1 |
|
|
/* $OpenBSD: system.c,v 1.12 2016/03/13 18:34:21 guenther Exp $ */ |
2 |
|
|
/* |
3 |
|
|
* Copyright (c) 1988 The Regents of the University of California. |
4 |
|
|
* All rights reserved. |
5 |
|
|
* |
6 |
|
|
* Redistribution and use in source and binary forms, with or without |
7 |
|
|
* modification, are permitted provided that the following conditions |
8 |
|
|
* are met: |
9 |
|
|
* 1. Redistributions of source code must retain the above copyright |
10 |
|
|
* notice, this list of conditions and the following disclaimer. |
11 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
12 |
|
|
* notice, this list of conditions and the following disclaimer in the |
13 |
|
|
* documentation and/or other materials provided with the distribution. |
14 |
|
|
* 3. Neither the name of the University nor the names of its contributors |
15 |
|
|
* may be used to endorse or promote products derived from this software |
16 |
|
|
* without specific prior written permission. |
17 |
|
|
* |
18 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
19 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
20 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
21 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
22 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
23 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
24 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
25 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
26 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
27 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
28 |
|
|
* SUCH DAMAGE. |
29 |
|
|
*/ |
30 |
|
|
|
31 |
|
|
#include <sys/types.h> |
32 |
|
|
#include <sys/wait.h> |
33 |
|
|
#include <errno.h> |
34 |
|
|
#include <signal.h> |
35 |
|
|
#include <stdlib.h> |
36 |
|
|
#include <unistd.h> |
37 |
|
|
#include <paths.h> |
38 |
|
|
|
39 |
|
|
int |
40 |
|
|
system(const char *command) |
41 |
|
|
{ |
42 |
|
|
pid_t pid, cpid; |
43 |
|
|
struct sigaction intsave, quitsave; |
44 |
|
|
sigset_t mask, omask; |
45 |
|
|
int pstat; |
46 |
|
|
char *argp[] = {"sh", "-c", NULL, NULL}; |
47 |
|
|
|
48 |
|
|
if (!command) /* just checking... */ |
49 |
|
|
return(1); |
50 |
|
|
|
51 |
|
|
argp[2] = (char *)command; |
52 |
|
|
|
53 |
|
|
sigemptyset(&mask); |
54 |
|
|
sigaddset(&mask, SIGCHLD); |
55 |
|
|
sigprocmask(SIG_BLOCK, &mask, &omask); |
56 |
|
|
switch (cpid = vfork()) { |
57 |
|
|
case -1: /* error */ |
58 |
|
|
sigprocmask(SIG_SETMASK, &omask, NULL); |
59 |
|
|
return(-1); |
60 |
|
|
case 0: /* child */ |
61 |
|
|
sigprocmask(SIG_SETMASK, &omask, NULL); |
62 |
|
|
execve(_PATH_BSHELL, argp, environ); |
63 |
|
|
_exit(127); |
64 |
|
|
} |
65 |
|
|
|
66 |
|
|
sigaction(SIGINT, NULL, &intsave); |
67 |
|
|
sigaction(SIGQUIT, NULL, &quitsave); |
68 |
|
|
do { |
69 |
|
|
pid = waitpid(cpid, &pstat, 0); |
70 |
|
|
} while (pid == -1 && errno == EINTR); |
71 |
|
|
sigprocmask(SIG_SETMASK, &omask, NULL); |
72 |
|
|
sigaction(SIGINT, &intsave, NULL); |
73 |
|
|
sigaction(SIGQUIT, &quitsave, NULL); |
74 |
|
|
return (pid == -1 ? -1 : pstat); |
75 |
|
|
} |
76 |
|
|
DEF_STRONG(system); |