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 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
35 #pragma ident "%Z%%M% %I% %E% SMI"
36
37 #if !defined(lint) && defined(SCCSIDS)
38 static char sccsid[] = "%Z%%M% %I% %E% SMI";
39 #endif
40
41 /*
42 * openchild.c
43 *
44 * Open two pipes to a child process, one for reading, one for writing.
45 * The pipes are accessed by FILE pointers. This is NOT a public
46 * interface, but for internal use only!
47 */
48 #include <stdio.h>
49
50 extern void *malloc();
51 extern char *strrchr();
52
53 static char *basename();
54 static char SHELL[] = "/bin/sh";
55
56 extern int close();
57 extern int dup();
58 extern int execl();
59 extern void exit();
60 extern long fork();
61 extern int pipe();
62 extern unsigned int strlen();
63
64 /*
65 * returns pid, or -1 for failure
66 */
67 int
_openchild(command,fto,ffrom)68 _openchild(command, fto, ffrom)
69 char *command;
70 FILE **fto;
71 FILE **ffrom;
72 {
73 int i;
74 int pid;
75 int pdto[2];
76 int pdfrom[2];
77 char *com;
78
79
80 if (pipe(pdto) < 0) {
81 goto error1;
82 }
83 if (pipe(pdfrom) < 0) {
84 goto error2;
85 }
86 switch (pid = fork()) {
87 case -1:
88 goto error3;
89
90 case 0:
91 /*
92 * child: read from pdto[0], write into pdfrom[1]
93 */
94 (void) close(0);
95 (void) dup(pdto[0]);
96 (void) close(1);
97 (void) dup(pdfrom[1]);
98
99 /*
100 * adding this closelog for bug id 1238429
101 */
102 closelog();
103 closefrom(3);
104
105 com = malloc((unsigned)strlen(command) + 6);
106 if (com == NULL) {
107 exit(1);
108 }
109 (void) sprintf(com, "exec %s", command);
110 execl(SHELL, basename(SHELL), "-c", com, NULL);
111 exit(1);
112
113 default:
114 /*
115 * parent: write into pdto[1], read from pdfrom[0]
116 */
117 *fto = fdopen(pdto[1], "w");
118 (void) close(pdto[0]);
119 *ffrom = fdopen(pdfrom[0], "r");
120 (void) close(pdfrom[1]);
121 break;
122 }
123 return (pid);
124
125 /*
126 * error cleanup and return
127 */
128 error3:
129 printf("openchild: error3");
130 (void) close(pdfrom[0]);
131 (void) close(pdfrom[1]);
132 error2:
133 printf("openchild: error2");
134 (void) close(pdto[0]);
135 (void) close(pdto[1]);
136 error1:
137 printf("openchild: error1");
138 return (-1);
139 }
140
141 static char *
basename(path)142 basename(path)
143 char *path;
144 {
145 char *p;
146
147 p = strrchr(path, '/');
148 if (p == NULL) {
149 return (path);
150 } else {
151 return (p + 1);
152 }
153 }
154