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
33 * @(#)popen.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.bin/mail/popen.c,v 1.2.6.3 2003/01/06 05:46:03 mikeh Exp $
35 * $DragonFly: src/usr.bin/mail/popen.c,v 1.2 2003/06/17 04:29:28 dillon Exp $
52 static struct fp *fp_head;
61 static struct child *child;
62 static struct child *findchild(int);
63 static void delchild(struct child *);
64 static int file_pid(FILE *);
68 const char *path, *mode;
72 if ((fp = fopen(path, mode)) != NULL) {
73 register_file(fp, 0, 0);
74 (void)fcntl(fileno(fp), F_SETFD, 1);
86 if ((fp = fdopen(fd, mode)) != NULL) {
87 register_file(fp, 0, 0);
88 (void)fcntl(fileno(fp), F_SETFD, 1);
107 int myside, hisside, fd0, fd1;
114 (void)fcntl(p[READ], F_SETFD, 1);
115 (void)fcntl(p[WRITE], F_SETFD, 1);
119 hisside = fd1 = p[WRITE];
122 hisside = fd0 = p[READ];
125 (void)sigemptyset(&nset);
126 if ((pid = start_command(cmd, &nset, fd0, fd1, NULL, NULL, NULL)) < 0) {
127 (void)close(p[READ]);
128 (void)close(p[WRITE]);
131 (void)close(hisside);
132 if ((fp = fdopen(myside, mode)) != NULL)
133 register_file(fp, 1, pid);
145 unregister_file(ptr);
147 (void)sigemptyset(&nset);
148 (void)sigaddset(&nset, SIGINT);
149 (void)sigaddset(&nset, SIGHUP);
150 (void)sigprocmask(SIG_BLOCK, &nset, &oset);
152 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
160 while (fp_head != NULL)
162 (void)Pclose(fp_head->fp);
164 (void)Fclose(fp_head->fp);
168 register_file(fp, pipe, pid)
174 if ((fpp = malloc(sizeof(*fpp))) == NULL)
175 err(1, "Out of memory");
189 for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
195 errx(1, "Invalid file pointer");
205 for (p = fp_head; p != NULL; p = p->link)
208 errx(1, "Invalid file pointer");
213 * Run a command without a shell, with optional arguments and splicing
214 * of stdin and stdout. The command name can be a sequence of words.
215 * Signals must be handled by the caller.
216 * "Mask" contains the signals to ignore in the new process.
217 * SIGINT is enabled unless it's in the mask.
221 run_command(cmd, mask, infd, outfd, a0, a1, a2)
229 if ((pid = start_command(cmd, mask, infd, outfd, a0, a1, a2)) < 0)
231 return (wait_command(pid));
236 start_command(cmd, mask, infd, outfd, a0, a1, a2)
244 if ((pid = fork()) < 0) {
250 int i = getrawlist(cmd, argv, sizeof(argv) / sizeof(*argv));
252 if ((argv[i++] = a0) != NULL &&
253 (argv[i++] = a1) != NULL &&
254 (argv[i++] = a2) != NULL)
256 prepare_child(mask, infd, outfd);
257 execvp(argv[0], argv);
265 prepare_child(nset, infd, outfd)
273 * All file descriptors other than 0, 1, and 2 are supposed to be
280 for (i = 1; i < NSIG; i++)
281 if (nset != NULL && sigismember(nset, i))
282 (void)signal(i, SIG_IGN);
283 if (nset == NULL || !sigismember(nset, SIGINT))
284 (void)signal(SIGINT, SIG_DFL);
285 (void)sigemptyset(&eset);
286 (void)sigprocmask(SIG_SETMASK, &eset, NULL);
294 if (wait_child(pid) < 0) {
295 printf("Fatal error in process.\n");
301 static struct child *
307 for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
311 *cpp = malloc(sizeof(struct child));
313 err(1, "Out of memory");
315 (*cpp)->done = (*cpp)->free = 0;
327 for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
342 while ((pid = waitpid((pid_t)-1, &status, WNOHANG)) > 0) {
356 * Wait for a specific child to die.
363 struct child *cp = findchild(pid);
365 (void)sigemptyset(&nset);
366 (void)sigaddset(&nset, SIGCHLD);
367 (void)sigprocmask(SIG_BLOCK, &nset, &oset);
370 (void)sigsuspend(&oset);
371 wait_status = cp->status;
373 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
374 return ((WIFEXITED(wait_status) && WEXITSTATUS(wait_status)) ? -1 : 0);
378 * Mark a child as don't care.
385 struct child *cp = findchild(pid);
387 (void)sigemptyset(&nset);
388 (void)sigaddset(&nset, SIGCHLD);
389 (void)sigprocmask(SIG_BLOCK, &nset, &oset);
395 (void)sigprocmask(SIG_SETMASK, &oset, NULL);