File: | src/lib/libc/stdlib/system.c |
Warning: | line 64, column 3 This function call is prohibited after a successful vfork |
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1 | /* $OpenBSD: system.c,v 1.13 2022/05/21 00:53:53 millert 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(*__errno()).h> | |||
34 | #include <signal.h> | |||
35 | #include <stdlib.h> | |||
36 | #include <string.h> | |||
37 | #include <unistd.h> | |||
38 | #include <paths.h> | |||
39 | ||||
40 | int | |||
41 | system(const char *command) | |||
42 | { | |||
43 | pid_t pid, cpid; | |||
44 | struct sigaction intsave, quitsave, sa; | |||
45 | sigset_t mask, omask; | |||
46 | int pstat; | |||
47 | char *argp[] = {"sh", "-c", NULL((void *)0), NULL((void *)0)}; | |||
48 | ||||
49 | if (!command) /* just checking... */ | |||
| ||||
50 | return(1); | |||
51 | ||||
52 | argp[2] = (char *)command; | |||
53 | ||||
54 | sigemptyset(&mask); | |||
55 | sigaddset(&mask, SIGCHLD20); | |||
56 | sigaddset(&mask, SIGINT2); | |||
57 | sigaddset(&mask, SIGQUIT3); | |||
58 | sigprocmask(SIG_BLOCK1, &mask, &omask); | |||
59 | switch (cpid = vfork()) { | |||
60 | case -1: /* error */ | |||
61 | sigprocmask(SIG_SETMASK3, &omask, NULL((void *)0)); | |||
62 | return(-1); | |||
63 | case 0: /* child */ | |||
64 | sigprocmask(SIG_SETMASK3, &omask, NULL((void *)0)); | |||
| ||||
65 | execve(_PATH_BSHELL"/bin/sh", argp, environ); | |||
66 | _exit(127); | |||
67 | } | |||
68 | ||||
69 | /* Ignore SIGINT and SIGQUIT while waiting for command to complete. */ | |||
70 | memset(&sa, 0, sizeof(sa)); | |||
71 | sigemptyset(&sa.sa_mask); | |||
72 | sa.sa_handler__sigaction_u.__sa_handler = SIG_IGN(void (*)(int))1; | |||
73 | sigaction(SIGINT2, &sa, &intsave); | |||
74 | sigaction(SIGQUIT3, &sa, &quitsave); | |||
75 | sigemptyset(&mask); | |||
76 | sigaddset(&mask, SIGINT2); | |||
77 | sigaddset(&mask, SIGQUIT3); | |||
78 | sigprocmask(SIG_UNBLOCK2, &mask, NULL((void *)0)); | |||
79 | ||||
80 | do { | |||
81 | pid = waitpid(cpid, &pstat, 0); | |||
82 | } while (pid == -1 && errno(*__errno()) == EINTR4); | |||
83 | ||||
84 | sigprocmask(SIG_SETMASK3, &omask, NULL((void *)0)); | |||
85 | sigaction(SIGINT2, &intsave, NULL((void *)0)); | |||
86 | sigaction(SIGQUIT3, &quitsave, NULL((void *)0)); | |||
87 | return (pid == -1 ? -1 : pstat); | |||
88 | } | |||
89 | DEF_STRONG(system)__asm__(".global " "system" " ; " "system" " = " "_libc_system" ); |