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";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
56 static struct fp *fp_head;
65 static struct child *child;
66 static struct child *findchild(int);
67 static void delchild(struct child *);
68 static int file_pid(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;
118 (void)fcntl(p[READ], F_SETFD, 1);
119 (void)fcntl(p[WRITE], F_SETFD, 1);
123 hisside = fd1 = p[WRITE];
126 hisside = fd0 = p[READ];
129 (void)sigemptyset(&nset);
130 if ((pid = start_command(cmd, &nset, fd0, fd1, NULL, NULL, NULL)) < 0) {
131 (void)close(p[READ]);
132 (void)close(p[WRITE]);
135 (void)close(hisside);
136 if ((fp = fdopen(myside, mode)) != NULL)
137 register_file(fp, 1, pid);
149 unregister_file(ptr);
151 (void)sigemptyset(&nset);
152 (void)sigaddset(&nset, SIGINT);
153 (void)sigaddset(&nset, SIGHUP);
154 (void)sigprocmask(SIG_BLOCK, &nset, &oset);
156 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
164 while (fp_head != NULL)
166 (void)Pclose(fp_head->fp);
168 (void)Fclose(fp_head->fp);
172 register_file(fp, pipe, pid)
178 if ((fpp = malloc(sizeof(*fpp))) == NULL)
179 err(1, "Out of memory");
193 for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
199 errx(1, "Invalid file pointer");
209 for (p = fp_head; p != NULL; p = p->link)
212 errx(1, "Invalid file pointer");
217 * Run a command without a shell, with optional arguments and splicing
218 * of stdin and stdout. The command name can be a sequence of words.
219 * Signals must be handled by the caller.
220 * "Mask" contains the signals to ignore in the new process.
221 * SIGINT is enabled unless it's in the mask.
225 run_command(cmd, mask, infd, outfd, a0, a1, a2)
233 if ((pid = start_command(cmd, mask, infd, outfd, a0, a1, a2)) < 0)
235 return (wait_command(pid));
240 start_command(cmd, mask, infd, outfd, a0, a1, a2)
248 if ((pid = fork()) < 0) {
254 int i = getrawlist(cmd, argv, sizeof(argv) / sizeof(*argv));
256 if ((argv[i++] = a0) != NULL &&
257 (argv[i++] = a1) != NULL &&
258 (argv[i++] = a2) != NULL)
260 prepare_child(mask, infd, outfd);
261 execvp(argv[0], argv);
269 prepare_child(nset, infd, outfd)
277 * All file descriptors other than 0, 1, and 2 are supposed to be
284 for (i = 1; i < NSIG; i++)
285 if (nset != NULL && sigismember(nset, i))
286 (void)signal(i, SIG_IGN);
287 if (nset == NULL || !sigismember(nset, SIGINT))
288 (void)signal(SIGINT, SIG_DFL);
289 (void)sigemptyset(&eset);
290 (void)sigprocmask(SIG_SETMASK, &eset, NULL);
298 if (wait_child(pid) < 0) {
299 printf("Fatal error in process.\n");
305 static struct child *
311 for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
315 *cpp = malloc(sizeof(struct child));
317 err(1, "Out of memory");
319 (*cpp)->done = (*cpp)->free = 0;
331 for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
346 while ((pid = waitpid((pid_t)-1, &status, WNOHANG)) > 0) {
360 * Wait for a specific child to die.
369 (void)sigemptyset(&nset);
370 (void)sigaddset(&nset, SIGCHLD);
371 (void)sigprocmask(SIG_BLOCK, &nset, &oset);
376 (void)sigsuspend(&oset);
377 wait_status = cp->status;
379 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
380 return ((WIFEXITED(wait_status) && WEXITSTATUS(wait_status)) ? -1 : 0);
384 * Mark a child as don't care.
391 struct child *cp = findchild(pid);
393 (void)sigemptyset(&nset);
394 (void)sigaddset(&nset, SIGCHLD);
395 (void)sigprocmask(SIG_BLOCK, &nset, &oset);
401 (void)sigprocmask(SIG_SETMASK, &oset, NULL);