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
|
/*
* Copyright (C) 1996-8 Michael R. Elkins <me@cs.hmc.edu>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "mutt.h"
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
int _mutt_system (const char *cmd, int flags)
{
int rc = -1;
struct sigaction act;
struct sigaction oldcont;
struct sigaction oldtstp;
struct sigaction oldint;
struct sigaction oldquit;
struct sigaction oldchld;
sigset_t set;
pid_t thepid;
/* must block SIGCHLD and ignore SIGINT and SIGQUIT */
act.sa_handler = SIG_IGN;
act.sa_flags = 0;
sigemptyset (&(act.sa_mask));
sigaction (SIGINT, &act, &oldint);
sigaction (SIGQUIT, &act, &oldquit);
if (flags & M_DETACH_PROCESS)
{
act.sa_flags = SA_NOCLDSTOP;
sigaction (SIGCHLD, &act, &oldchld);
act.sa_flags = 0;
}
else
{
sigemptyset (&set);
sigaddset (&set, SIGCHLD);
sigprocmask (SIG_BLOCK, &set, NULL);
}
act.sa_handler = SIG_DFL;
sigaction (SIGTSTP, &act, &oldtstp);
sigaction (SIGCONT, &act, &oldcont);
if ((thepid = fork ()) == 0)
{
/* reset signals for the child */
sigaction (SIGINT, &act, NULL);
sigaction (SIGQUIT, &act, NULL);
if (flags & M_DETACH_PROCESS)
{
setsid ();
switch (fork ())
{
case 0:
sigaction (SIGCHLD, &act, NULL);
break;
case -1:
_exit (127);
default:
_exit (0);
}
}
else
sigprocmask (SIG_UNBLOCK, &set, NULL);
execl (EXECSHELL, "sh", "-c", cmd, NULL);
_exit (127); /* execl error */
}
else if (thepid != -1)
{
/* wait for the child process to finish */
waitpid (thepid, &rc, 0);
}
/* reset SIGINT, SIGQUIT and SIGCHLD */
sigaction (SIGINT, &oldint, NULL);
sigaction (SIGQUIT, &oldquit, NULL);
if (flags & M_DETACH_PROCESS)
sigaction (SIGCHLD, &oldchld, NULL);
else
sigprocmask (SIG_UNBLOCK, &set, NULL);
sigaction (SIGCONT, &oldcont, NULL);
sigaction (SIGTSTP, &oldtstp, NULL);
rc = WIFEXITED (rc) ? WEXITSTATUS (rc) : -1;
return (rc);
}
|
