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 /*
36 * openchild.c
37 *
38 * Open two pipes to a child process, one for reading, one for writing.
39 * The pipes are accessed by FILE pointers. This is NOT a public
40 * interface, but for internal use only!
41 */
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <strings.h>
45
46 static char *basename(char *);
47 static char SHELL[] = "/bin/sh";
48
49 /*
50 * returns pid, or -1 for failure
51 */
52 int
_openchild(char * command,FILE ** fto,FILE ** ffrom)53 _openchild(char *command, FILE **fto, FILE **ffrom)
54 {
55 int i;
56 int pid;
57 int pdto[2];
58 int pdfrom[2];
59 char *com;
60
61
62 if (pipe(pdto) < 0) {
63 goto error1;
64 }
65 if (pipe(pdfrom) < 0) {
66 goto error2;
67 }
68 switch (pid = fork()) {
69 case -1:
70 goto error3;
71
72 case 0:
73 /*
74 * child: read from pdto[0], write into pdfrom[1]
75 */
76 (void) close(0);
77 (void) dup(pdto[0]);
78 (void) close(1);
79 (void) dup(pdfrom[1]);
80
81 /*
82 * adding this closelog for bug id 1238429
83 */
84 closelog();
85 closefrom(3);
86
87 com = malloc((unsigned)strlen(command) + 6);
88 if (com == NULL) {
89 exit(1);
90 }
91 (void) sprintf(com, "exec %s", command);
92 execl(SHELL, basename(SHELL), "-c", com, NULL);
93 exit(1);
94
95 default:
96 /*
97 * parent: write into pdto[1], read from pdfrom[0]
98 */
99 *fto = fdopen(pdto[1], "w");
100 (void) close(pdto[0]);
101 *ffrom = fdopen(pdfrom[0], "r");
102 (void) close(pdfrom[1]);
103 break;
104 }
105 return (pid);
106
107 /*
108 * error cleanup and return
109 */
110 error3:
111 printf("openchild: error3");
112 (void) close(pdfrom[0]);
113 (void) close(pdfrom[1]);
114 error2:
115 printf("openchild: error2");
116 (void) close(pdto[0]);
117 (void) close(pdto[1]);
118 error1:
119 printf("openchild: error1");
120 return (-1);
121 }
122
123 static char *
basename(char * path)124 basename(char *path)
125 {
126 char *p;
127
128 p = strrchr(path, '/');
129 if (p == NULL) {
130 return (path);
131 } else {
132 return (p + 1);
133 }
134 }
135