system.c - vx32 - Local 9vx git repository for patches.
(HTM) git clone git://r-36.net/vx32
(DIR) Log
(DIR) Files
(DIR) Refs
---
system.c (3311B)
---
1 /*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/types.h>
35 #include <sys/wait.h>
36 #include <signal.h>
37 #include <stdlib.h>
38 #include <stddef.h>
39 #include <unistd.h>
40 #include <errno.h>
41
42 int
43 system(command)
44 const char *command;
45 {
46 pid_t pid, savedpid;
47 int pstat;
48 // struct sigaction ign, intact, quitact;
49 // sigset_t newsigblock, oldsigblock;
50
51 if (!command) /* just checking... */
52 return(1);
53
54 /*
55 * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
56 * existing signal dispositions.
57 */
58 // ign.sa_handler = SIG_IGN;
59 // (void)sigemptyset(&ign.sa_mask);
60 // ign.sa_flags = 0;
61 // (void)_sigaction(SIGINT, &ign, &intact);
62 // (void)_sigaction(SIGQUIT, &ign, &quitact);
63 // (void)sigemptyset(&newsigblock);
64 // (void)sigaddset(&newsigblock, SIGCHLD);
65 // (void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
66 switch(pid = fork()) {
67 case -1: /* error */
68 break;
69 case 0: /* child */
70 /*
71 * Restore original signal dispositions and exec the command.
72 */
73 // (void)_sigaction(SIGINT, &intact, NULL);
74 // (void)_sigaction(SIGQUIT, &quitact, NULL);
75 // (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
76 execl("/bin/sh", "sh", "-c", command, (char *)NULL);
77 _exit(127);
78 default: /* parent */
79 savedpid = pid;
80 do {
81 pid = waitpid(savedpid, &pstat, 0);
82 } while (pid == -1 && errno == EINTR);
83 break;
84 }
85 // (void)_sigaction(SIGINT, &intact, NULL);
86 // (void)_sigaction(SIGQUIT, &quitact, NULL);
87 // (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
88 return(pid == -1 ? -1 : pstat);
89 }