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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 /*
33 * Similar to popen(3S) but with pipe to cmd's stdin and from stdout.
34 */
35
36 #include <sys/types.h>
37 #include <libgen.h>
38 #include <stdio.h>
39 #include <signal.h>
40 #include <fcntl.h>
41 #include <unistd.h>
42 #include <sys/wait.h>
43 #include <errno.h>
44 #include "lib_gen.h"
45
46 /* functions in libc */
47 extern int _insert(pid_t pid, int fd);
48 extern pid_t _delete(int fd);
49
50 int
p2open(const char * cmd,FILE * fp[2])51 p2open(const char *cmd, FILE *fp[2])
52 {
53 int fds[2];
54
55 if (__p2open(cmd, fds) == -1)
56 return (-1);
57
58 fp[0] = fdopen(fds[0], "w");
59 fp[1] = fdopen(fds[1], "r");
60 return (0);
61 }
62
63 int
p2close(FILE * fp[2])64 p2close(FILE *fp[2])
65 {
66 return (__p2close(NULL, fp, 0));
67 }
68
69 int
__p2open(const char * cmd,int fds[2])70 __p2open(const char *cmd, int fds[2])
71 {
72 int tocmd[2];
73 int fromcmd[2];
74 pid_t pid;
75
76 if (pipe(tocmd) < 0 || pipe(fromcmd) < 0)
77 return (-1);
78 #ifndef _LP64
79 if (tocmd[1] >= 256 || fromcmd[0] >= 256) {
80 (void) close(tocmd[0]);
81 (void) close(tocmd[1]);
82 (void) close(fromcmd[0]);
83 (void) close(fromcmd[1]);
84 return (-1);
85 }
86 #endif /* _LP64 */
87 if ((pid = fork()) == 0) {
88 (void) close(tocmd[1]);
89 (void) close(0);
90 (void) fcntl(tocmd[0], F_DUPFD, 0);
91 (void) close(tocmd[0]);
92 (void) close(fromcmd[0]);
93 (void) close(1);
94 (void) fcntl(fromcmd[1], F_DUPFD, 1);
95 (void) close(fromcmd[1]);
96 (void) execl("/bin/sh", "sh", "-c", cmd, 0);
97 _exit(1);
98 }
99 if (pid == (pid_t)-1)
100 return (-1);
101 (void) _insert(pid, tocmd[1]);
102 (void) _insert(pid, fromcmd[0]);
103 (void) close(tocmd[0]);
104 (void) close(fromcmd[1]);
105 fds[0] = tocmd[1];
106 fds[1] = fromcmd[0];
107 return (0);
108 }
109
110 int
__p2close(int * fdp,FILE ** fpp,int kill_sig)111 __p2close(int *fdp, FILE **fpp, int kill_sig)
112 {
113 int fds[2];
114 int status;
115 void (*hstat)(int), (*istat)(int), (*qstat)(int);
116 pid_t pid, r;
117
118 if (fdp != NULL) {
119 fds[0] = fdp[0];
120 fds[1] = fdp[1];
121 } else if (fpp != NULL) {
122 fds[0] = fileno(fpp[0]);
123 fds[1] = fileno(fpp[1]);
124 } else {
125 return (-1);
126 }
127
128 pid = _delete(fds[0]);
129 if (pid != _delete(fds[1]))
130 return (-1);
131
132 if (pid == (pid_t)-1)
133 return (-1);
134
135 if (kill_sig != 0) {
136 (void) kill(pid, kill_sig);
137 }
138
139 if (fdp != NULL) {
140 (void) close(fds[0]);
141 (void) close(fds[1]);
142 } else {
143 (void) fclose(fpp[0]);
144 (void) fclose(fpp[1]);
145 }
146
147 istat = signal(SIGINT, SIG_IGN);
148 qstat = signal(SIGQUIT, SIG_IGN);
149 hstat = signal(SIGHUP, SIG_IGN);
150 while ((r = waitpid(pid, &status, 0)) == (pid_t)-1 && errno == EINTR)
151 ;
152 if (r == (pid_t)-1)
153 status = -1;
154 (void) signal(SIGINT, istat);
155 (void) signal(SIGQUIT, qstat);
156 (void) signal(SIGHUP, hstat);
157 return (status);
158 }
159