1 /* xsystem.c - system(3) with error messages
2
3 Carl D. Worth
4
5 Copyright (C) 2001 University of Southern California
6
7 This program is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public License as
9 published by the Free Software Foundation; either version 2, or (at
10 your option) any later version.
11
12 This program is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
16 */
17
18 #include <sys/types.h>
19 #include <sys/wait.h>
20 #include <unistd.h>
21
22 #include "xsystem.h"
23 #include "libbb/libbb.h"
24
25 /* Like system(3), but with error messages printed if the fork fails
26 or if the child process dies due to an uncaught signal. Also, the
27 return value is a bit simpler:
28
29 -1 if there was any problem
30 Otherwise, the 8-bit return value of the program ala WEXITSTATUS
31 as defined in <sys/wait.h>.
32 */
xsystem(const char * argv[])33 int xsystem(const char *argv[])
34 {
35 int status;
36 pid_t pid;
37
38 pid = vfork();
39
40 switch (pid) {
41 case -1:
42 opkg_perror(ERROR, "%s: vfork", argv[0]);
43 return -1;
44 case 0:
45 /* child */
46 execvp(argv[0], (char *const *)argv);
47 _exit(-1);
48 default:
49 /* parent */
50 break;
51 }
52
53 if (waitpid(pid, &status, 0) == -1) {
54 opkg_perror(ERROR, "%s: waitpid", argv[0]);
55 return -1;
56 }
57
58 if (WIFSIGNALED(status)) {
59 opkg_msg(ERROR, "%s: Child killed by signal %d.\n",
60 argv[0], WTERMSIG(status));
61 return -1;
62 }
63
64 if (!WIFEXITED(status)) {
65 /* shouldn't happen */
66 opkg_msg(ERROR, "%s: Your system is broken: got status %d "
67 "from waitpid.\n", argv[0], status);
68 return -1;
69 }
70
71 return WEXITSTATUS(status);
72 }
73