From b7fc9e0f6d6105ba2203f219743d4b269415e84b Mon Sep 17 00:00:00 2001
From: An-Cheng Huang <ancheng@vyatta.com>
Date: Mon, 12 Nov 2007 13:06:02 -0800
Subject: initial import from bash_3.1dfsg.orig.tar.gz

---
 builtins/fg_bg.def | 177 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 177 insertions(+)
 create mode 100644 builtins/fg_bg.def

(limited to 'builtins/fg_bg.def')

diff --git a/builtins/fg_bg.def b/builtins/fg_bg.def
new file mode 100644
index 0000000..c14381b
--- /dev/null
+++ b/builtins/fg_bg.def
@@ -0,0 +1,177 @@
+This file is fg_bg.def, from which is created fg_bg.c.
+It implements the builtins "bg" and "fg" in Bash.
+
+Copyright (C) 1987-2005 Free Software Foundation, Inc.
+
+This file is part of GNU Bash, the Bourne Again SHell.
+
+Bash is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+Bash is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+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, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
+
+$PRODUCES fg_bg.c
+
+$BUILTIN fg
+$FUNCTION fg_builtin
+$DEPENDS_ON JOB_CONTROL
+$SHORT_DOC fg [job_spec]
+Place JOB_SPEC in the foreground, and make it the current job.  If
+JOB_SPEC is not present, the shell's notion of the current job is
+used.
+$END
+
+#include <config.h>
+
+#include "../bashtypes.h"
+#include <signal.h>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include "../bashintl.h"
+
+#include "../shell.h"
+#include "../jobs.h"
+#include "common.h"
+#include "bashgetopt.h"
+
+#if defined (JOB_CONTROL)
+extern char *this_command_name;
+
+static int fg_bg __P((WORD_LIST *, int));
+
+/* How to bring a job into the foreground. */
+int
+fg_builtin (list)
+     WORD_LIST *list;
+{
+  int fg_bit;
+  register WORD_LIST *t;
+
+  if (job_control == 0)
+    {
+      sh_nojobs ((char *)NULL);
+      return (EXECUTION_FAILURE);
+    }
+
+  if (no_options (list))
+    return (EX_USAGE);
+  list = loptend;
+
+  /* If the last arg on the line is '&', then start this job in the
+     background.  Else, fg the job. */
+  for (t = list; t && t->next; t = t->next)
+    ;
+  fg_bit = (t && t->word->word[0] == '&' && t->word->word[1] == '\0') == 0;
+
+  return (fg_bg (list, fg_bit));
+}
+#endif /* JOB_CONTROL */
+
+$BUILTIN bg
+$FUNCTION bg_builtin
+$DEPENDS_ON JOB_CONTROL
+$SHORT_DOC bg [job_spec ...]
+Place each JOB_SPEC in the background, as if it had been started with
+`&'.  If JOB_SPEC is not present, the shell's notion of the current
+job is used.
+$END
+
+#if defined (JOB_CONTROL)
+/* How to put a job into the background. */
+int
+bg_builtin (list)
+     WORD_LIST *list;
+{
+  int r;
+
+  if (job_control == 0)
+    {
+      sh_nojobs ((char *)NULL);
+      return (EXECUTION_FAILURE);
+    }
+
+  if (no_options (list))
+    return (EX_USAGE);
+  list = loptend;
+
+  /* This relies on the fact that fg_bg() takes a WORD_LIST *, but only acts
+     on the first member (if any) of that list. */
+  r = EXECUTION_SUCCESS;
+  do
+    {
+      if (fg_bg (list, 0) == EXECUTION_FAILURE)
+	r = EXECUTION_FAILURE;
+      if (list)
+	list = list->next;
+    }
+  while (list);
+
+  return r;
+}
+
+/* How to put a job into the foreground/background. */
+static int
+fg_bg (list, foreground)
+     WORD_LIST *list;
+     int foreground;
+{
+  sigset_t set, oset;
+  int job, status, old_async_pid;
+  JOB *j;
+
+  BLOCK_CHILD (set, oset);
+  job = get_job_spec (list);
+
+  if (INVALID_JOB (job))
+    {
+      if (job != DUP_JOB)
+	sh_badjob (list ? list->word->word : "current");
+
+      goto failure;
+    }
+
+  j = get_job_by_jid (job);
+  /* Or if j->pgrp == shell_pgrp. */
+  if (IS_JOBCONTROL (job) == 0)
+    {
+      builtin_error (_("job %d started without job control"), job + 1);
+      goto failure;
+    }
+
+  if (foreground == 0)
+    {
+      old_async_pid = last_asynchronous_pid;
+      last_asynchronous_pid = j->pgrp;	/* As per Posix.2 5.4.2 */
+    }
+
+  status = start_job (job, foreground);
+
+  if (status >= 0)
+    {
+    /* win: */
+      UNBLOCK_CHILD (oset);
+      return (foreground ? status : EXECUTION_SUCCESS);
+    }
+  else
+    {
+      if (foreground == 0)
+	last_asynchronous_pid = old_async_pid;
+
+    failure:
+      UNBLOCK_CHILD (oset);
+      return (EXECUTION_FAILURE);
+    }
+}
+#endif /* JOB_CONTROL */
-- 
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