161 lines
3.6 KiB
Modula-2
161 lines
3.6 KiB
Modula-2
This file is fg_bg.def, from which is created fg_bg.c.
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It implements the builtins "bg" and "fg" in Bash.
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Copyright (C) 1987-2003 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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$PRODUCES fg_bg.c
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$BUILTIN fg
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$FUNCTION fg_builtin
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$DEPENDS_ON JOB_CONTROL
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$SHORT_DOC fg [job_spec]
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Place JOB_SPEC in the foreground, and make it the current job. If
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JOB_SPEC is not present, the shell's notion of the current job is
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used.
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$END
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#include <config.h>
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#include "../bashtypes.h"
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#include <signal.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include "../bashintl.h"
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#include "../shell.h"
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#include "../jobs.h"
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#include "common.h"
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#include "bashgetopt.h"
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#if defined (JOB_CONTROL)
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extern char *this_command_name;
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static int fg_bg __P((WORD_LIST *, int));
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/* How to bring a job into the foreground. */
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int
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fg_builtin (list)
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WORD_LIST *list;
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{
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int fg_bit;
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register WORD_LIST *t;
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if (job_control == 0)
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{
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sh_nojobs ((char *)NULL);
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return (EXECUTION_FAILURE);
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}
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if (no_options (list))
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return (EX_USAGE);
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list = loptend;
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/* If the last arg on the line is '&', then start this job in the
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background. Else, fg the job. */
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for (t = list; t && t->next; t = t->next)
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;
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fg_bit = (t && t->word->word[0] == '&' && t->word->word[1] == '\0') == 0;
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return (fg_bg (list, fg_bit));
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}
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#endif /* JOB_CONTROL */
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$BUILTIN bg
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$FUNCTION bg_builtin
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$DEPENDS_ON JOB_CONTROL
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$SHORT_DOC bg [job_spec]
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Place JOB_SPEC in the background, as if it had been started with
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`&'. If JOB_SPEC is not present, the shell's notion of the current
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job is used.
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$END
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#if defined (JOB_CONTROL)
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/* How to put a job into the background. */
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int
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bg_builtin (list)
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WORD_LIST *list;
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{
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if (job_control == 0)
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{
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sh_nojobs ((char *)NULL);
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return (EXECUTION_FAILURE);
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}
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if (no_options (list))
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return (EX_USAGE);
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list = loptend;
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return (fg_bg (list, 0));
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}
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/* How to put a job into the foreground/background. */
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static int
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fg_bg (list, foreground)
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WORD_LIST *list;
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int foreground;
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{
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sigset_t set, oset;
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int job, status, old_async_pid;
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BLOCK_CHILD (set, oset);
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job = get_job_spec (list);
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if (job < 0 || job >= job_slots || jobs[job] == 0)
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{
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if (job != DUP_JOB)
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sh_badjob (list ? list->word->word : "current");
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goto failure;
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}
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/* Or if jobs[job]->pgrp == shell_pgrp. */
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if (IS_JOBCONTROL (job) == 0)
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{
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builtin_error (_("job %d started without job control"), job + 1);
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goto failure;
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}
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if (foreground == 0)
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{
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old_async_pid = last_asynchronous_pid;
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last_asynchronous_pid = jobs[job]->pgrp; /* As per Posix.2 5.4.2 */
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}
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status = start_job (job, foreground);
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if (status >= 0)
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{
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/* win: */
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UNBLOCK_CHILD (oset);
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return (status);
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}
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else
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{
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if (foreground == 0)
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last_asynchronous_pid = old_async_pid;
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failure:
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UNBLOCK_CHILD (oset);
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return (EXECUTION_FAILURE);
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}
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}
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#endif /* JOB_CONTROL */
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