source: trunk/essentials/app-shells/bash/builtins/jobs.def

This file is jobs.def, from which is created jobs.c.
It implements the builtins "jobs" and "disown" in Bash.

Copyright (C) 1987-2005 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 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.

$PRODUCES jobs.c

$BUILTIN jobs
$FUNCTION jobs_builtin
$DEPENDS_ON JOB_CONTROL
$SHORT_DOC jobs [-lnprs] [jobspec ...] or jobs -x command [args]
Lists the active jobs.  The -l option lists process id's in addition
to the normal information; the -p option lists process id's only.
If -n is given, only processes that have changed status since the last
notification are printed.  JOBSPEC restricts output to that job.  The
-r and -s options restrict output to running and stopped jobs only,
respectively.  Without options, the status of all active jobs is
printed.  If -x is given, COMMAND is run after all job specifications
that appear in ARGS have been replaced with the process ID of that job's
process group leader.
$END

#include <config.h>

#if defined (JOB_CONTROL)
#include "../bashtypes.h"
#include <signal.h>
#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include "../bashansi.h"
#include "../bashintl.h"

#include "../shell.h"
#include "../jobs.h"
#include "../execute_cmd.h"
#include "bashgetopt.h"
#include "common.h"

#define JSTATE_ANY      0x0
#define JSTATE_RUNNING  0x1
#define JSTATE_STOPPED  0x2

static int execute_list_with_replacements __P((WORD_LIST *));

/* The `jobs' command.  Prints outs a list of active jobs.  If the
   argument `-l' is given, then the process id's are printed also.
   If the argument `-p' is given, print the process group leader's
   pid only.  If `-n' is given, only processes that have changed
   status since the last notification are printed.  If -x is given,
   replace all job specs with the pid of the appropriate process
   group leader and execute the command.  The -r and -s options mean
   to print info about running and stopped jobs only, respectively. */
int
jobs_builtin (list)
     WORD_LIST *list;
{
  int form, execute, state, opt, any_failed, job;
  sigset_t set, oset;

  execute = any_failed = 0;
  form = JLIST_STANDARD;
  state = JSTATE_ANY;

  reset_internal_getopt ();
  while ((opt = internal_getopt (list, "lpnxrs")) != -1)
    {
      switch (opt)
        {
        case 'l':
          form = JLIST_LONG;
          break;
        case 'p':
          form = JLIST_PID_ONLY;
          break;
        case 'n':
          form = JLIST_CHANGED_ONLY;
          break;
        case 'x':
          if (form != JLIST_STANDARD)
            {
              builtin_error (_("no other options allowed with `-x'"));
              return (EXECUTION_FAILURE);
            }
          execute++;
          break;
        case 'r':
          state = JSTATE_RUNNING;
          break;
        case 's':
          state = JSTATE_STOPPED;
          break;

        default:
          builtin_usage ();
          return (EX_USAGE);
        }
    }

  list = loptend;

  if (execute)
    return (execute_list_with_replacements (list));

  if (!list)
    {
      switch (state)
        {
        case JSTATE_ANY:
          list_all_jobs (form);
          break;
        case JSTATE_RUNNING:
          list_running_jobs (form);
          break;
        case JSTATE_STOPPED:
          list_stopped_jobs (form);
          break;
        }
      return (EXECUTION_SUCCESS);
    }

  while (list)
    {
      BLOCK_CHILD (set, oset);
      job = get_job_spec (list);

      if ((job == NO_JOB) || jobs == 0 || get_job_by_jid (job) == 0)
        {
          sh_badjob (list->word->word);
          any_failed++;
        }
      else if (job != DUP_JOB)
        list_one_job ((JOB *)NULL, form, 0, job);

      UNBLOCK_CHILD (oset);
      list = list->next;
    }
  return (any_failed ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
}

static int
execute_list_with_replacements (list)
     WORD_LIST *list;
{
  register WORD_LIST *l;
  int job, result;
  COMMAND *command;
  JOB *j;

  /* First do the replacement of job specifications with pids. */
  for (l = list; l; l = l->next)
    {
      if (l->word->word[0] == '%')      /* we have a winner */
        {
          job = get_job_spec (l);

          /* A bad job spec is not really a job spec! Pass it through. */
          if (INVALID_JOB (job))
            continue;

          j = get_job_by_jid (job);
          free (l->word->word);
          l->word->word = itos (j->pgrp);
        }
    }

  /* Next make a new simple command and execute it. */
  begin_unwind_frame ("jobs_builtin");

  command = make_bare_simple_command ();
  command->value.Simple->words = copy_word_list (list);
  command->value.Simple->redirects = (REDIRECT *)NULL;
  command->flags |= CMD_INHIBIT_EXPANSION;
  command->value.Simple->flags |= CMD_INHIBIT_EXPANSION;

  add_unwind_protect (dispose_command, command);
  result = execute_command (command);
  dispose_command (command);

  discard_unwind_frame ("jobs_builtin");
  return (result);
}
#endif /* JOB_CONTROL */

$BUILTIN disown
$FUNCTION disown_builtin
$DEPENDS_ON JOB_CONTROL
$SHORT_DOC disown [-h] [-ar] [jobspec ...]
By default, removes each JOBSPEC argument from the table of active jobs.
If the -h option is given, the job is not removed from the table, but is
marked so that SIGHUP is not sent to the job if the shell receives a
SIGHUP.  The -a option, when JOBSPEC is not supplied, means to remove all
jobs from the job table; the -r option means to remove only running jobs.
$END

#if defined (JOB_CONTROL)
int
disown_builtin (list)
     WORD_LIST *list;
{
  int opt, job, retval, nohup_only, running_jobs, all_jobs;
  sigset_t set, oset;
  intmax_t pid_value;

  nohup_only = running_jobs = all_jobs = 0;
  reset_internal_getopt ();
  while ((opt = internal_getopt (list, "ahr")) != -1)
    {
      switch (opt)
        {
        case 'a':
          all_jobs = 1;
          break;
        case 'h':
          nohup_only = 1;
          break;
        case 'r':
          running_jobs = 1;
          break;
        default:
          builtin_usage ();
          return (EX_USAGE);
        }
    }
  list = loptend;
  retval = EXECUTION_SUCCESS;

  /* `disown -a' or `disown -r' */
  if (list == 0 && (all_jobs || running_jobs))
    {
      if (nohup_only)
        nohup_all_jobs (running_jobs);
      else
        delete_all_jobs (running_jobs);
      return (EXECUTION_SUCCESS);
    }

  do
    {
      BLOCK_CHILD (set, oset);
      job = (list && legal_number (list->word->word, &pid_value) && pid_value == (pid_t) pid_value)
                ? get_job_by_pid ((pid_t) pid_value, 0)
                : get_job_spec (list);

      if (job == NO_JOB || jobs == 0 || INVALID_JOB (job))
        {
          sh_badjob (list ? list->word->word : "current");
          retval = EXECUTION_FAILURE;
        }
      else if (nohup_only)
        nohup_job (job);
      else
        delete_job (job, 1);
      UNBLOCK_CHILD (oset);

      if (list)
        list = list->next;
    }
  while (list);

  return (retval);
}
#endif /* JOB_CONTROL */