2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 static char sccsid[] = "@(#)popen.c 8.1 (Berkeley) 6/6/93";
38 static const char rcsid[] =
56 static struct fp *fp_head;
65 static struct child *child;
66 static struct child *findchild __P((int));
67 static void delchild __P((struct child *));
68 static int file_pid __P((FILE *));
72 const char *path, *mode;
76 if ((fp = fopen(path, mode)) != NULL) {
77 register_file(fp, 0, 0);
78 (void)fcntl(fileno(fp), F_SETFD, 1);
90 if ((fp = fdopen(fd, mode)) != NULL) {
91 register_file(fp, 0, 0);
92 (void)fcntl(fileno(fp), F_SETFD, 1);
111 int myside, hisside, fd0, fd1;
117 (void)fcntl(p[READ], F_SETFD, 1);
118 (void)fcntl(p[WRITE], F_SETFD, 1);
122 hisside = fd1 = p[WRITE];
125 hisside = fd0 = p[READ];
128 if ((pid = start_command(cmd, 0, fd0, fd1, NULL, NULL, NULL)) < 0) {
129 (void)close(p[READ]);
130 (void)close(p[WRITE]);
133 (void)close(hisside);
134 if ((fp = fdopen(myside, mode)) != NULL)
135 register_file(fp, 1, pid);
147 unregister_file(ptr);
149 omask = sigblock(sigmask(SIGINT)|sigmask(SIGHUP));
151 (void)sigsetmask(omask);
159 while (fp_head != NULL)
161 (void)Pclose(fp_head->fp);
163 (void)Fclose(fp_head->fp);
167 register_file(fp, pipe, pid)
173 if ((fpp = malloc(sizeof(*fpp))) == NULL)
174 err(1, "Out of memory");
188 for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
194 errx(1, "Invalid file pointer");
204 for (p = fp_head; p != NULL; p = p->link)
207 errx(1, "Invalid file pointer");
212 * Run a command without a shell, with optional arguments and splicing
213 * of stdin and stdout. The command name can be a sequence of words.
214 * Signals must be handled by the caller.
215 * "Mask" contains the signals to ignore in the new process.
216 * SIGINT is enabled unless it's in the mask.
220 run_command(cmd, mask, infd, outfd, a0, a1, a2)
222 int mask, infd, outfd;
227 if ((pid = start_command(cmd, mask, infd, outfd, a0, a1, a2)) < 0)
229 return (wait_command(pid));
234 start_command(cmd, mask, infd, outfd, a0, a1, a2)
236 int mask, infd, outfd;
241 if ((pid = fork()) < 0) {
247 int i = getrawlist(cmd, argv, sizeof(argv) / sizeof(*argv));
249 if ((argv[i++] = a0) != NULL &&
250 (argv[i++] = a1) != NULL &&
251 (argv[i++] = a2) != NULL)
253 prepare_child(mask, infd, outfd);
254 execvp(argv[0], argv);
262 prepare_child(mask, infd, outfd)
263 int mask, infd, outfd;
268 * All file descriptors other than 0, 1, and 2 are supposed to be
275 for (i = 1; i <= NSIG; i++)
276 if (mask & sigmask(i))
277 (void)signal(i, SIG_IGN);
278 if ((mask & sigmask(SIGINT)) == 0)
279 (void)signal(SIGINT, SIG_DFL);
288 if (wait_child(pid) < 0) {
289 printf("Fatal error in process.\n");
295 static struct child *
301 for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
305 *cpp = malloc(sizeof(struct child));
307 err(1, "Out of memory");
309 (*cpp)->done = (*cpp)->free = 0;
321 for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
336 while ((pid = waitpid((pid_t)-1, &status, WNOHANG)) > 0) {
350 * Wait for a specific child to die.
356 int mask = sigblock(sigmask(SIGCHLD));
357 struct child *cp = findchild(pid);
361 wait_status = cp->status;
363 (void)sigsetmask(mask);
364 return ((WIFEXITED(wait_status) && WEXITSTATUS(wait_status)) ? -1 : 0);
368 * Mark a child as don't care.
374 int mask = sigblock(sigmask(SIGCHLD));
375 struct child *cp = findchild(pid);
381 (void)sigsetmask(mask);