| File: | src/lib/libc/stdlib/system.c |
| Warning: | line 61, column 3 This function call is prohibited after a successful vfork |
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| 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(*__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((void *)0), NULL((void *)0)}; | |||
| 47 | ||||
| 48 | if (!command) /* just checking... */ | |||
| ||||
| 49 | return(1); | |||
| 50 | ||||
| 51 | argp[2] = (char *)command; | |||
| 52 | ||||
| 53 | sigemptyset(&mask); | |||
| 54 | sigaddset(&mask, SIGCHLD20); | |||
| 55 | sigprocmask(SIG_BLOCK1, &mask, &omask); | |||
| 56 | switch (cpid = vfork()) { | |||
| 57 | case -1: /* error */ | |||
| 58 | sigprocmask(SIG_SETMASK3, &omask, NULL((void *)0)); | |||
| 59 | return(-1); | |||
| 60 | case 0: /* child */ | |||
| 61 | sigprocmask(SIG_SETMASK3, &omask, NULL((void *)0)); | |||
| ||||
| 62 | execve(_PATH_BSHELL"/bin/sh", argp, environ); | |||
| 63 | _exit(127); | |||
| 64 | } | |||
| 65 | ||||
| 66 | sigaction(SIGINT2, NULL((void *)0), &intsave); | |||
| 67 | sigaction(SIGQUIT3, NULL((void *)0), &quitsave); | |||
| 68 | do { | |||
| 69 | pid = waitpid(cpid, &pstat, 0); | |||
| 70 | } while (pid == -1 && errno(*__errno()) == EINTR4); | |||
| 71 | sigprocmask(SIG_SETMASK3, &omask, NULL((void *)0)); | |||
| 72 | sigaction(SIGINT2, &intsave, NULL((void *)0)); | |||
| 73 | sigaction(SIGQUIT3, &quitsave, NULL((void *)0)); | |||
| 74 | return (pid == -1 ? -1 : pstat); | |||
| 75 | } | |||
| 76 | DEF_STRONG(system)__asm__(".global " "system" " ; " "system" " = " "_libc_system" ); |