2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 2016 The DragonFly Project
5 * Copyright (c) 2014 The FreeBSD Foundation
8 * This code is derived from software written by Ken Arnold and
9 * published in UNIX Review, Vol. 6, No. 8.
11 * Portions of this software were developed by Edward Tomasz Napierala
12 * under sponsorship from the FreeBSD Foundation.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 #include <sys/types.h>
41 #include <sys/queue.h>
54 extern char **environ;
57 SLIST_ENTRY(pid) next;
62 static SLIST_HEAD(, pid) pidlist = SLIST_HEAD_INITIALIZER(pidlist);
67 * Replacement for popen(3), without stdin (which we do not use), but with
68 * stderr, proper logging, and improved command line arguments passing.
69 * Error handling is built in - if it returns, then it succeeded.
72 auto_popen(const char *argv0, ...)
77 int error, i, nullfd, outfds[2];
78 char *arg, *argv[ARGV_LEN], *command;
80 nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
82 log_err(1, "cannot open %s", _PATH_DEVNULL);
88 cur = malloc(sizeof(struct pid));
92 argv[0] = checked_strdup(argv0);
98 log_errx(1, "too many arguments to auto_popen");
99 arg = va_arg(ap, char *);
104 command = concat(command, ' ', arg);
108 cur->command = checked_strdup(command);
110 switch (pid = fork()) {
111 case -1: /* Error. */
115 dup2(nullfd, STDIN_FILENO);
116 dup2(outfds[1], STDOUT_FILENO);
122 SLIST_FOREACH(p, &pidlist, next)
123 close(fileno(p->outfp));
124 execvp(argv[0], argv);
125 log_err(1, "failed to execute %s", argv[0]);
129 log_debugx("executing \"%s\" as pid %d", command, pid);
131 /* Parent; assume fdopen cannot fail. */
132 cur->outfp = fdopen(outfds[0], "r");
136 /* Link into list of file descriptors. */
138 SLIST_INSERT_HEAD(&pidlist, cur, next);
144 auto_pclose(FILE *iop)
146 struct pid *cur, *last = NULL;
151 * Find the appropriate file pointer and remove it from the list.
153 SLIST_FOREACH(cur, &pidlist, next) {
154 if (cur->outfp == iop)
162 SLIST_REMOVE_HEAD(&pidlist, next);
164 SLIST_REMOVE_AFTER(last, next);
169 pid = wait4(cur->pid, &status, 0, NULL);
170 } while (pid == -1 && errno == EINTR);
172 if (WIFSIGNALED(status)) {
173 log_warnx("\"%s\", pid %d, terminated with signal %d",
174 cur->command, pid, WTERMSIG(status));
178 if (WEXITSTATUS(status) != 0) {
179 log_warnx("\"%s\", pid %d, terminated with exit status %d",
180 cur->command, pid, WEXITSTATUS(status));
184 log_debugx("\"%s\", pid %d, terminated gracefully", cur->command, pid);
189 return (pid == -1 ? -1 : status);