2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)system.c 8.1 (Berkeley) 6/4/93";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 #include "namespace.h"
37 #include <sys/types.h>
46 #include "un-namespace.h"
47 #include "libc_private.h"
51 system(const char *command)
54 return (((int (*)(const char *))
55 __libc_interposing[INTERPOS_system])(command));
59 __libc_system(const char *command)
63 struct sigaction ign, intact, quitact;
64 sigset_t newsigblock, oldsigblock;
66 if (!command) /* just checking... */
69 (void)sigemptyset(&newsigblock);
70 (void)sigaddset(&newsigblock, SIGCHLD);
71 (void)sigaddset(&newsigblock, SIGINT);
72 (void)sigaddset(&newsigblock, SIGQUIT);
73 (void)__libc_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
74 switch(pid = vfork()) {
76 * In the child, use unwrapped syscalls. libthr is in
77 * undefined state after vfork().
80 (void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
84 * Restore original signal dispositions and exec the command.
86 (void)__sys_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
87 execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
91 * If we are running means that the child has either completed
92 * its execve, or has failed.
93 * Block SIGINT/QUIT because sh -c handles it and wait for
96 memset(&ign, 0, sizeof(ign));
97 ign.sa_handler = SIG_IGN;
98 (void)sigemptyset(&ign.sa_mask);
99 (void)__libc_sigaction(SIGINT, &ign, &intact);
100 (void)__libc_sigaction(SIGQUIT, &ign, &quitact);
103 pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
104 } while (pid == -1 && errno == EINTR);
105 (void)__libc_sigaction(SIGINT, &intact, NULL);
106 (void)__libc_sigaction(SIGQUIT, &quitact, NULL);
107 (void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
108 return (pid == -1 ? -1 : pstat);
111 __weak_reference(__libc_system, __system);
112 __weak_reference(__libc_system, _system);