jobs.h

   1 /* jobs.h -- structures and stuff used by the jobs.c file. */
   2
   3 /* Copyright (C) 1993 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15    for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with Bash; see the file COPYING.  If not, write to the Free Software
  19    Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  20
  21 #if !defined (_JOBS_H_)
  22 #  define _JOBS_H_
  23
  24 #include "quit.h"
  25 #include "siglist.h"
  26
  27 #include "stdc.h"
  28
  29 #include "posixwait.h"
  30
  31 /* Defines controlling the fashion in which jobs are listed. */
  32 #define JLIST_STANDARD       0
  33 #define JLIST_LONG           1
  34 #define JLIST_PID_ONLY       2
  35 #define JLIST_CHANGED_ONLY   3
  36 #define JLIST_NONINTERACTIVE 4
  37
  38 /* I looked it up.  For pretty_print_job ().  The real answer is 24. */
  39 #define LONGEST_SIGNAL_DESC 24
  40
  41 /* We keep an array of jobs.  Each entry in the array is a linked list
  42    of processes that are piped together.  The first process encountered is
  43    the group leader. */
  44
  45 /* Each child of the shell is remembered in a STRUCT PROCESS.  A chain of
  46    such structures is a pipeline.  The chain is circular. */
  47 typedef struct process {
  48   struct process *next; /* Next process in the pipeline.  A circular chain. */
  49   pid_t pid;            /* Process ID. */
  50   WAIT status;          /* The status of this command as returned by wait. */
  51   int running;          /* Non-zero if this process is running. */
  52   char *command;        /* The particular program that is running. */
  53 } PROCESS;
  54
  55 /* A description of a pipeline's state. */
  56 typedef enum { JRUNNING, JSTOPPED, JDEAD, JMIXED } JOB_STATE;
  57 #define JOBSTATE(job) (jobs[(job)]->state)
  58
  59 #define STOPPED(j)      (jobs[(j)]->state == JSTOPPED)
  60 #define RUNNING(j)      (jobs[(j)]->state == JRUNNING)
  61 #define DEADJOB(j)      (jobs[(j)]->state == JDEAD)
  62
  63 /* Values for the FLAGS field in the JOB struct below. */
  64 #define J_FOREGROUND 0x01 /* Non-zero if this is running in the foreground.  */
  65 #define J_NOTIFIED   0x02 /* Non-zero if already notified about job state.   */
  66 #define J_JOBCONTROL 0x04 /* Non-zero if this job started under job control. */
  67 #define J_NOHUP      0x08 /* Don't send SIGHUP to job if shell gets SIGHUP. */
  68
  69 #define IS_FOREGROUND(j)        ((jobs[j]->flags & J_FOREGROUND) != 0)
  70 #define IS_NOTIFIED(j)          ((jobs[j]->flags & J_NOTIFIED) != 0)
  71 #define IS_JOBCONTROL(j)        ((jobs[j]->flags & J_JOBCONTROL) != 0)
  72
  73 typedef struct job {
  74   char *wd;        /* The working directory at time of invocation. */
  75   PROCESS *pipe;   /* The pipeline of processes that make up this job. */
  76   pid_t pgrp;      /* The process ID of the process group (necessary). */
  77   JOB_STATE state; /* The state that this job is in. */
  78   int flags;       /* Flags word: J_NOTIFIED, J_FOREGROUND, or J_JOBCONTROL. */
  79 #if defined (JOB_CONTROL)
  80   COMMAND *deferred;    /* Commands that will execute when this job is done. */
  81   VFunction *j_cleanup; /* Cleanup function to call when job marked JDEAD */
  82   PTR_T cleanarg;       /* Argument passed to (*j_cleanup)() */
  83 #endif /* JOB_CONTROL */
  84 } JOB;
  85
  86 #define NO_JOB  -1      /* An impossible job array index. */
  87 #define DUP_JOB -2      /* A possible return value for get_job_spec (). */
  88
  89 /* A value which cannot be a process ID. */
  90 #define NO_PID (pid_t)-1
  91
  92 /* System calls. */
  93 #if !defined (HAVE_UNISTD_H)
  94 extern pid_t fork (), getpid (), getpgrp ();
  95 #endif /* !HAVE_UNISTD_H */
  96
  97 /* Stuff from the jobs.c file. */
  98 extern pid_t original_pgrp, shell_pgrp, pipeline_pgrp;
  99 extern pid_t last_made_pid, last_asynchronous_pid;
 100 extern int current_job, previous_job;
 101 extern int asynchronous_notification;
 102 extern JOB **jobs;
 103 extern int job_slots;
 104
 105 extern void making_children __P((void));
 106 extern void stop_making_children __P((void));
 107 extern void cleanup_the_pipeline __P((void));
 108 extern void save_pipeline __P((int));
 109 extern void restore_pipeline __P((int));
 110 extern void start_pipeline __P((void));
 111 extern int stop_pipeline __P((int, COMMAND *));
 112
 113 extern void delete_job __P((int, int));
 114 extern void nohup_job __P((int));
 115 extern void delete_all_jobs __P((int));
 116 extern void nohup_all_jobs __P((int));
 117
 118 extern int count_all_jobs __P((void));
 119
 120 extern void terminate_current_pipeline __P((void));
 121 extern void terminate_stopped_jobs __P((void));
 122 extern void hangup_all_jobs __P((void));
 123 extern void kill_current_pipeline __P((void));
 124
 125 #if defined (__STDC__) && defined (pid_t)
 126 extern int get_job_by_pid __P((int, int));
 127 extern void describe_pid __P((int));
 128 #else
 129 extern int get_job_by_pid __P((pid_t, int));
 130 extern void describe_pid __P((pid_t));
 131 #endif
 132
 133 extern void list_one_job __P((JOB *, int, int, int));
 134 extern void list_all_jobs __P((int));
 135 extern void list_stopped_jobs __P((int));
 136 extern void list_running_jobs __P((int));
 137
 138 extern pid_t make_child __P((char *, int));
 139
 140 extern int get_tty_state __P((void));
 141 extern int set_tty_state __P((void));
 142
 143 extern int wait_for_single_pid __P((pid_t));
 144 extern void wait_for_background_pids __P((void));
 145 extern int wait_for __P((pid_t));
 146 extern int wait_for_job __P((int));
 147
 148 extern void notify_and_cleanup __P((void));
 149 extern void reap_dead_jobs __P((void));
 150 extern int start_job __P((int, int));
 151 extern int kill_pid __P((pid_t, int, int));
 152 extern int initialize_job_control __P((int));
 153 extern void initialize_job_signals __P((void));
 154 extern int give_terminal_to __P((pid_t, int));
 155
 156 extern void set_sigwinch_handler __P((void));
 157 extern void unset_sigwinch_handler __P((void));
 158
 159 extern void unfreeze_jobs_list __P((void));
 160 extern int set_job_control __P((int));
 161 extern void without_job_control __P((void));
 162 extern void end_job_control __P((void));
 163 extern void restart_job_control __P((void));
 164 extern void set_sigchld_handler __P((void));
 165 extern void ignore_tty_job_signals __P((void));
 166 extern void default_tty_job_signals __P((void));
 167
 168 #if defined (JOB_CONTROL)
 169 extern int job_control;
 170 #endif
 171
 172 #endif /* _JOBS_H_ */