1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
This file is suspenddef, from which is created suspendc
It implements the builtin "suspend" in Bash
Copyright (C) 1987-2003 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 suspendc
$BUILTIN suspend
$DEPENDS_ON JOB_CONTROL
$FUNCTION suspend_builtin
$SHORT_DOC suspend [-f]
Suspend the execution of this shell until it receives a SIGCONT
signal The `-f' if specified says not to complain about this
being a login shell if it is; just suspend anyway
$END
#include <configh
#if defined (JOB_CONTROL)
#if defined (HAVE_UNISTD_H)
# ifdef _MINIX
# include <sys/typesh
# endif
# include <unistdh
#endif
#include "../bashtypesh"
#include <signalh
#include "../bashintlh"
#include "../shellh"
#include "../jobsh"
#include "commonh"
#include "bashgetopth"
static SigHandler *old_cont;
#if 0
static SigHandler *old_stop;
#endif
/* Continue handler */
sighandler
suspend_continue (sig)
int sig;
{
set_signal_handler (SIGCONT, old_cont);
#if 0
set_signal_handler (SIGSTOP, old_stop);
#endif
SIGRETURN (0);
}
/* Suspending the shell If -f is the arg, then do the suspend
no matter what Otherwise, complain if a login shell */
int
suspend_builtin (list)
WORD_LIST *list;
{
int opt, force;
reset_internal_getopt ();
force = 0;
while ((opt = internal_getopt (list, "f")) != -1)
switch (opt)
{
case 'f':
force++;
break;
default:
builtin_usage ();
return (EX_USAGE);
}
list = loptend;
if (job_control == 0)
{
sh_nojobs (_("cannot suspend"));
return (EXECUTION_FAILURE);
}
if (force == 0)
{
no_args (list);
if (login_shell)
{
builtin_error (_("cannot suspend a login shell"));
return (EXECUTION_FAILURE);
}
}
/* XXX - should we put ourselves back into the original pgrp now If so,
call end_job_control() here and do the right thing in suspend_continue
(that is, call restart_job_control()). */
old_cont = (SigHandler *)set_signal_handler (SIGCONT, suspend_continue);
#if 0
old_stop = (SigHandler *)set_signal_handler (SIGSTOP, SIG_DFL);
#endif
killpg (shell_pgrp, SIGSTOP);
return (EXECUTION_SUCCESS);
}
#endif /* JOB_CONTROL */
|
