i-bash/builtins/jobs.def

This file is jobs.def, from which is created jobs.c.
It implements the builtin "jobs" 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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$PRODUCES jobs.c

$BUILTIN jobs
$FUNCTION jobs_builtin
$DEPENDS_ON JOB_CONTROL
$SHORT_DOC jobs [-lnp] [jobspec ...] | 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.
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 "../shell.h"

#if defined (JOB_CONTROL)
#include <sys/types.h>
#include <signal.h>
#include "../jobs.h"

#include "bashgetopt.h"

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. */
int
jobs_builtin (list)
     WORD_LIST *list;
{
  int form = JLIST_STANDARD, execute = 0;
  int opt;
  int any_failed = 0;

  if (!job_control && !interactive_shell)
    return (EXECUTION_SUCCESS);

  reset_internal_getopt ();
  while ((opt = internal_getopt (list, "lpnx")) != -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;

	default:
	  builtin_error ("usage: jobs [-lpn [jobspec]] [-x command [args]]");
	  return (EX_USAGE);
	}
    }

  list = loptend;

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

  if (!list)
    {
      list_jobs (form);
      return (EXECUTION_SUCCESS);
    }

  while (list)
    {
      int job;
      sigset_t set, oset;

      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 */