2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 2014 The FreeBSD Foundation
9 * This code is derived from software written by Ken Arnold and
10 * published in UNIX Review, Vol. 6, No. 8.
12 * Portions of this software were developed by Edward Tomasz Napierala
13 * under sponsorship from the FreeBSD Foundation.
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
44 #include <sys/param.h>
45 #include <sys/queue.h>
59 extern char **environ;
62 SLIST_ENTRY(pid) next;
67 static SLIST_HEAD(, pid) pidlist = SLIST_HEAD_INITIALIZER(pidlist);
72 * Replacement for popen(3), without stdin (which we do not use), but with
73 * stderr, proper logging, and improved command line arguments passing.
74 * Error handling is built in - if it returns, then it succeeded.
77 auto_popen(const char *argv0, ...)
82 int error, i, nullfd, outfds[2];
83 char *arg, *argv[ARGV_LEN], *command;
85 nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
87 log_err(1, "cannot open %s", _PATH_DEVNULL);
93 cur = malloc(sizeof(struct pid));
97 argv[0] = checked_strdup(argv0);
103 log_errx(1, "too many arguments to auto_popen");
104 arg = va_arg(ap, char *);
109 command = concat(command, ' ', arg);
113 cur->command = checked_strdup(command);
115 switch (pid = fork()) {
116 case -1: /* Error. */
120 dup2(nullfd, STDIN_FILENO);
121 dup2(outfds[1], STDOUT_FILENO);
127 SLIST_FOREACH(p, &pidlist, next)
128 close(fileno(p->outfp));
129 execvp(argv[0], argv);
130 log_err(1, "failed to execute %s", argv[0]);
134 log_debugx("executing \"%s\" as pid %d", command, pid);
136 /* Parent; assume fdopen cannot fail. */
137 cur->outfp = fdopen(outfds[0], "r");
141 /* Link into list of file descriptors. */
143 SLIST_INSERT_HEAD(&pidlist, cur, next);
149 auto_pclose(FILE *iop)
151 struct pid *cur, *last = NULL;
156 * Find the appropriate file pointer and remove it from the list.
158 SLIST_FOREACH(cur, &pidlist, next) {
159 if (cur->outfp == iop)
167 SLIST_REMOVE_HEAD(&pidlist, next);
169 SLIST_REMOVE_AFTER(last, next);
174 pid = wait4(cur->pid, &status, 0, NULL);
175 } while (pid == -1 && errno == EINTR);
177 if (WIFSIGNALED(status)) {
178 log_warnx("\"%s\", pid %d, terminated with signal %d",
179 cur->command, pid, WTERMSIG(status));
183 if (WEXITSTATUS(status) != 0) {
184 log_warnx("\"%s\", pid %d, terminated with exit status %d",
185 cur->command, pid, WEXITSTATUS(status));
189 log_debugx("\"%s\", pid %d, terminated gracefully", cur->command, pid);
194 return (pid == -1 ? -1 : status);