oldlinux-files/bin/old/bash-1.11/builtins/jobs.def

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

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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"

extern int job_control;
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;

  if (!job_control)
    return (EXECUTION_SUCCESS);

  while (list && (*list->word->word == '-'))
    {
      register char *arg = list->word->word;

      if (strcmp (arg, "-l") == 0)
	form = JLIST_LONG;
      else if (strcmp (arg, "-p") == 0)
	form = JLIST_PID_ONLY;
      else if (strcmp (arg, "-n") == 0)
	form = JLIST_CHANGED_ONLY;
      else if (strcmp (arg, "-x") == 0)
	{
	  if (form != JLIST_STANDARD)
	    {
	      builtin_error ("Other options not allowed with `-x'");
	      return (EXECUTION_FAILURE);
	    }
	  list = list->next;
	  return (execute_list_with_replacements (list));
	}
      else if (strcmp (arg, "--") == 0)
	{
	  list = list->next;
	  break;
	}
      else
	{
	  bad_option (list->word->word);
	  return (EXECUTION_FAILURE);
	}
      list = list->next;
    }

  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);
      else if (job != DUP_JOB)
	list_one_job ((JOB *)NULL, form, 0, job);

      UNBLOCK_CHILD (oset);
      list = list->next;
    }
    return (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 */
	{
	  extern char *itos ();

	  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");
  {
    extern COMMAND *make_bare_simple_command ();
    extern WORD_LIST *copy_word_list ();
    extern void dispose_command ();
    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 */