| 1 | This file is suspend.def, from which is created suspend.c.
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| 2 | It implements the builtin "suspend" in Bash.
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| 3 |
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| 4 | Copyright (C) 1987-2003 Free Software Foundation, Inc.
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| 5 |
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| 6 | This file is part of GNU Bash, the Bourne Again SHell.
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| 7 |
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| 8 | Bash is free software; you can redistribute it and/or modify it under
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| 9 | the terms of the GNU General Public License as published by the Free
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| 10 | Software Foundation; either version 2, or (at your option) any later
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| 11 | version.
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| 12 |
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| 13 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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| 14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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| 16 | for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License along
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| 19 | with Bash; see the file COPYING. If not, write to the Free Software
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| 20 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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| 21 |
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| 22 | $PRODUCES suspend.c
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| 23 |
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| 24 | $BUILTIN suspend
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| 25 | $DEPENDS_ON JOB_CONTROL
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| 26 | $FUNCTION suspend_builtin
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| 27 | $SHORT_DOC suspend [-f]
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| 28 | Suspend the execution of this shell until it receives a SIGCONT
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| 29 | signal. The `-f' if specified says not to complain about this
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| 30 | being a login shell if it is; just suspend anyway.
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| 31 | $END
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| 32 |
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| 33 | #include <config.h>
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| 34 |
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| 35 | #if defined (JOB_CONTROL)
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| 36 | #if defined (HAVE_UNISTD_H)
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| 37 | # ifdef _MINIX
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| 38 | # include <sys/types.h>
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| 39 | # endif
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| 40 | # include <unistd.h>
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| 41 | #endif
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| 42 |
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| 43 | #include "../bashtypes.h"
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| 44 | #include <signal.h>
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| 45 | #include "../bashintl.h"
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| 46 | #include "../shell.h"
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| 47 | #include "../jobs.h"
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| 48 | #include "common.h"
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| 49 | #include "bashgetopt.h"
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| 50 |
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| 51 | static SigHandler *old_cont;
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| 52 | #if 0
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| 53 | static SigHandler *old_stop;
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| 54 | #endif
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| 55 |
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| 56 | /* Continue handler. */
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| 57 | sighandler
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| 58 | suspend_continue (sig)
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| 59 | int sig;
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| 60 | {
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| 61 | set_signal_handler (SIGCONT, old_cont);
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| 62 | #if 0
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| 63 | set_signal_handler (SIGSTOP, old_stop);
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| 64 | #endif
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| 65 | SIGRETURN (0);
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| 66 | }
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| 67 |
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| 68 | /* Suspending the shell. If -f is the arg, then do the suspend
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| 69 | no matter what. Otherwise, complain if a login shell. */
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| 70 | int
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| 71 | suspend_builtin (list)
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| 72 | WORD_LIST *list;
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| 73 | {
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| 74 | int opt, force;
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| 75 |
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| 76 | reset_internal_getopt ();
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| 77 | force = 0;
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| 78 | while ((opt = internal_getopt (list, "f")) != -1)
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| 79 | switch (opt)
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| 80 | {
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| 81 | case 'f':
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| 82 | force++;
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| 83 | break;
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| 84 | default:
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| 85 | builtin_usage ();
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| 86 | return (EX_USAGE);
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| 87 | }
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| 88 |
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| 89 | list = loptend;
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| 90 |
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| 91 | if (job_control == 0)
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| 92 | {
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| 93 | sh_nojobs (_("cannot suspend"));
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| 94 | return (EXECUTION_FAILURE);
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| 95 | }
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| 96 |
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| 97 | if (force == 0)
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| 98 | {
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| 99 | no_args (list);
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| 100 |
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| 101 | if (login_shell)
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| 102 | {
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| 103 | builtin_error (_("cannot suspend a login shell"));
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| 104 | return (EXECUTION_FAILURE);
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| 105 | }
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| 106 | }
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| 107 |
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| 108 | /* XXX - should we put ourselves back into the original pgrp now? If so,
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| 109 | call end_job_control() here and do the right thing in suspend_continue
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| 110 | (that is, call restart_job_control()). */
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| 111 | old_cont = (SigHandler *)set_signal_handler (SIGCONT, suspend_continue);
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| 112 | #if 0
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| 113 | old_stop = (SigHandler *)set_signal_handler (SIGSTOP, SIG_DFL);
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| 114 | #endif
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| 115 | killpg (shell_pgrp, SIGSTOP);
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| 116 | return (EXECUTION_SUCCESS);
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| 117 | }
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| 118 |
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| 119 | #endif /* JOB_CONTROL */
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