1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1992 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.2 */
31
32 /*LINTLIBRARY*/
33 #include <signal.h>
34 #include <sys/types.h>
35 #include <sys/wait.h>
36 #include <string.h>
37 #include <sys/file.h>
38
39 extern int execl();
40
41 int
system(s)42 system(s)
43 char *s;
44 {
45 int status;
46 pid_t pid, w;
47 register void (*istat)(), (*qstat)();
48 char path[256];
49 char *c;
50
51 while (*s == ' ' || *s == '\t')
52 s++;
53
54 if (strncmp(s, "/usr/ucb", strlen("/usr/ucb")) == 0) {
55 /* check if command is under /usr/ucb, if not
56 * replace /usr/ucb with /usr/bin.
57 */
58 strcpy(path, s);
59 if ((c = strchr(path, ' ')) != NULL)
60 *c ='\0';
61 if (access(path, F_OK) == -1) {
62 strncpy(path, "/usr/bin", strlen("/usr/bin"));
63 if (c != NULL) *c = ' ';
64 s = path;
65 }
66 }
67 else if (strncmp(s, "/bin", strlen("/bin")) == 0 ||
68 strncmp(s, "/usr/bin", strlen("/usr/bin")) == 0) {
69 /* if /usr/bin is specified, first check if the command
70 * exists under /usr/bin, otherwise try /usr/ucb */
71 if (access(path, F_OK) == -1) {
72 strcpy(path, "/usr/ucb");
73 if (strncmp(s, "/bin", strlen("/bin")) == 0)
74 strcat(path, strchr(s+1, '/'));
75 else {
76 c = strchr(s+1, '/');
77 strcat(path, strchr(c+1, '/'));
78 }
79 if (c != NULL) *c = ' ';
80 s = path;
81 }
82 }
83
84 if ((pid = vfork()) == 0) {
85 (void) execl("/bin/sh", "sh", "-c", s, (char *)0);
86 _exit(127);
87 }
88 if (pid == -1) {
89 return (-1);
90 }
91 istat = signal(SIGINT, SIG_IGN);
92 qstat = signal(SIGQUIT, SIG_IGN);
93 w = waitpid(pid, &status, 0);
94 (void) signal(SIGINT, istat);
95 (void) signal(SIGQUIT, qstat);
96 return ((w == -1) ? -1: status);
97 }
98