)
+ {
+ pid = -pid;
+ group = 1;
+ }
result = group ? killpg (pid, signal) : kill (pid, signal);
return (result);
}
ttgetattr (tty, &shell_tty_info);
got_tty_state = 1;
if (check_window_size)
- get_new_window_size (0);
+ get_new_window_size (0, (int *)0, (int *)0);
}
}
}
/* Give the terminal to PGRP. */
-give_terminal_to (pgrp)
+give_terminal_to (pgrp, force)
pid_t pgrp;
+ int force;
{
}
/* Stop a pipeline. */
+int
stop_pipeline (async, ignore)
int async;
COMMAND *ignore;
{
already_making_children = 0;
+ return 0;
}
void
already_making_children = 1;
}
+void
+stop_making_children ()
+{
+ already_making_children = 0;
+}
+
int
get_job_by_pid (pid, block)
pid_t pid;
describe_pid (pid)
pid_t pid;
{
- fprintf (stderr, "%d\n", (int) pid);
+ fprintf (stderr, "%ld\n", (long) pid);
+}
+
+void
+freeze_jobs_list ()
+{
}
void
projects / thirdparty / bash.git / blobdiff