1 This file is suspend.def, from which is created suspend.c.
2 It implements the builtin "suspend" in Bash.
4 Copyright (C) 1987, 1989, 1991 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.
25 $DEPENDS_ON JOB_CONTROL
26 $FUNCTION suspend_builtin
27 $SHORT_DOC suspend [-f]
28 Suspend the execution of this shell until it receives a SIGCONT
29 signal. The `-f' if specified says not to complain about this
30 being a login shell if it is; just suspend anyway.
35 #if defined (JOB_CONTROL)
36 #if defined (HAVE_UNISTD_H)
40 #include "../bashtypes.h"
45 #include "bashgetopt.h"
47 extern int job_control;
49 static SigHandler *old_cont, *old_stop;
51 /* Continue handler. */
53 suspend_continue (sig)
56 set_signal_handler (SIGCONT, old_cont);
58 set_signal_handler (SIGSTOP, old_stop);
63 /* Suspending the shell. If -f is the arg, then do the suspend
64 no matter what. Otherwise, complain if a login shell. */
66 suspend_builtin (list)
71 reset_internal_getopt ();
73 while ((opt = internal_getopt (list, "f")) != -1)
88 builtin_error ("cannot suspend a shell without job control");
89 return (EXECUTION_FAILURE);
98 builtin_error ("cannot suspend a login shell");
99 return (EXECUTION_FAILURE);
103 old_cont = (SigHandler *)set_signal_handler (SIGCONT, suspend_continue);
105 old_stop = (SigHandler *)set_signal_handler (SIGSTOP, SIG_DFL);
107 killpg (shell_pgrp, SIGSTOP);
108 return (EXECUTION_SUCCESS);
111 #endif /* JOB_CONTROL */