i-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, 1989, 1991, 1992 Free Software Foundation, Inc.

This file is part of GNU Bash, the Bourne Again SHell.

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the terms of the GNU General Public License as published by the Free
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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, 675 Mass Ave, Cambridge, MA 02139, 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 "../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

extern int job_control, interactive_shell;
static int execute_list_with_replacements ();

/* 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;

  if (job_control == 0 && interactive_shell == 0)
    return (EXECUTION_SUCCESS);

  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 ("Other options not 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 || !jobs[job])
	{
	  builtin_error ("no such job %s", 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;

  /* 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 (job < 0 || job >= job_slots || !jobs[job])
	    continue;

	  free (l->word->word);
	  l->word->word = itos (jobs[job]->pgrp);
	}
    }

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

    add_unwind_protect (dispose_command, command);

    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;

    result = execute_command (command);
  }

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

$BUILTIN disown
$FUNCTION disown_builtin
$DEPENDS_ON JOB_CONTROL
$SHORT_DOC disown [-h] [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.
$END

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

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

#if 0
  /* For the future `disown -a' */
  if (list == 0)
    {
      if (nohup_only)
	nohup_all_jobs ();
      else
	delete_all_jobs ();
      return (EXECUTION_SUCCESS);
    }
#endif

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

      if (job == NO_JOB || jobs == 0 || jobs[job] == 0)
	{
	  builtin_error ("%s: no such job", list ? list->word->word : "current");
	  retval = EXECUTION_FAILURE;
	}
      else if (nohup_only)
	nohup_job (job);
      else
	delete_job (job);
      UNBLOCK_CHILD (oset);

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

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