2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 #if defined(LIBC_SCCS) && !defined(lint)
40 static char sccsid[] = "@(#)popen.c 8.1 (Berkeley) 6/4/93";
41 #endif /* LIBC_SCCS and not lint */
43 #include <sys/param.h>
61 raw_popen(const char *program, char * const *argv, const char *type)
67 if ((*type != 'r' && *type != 'w') || type[1])
70 if ((cur = malloc(sizeof(struct pid))) == NULL)
78 switch (pid = vfork()) {
87 if (pdes[1] != STDOUT_FILENO) {
88 (void)dup2(pdes[1], STDOUT_FILENO);
91 (void) close(pdes[0]);
93 if (pdes[0] != STDIN_FILENO) {
94 (void)dup2(pdes[0], STDIN_FILENO);
100 execl(_PATH_BSHELL, "sh", "-c", program, (char *)NULL);
102 execvp(program, argv);
107 /* Parent; assume fdopen can't fail. */
109 iop = fdopen(pdes[0], type);
110 (void)close(pdes[1]);
112 iop = fdopen(pdes[1], type);
113 (void)close(pdes[0]);
116 /* Link into list of file descriptors. */
127 * Pclose returns -1 if stream is not associated with a `popened' command,
128 * if already `pclosed', or waitpid returns an error.
131 raw_pclose(FILE *iop)
133 register struct pid *cur, *last;
139 /* Find the appropriate file pointer. */
140 for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next)
146 /* Get the status of the process. */
147 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
149 pid = waitpid(cur->pid, (int *) &pstat, 0);
150 } while (pid == -1 && errno == EINTR);
151 (void)sigsetmask(omask);
153 /* Remove the entry from the linked list. */
157 last->next = cur->next;
160 return (pid == -1 ? -1 : pstat);