1 This file is fg_bg.def, from which is created fg_bg.c.
2 It implements the builtins "bg" and "fg" in Bash.
4 Copyright (C) 1987-2002 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with Bash; see the file COPYING. If not, write to the Free Software
20 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
26 $DEPENDS_ON JOB_CONTROL
27 $SHORT_DOC fg [job_spec]
28 Place JOB_SPEC in the foreground, and make it the current job. If
29 JOB_SPEC is not present, the shell's notion of the current job is
35 #include "../bashtypes.h"
38 #if defined (HAVE_UNISTD_H)
45 #include "bashgetopt.h"
47 #if defined (JOB_CONTROL)
48 extern char *this_command_name;
50 static int fg_bg __P((WORD_LIST *, int));
52 /* How to bring a job into the foreground. */
58 register WORD_LIST *t;
62 sh_nojobs ((char *)NULL);
63 return (EXECUTION_FAILURE);
66 if (no_options (list))
70 /* If the last arg on the line is '&', then start this job in the
71 background. Else, fg the job. */
72 for (t = list; t && t->next; t = t->next)
74 fg_bit = (t && t->word->word[0] == '&' && t->word->word[1] == '\0') == 0;
76 return (fg_bg (list, fg_bit));
78 #endif /* JOB_CONTROL */
82 $DEPENDS_ON JOB_CONTROL
83 $SHORT_DOC bg [job_spec]
84 Place JOB_SPEC in the background, as if it had been started with
85 `&'. If JOB_SPEC is not present, the shell's notion of the current
89 #if defined (JOB_CONTROL)
90 /* How to put a job into the background. */
97 sh_nojobs ((char *)NULL);
98 return (EXECUTION_FAILURE);
101 if (no_options (list))
105 return (fg_bg (list, 0));
108 /* How to put a job into the foreground/background. */
110 fg_bg (list, foreground)
115 int job, status, old_async_pid;
117 BLOCK_CHILD (set, oset);
118 job = get_job_spec (list);
120 if (job < 0 || job >= job_slots || jobs[job] == 0)
123 sh_badjob (list ? list->word->word : "current");
128 /* Or if jobs[job]->pgrp == shell_pgrp. */
129 if (IS_JOBCONTROL (job) == 0)
131 builtin_error ("job %%%d started without job control", job + 1);
137 old_async_pid = last_asynchronous_pid;
138 last_asynchronous_pid = jobs[job]->pgrp; /* As per Posix.2 5.4.2 */
141 status = start_job (job, foreground);
146 UNBLOCK_CHILD (oset);
152 last_asynchronous_pid = old_async_pid;
155 UNBLOCK_CHILD (oset);
156 return (EXECUTION_FAILURE);
159 #endif /* JOB_CONTROL */