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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)popen.c 8.1 (Berkeley) 6/6/93
30 * $FreeBSD: src/usr.bin/mail/popen.c,v 1.2.6.3 2003/01/06 05:46:03 mikeh Exp $
31 * $DragonFly: src/usr.bin/mail/popen.c,v 1.4 2004/09/08 03:01:11 joerg Exp $
48 static struct fp *fp_head;
57 static struct child *child;
58 static struct child *findchild(int);
59 static void delchild(struct child *);
60 static int file_pid(FILE *);
63 Fopen(const char *path, const char *mode)
67 if ((fp = fopen(path, mode)) != NULL) {
68 register_file(fp, 0, 0);
69 fcntl(fileno(fp), F_SETFD, 1);
75 Fdopen(int fd, const char *mode)
79 if ((fp = fdopen(fd, mode)) != NULL) {
80 register_file(fp, 0, 0);
81 fcntl(fileno(fp), F_SETFD, 1);
94 Popen(char *cmd, const char *mode)
97 int myside, hisside, fd0, fd1;
104 fcntl(p[READ], F_SETFD, 1);
105 fcntl(p[WRITE], F_SETFD, 1);
109 hisside = fd1 = p[WRITE];
112 hisside = fd0 = p[READ];
116 if ((pid = start_command(cmd, &nset, fd0, fd1, NULL, NULL, NULL)) < 0) {
122 if ((fp = fdopen(myside, mode)) != NULL)
123 register_file(fp, 1, pid);
134 unregister_file(ptr);
137 sigaddset(&nset, SIGINT);
138 sigaddset(&nset, SIGHUP);
139 sigprocmask(SIG_BLOCK, &nset, &oset);
141 sigprocmask(SIG_SETMASK, &oset, NULL);
146 close_all_files(void)
149 while (fp_head != NULL)
151 (void)Pclose(fp_head->fp);
153 (void)Fclose(fp_head->fp);
157 register_file(FILE *fp, int pipe, int pid)
161 if ((fpp = malloc(sizeof(*fpp))) == NULL)
162 err(1, "Out of memory");
171 unregister_file(FILE *fp)
175 for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
181 errx(1, "Invalid file pointer");
190 for (p = fp_head; p != NULL; p = p->link)
193 errx(1, "Invalid file pointer");
198 * Run a command without a shell, with optional arguments and splicing
199 * of stdin and stdout. The command name can be a sequence of words.
200 * Signals must be handled by the caller.
201 * "Mask" contains the signals to ignore in the new process.
202 * SIGINT is enabled unless it's in the mask.
206 run_command(char *cmd, sigset_t *mask, int infd, int outfd, char *a0, char *a1,
211 if ((pid = start_command(cmd, mask, infd, outfd, a0, a1, a2)) < 0)
213 return (wait_command(pid));
218 start_command(char *cmd, sigset_t *mask, int infd, int outfd, char *a0,
223 if ((pid = fork()) < 0) {
229 int i = getrawlist(cmd, argv, sizeof(argv) / sizeof(*argv));
231 if ((argv[i++] = a0) != NULL &&
232 (argv[i++] = a1) != NULL &&
233 (argv[i++] = a2) != NULL)
235 prepare_child(mask, infd, outfd);
236 execvp(argv[0], argv);
244 prepare_child(sigset_t *nset, int infd, int outfd)
250 * All file descriptors other than 0, 1, and 2 are supposed to be
257 for (i = 1; i < NSIG; i++)
258 if (nset != NULL && sigismember(nset, i))
259 (void)signal(i, SIG_IGN);
260 if (nset == NULL || !sigismember(nset, SIGINT))
261 (void)signal(SIGINT, SIG_DFL);
263 sigprocmask(SIG_SETMASK, &eset, NULL);
267 wait_command(int pid)
269 if (wait_child(pid) < 0) {
270 printf("Fatal error in process.\n");
276 static struct child *
281 for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
285 *cpp = malloc(sizeof(struct child));
287 err(1, "Out of memory");
289 (*cpp)->done = (*cpp)->free = 0;
296 delchild(struct child *cp)
300 for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
314 while ((pid = waitpid((pid_t)-1, &status, WNOHANG)) > 0) {
328 * Wait for a specific child to die.
334 struct child *cp = findchild(pid);
337 sigaddset(&nset, SIGCHLD);
338 sigprocmask(SIG_BLOCK, &nset, &oset);
341 (void)sigsuspend(&oset);
342 wait_status = cp->status;
344 sigprocmask(SIG_SETMASK, &oset, NULL);
345 return ((WIFEXITED(wait_status) && WEXITSTATUS(wait_status)) ? -1 : 0);
349 * Mark a child as don't care.
355 struct child *cp = findchild(pid);
358 sigaddset(&nset, SIGCHLD);
359 sigprocmask(SIG_BLOCK, &nset, &oset);
365 sigprocmask(SIG_SETMASK, &oset, NULL);