2 * Copyright (c) 1999 Berkeley Software Design, Inc. All rights reserved.
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5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 * promote products derived from this software without specific prior
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 * From BSDI: daemon.c,v 1.2 1996/08/15 01:11:09 jch Exp
33 #include "getprogname.h"
35 #include <sys/param.h>
44 static void restrict_process(const char *);
45 static void usage(void);
48 main(int argc, char *argv[])
50 struct pidfh *pfh = NULL;
51 int ch, nochdir, noclose, errcode;
52 const char *pidfile, *user;
57 nochdir = noclose = 1;
58 pidfile = user = NULL;
59 while ((ch = getopt(argc, argv, "cfp:u:")) != -1) {
84 restrict_process(user);
87 * Try to open the pidfile before calling daemon(3),
88 * to be able to report the error intelligently
91 pfh = pidfile_open(pidfile, 0600, &otherpid);
93 if (errno == EEXIST) {
94 fprintf(stderr, "process already running, pid: %d\n", otherpid);
98 fprintf(stderr, "pidfile ``%s'': %s\n", pidfile, strerror(errno));
104 if (daemon(nochdir, noclose) == -1) {
105 fprintf(stderr, "%s\n", strerror(errno));
109 /* Now that we are the child, write out the pid */
113 execvp(argv[0], argv);
116 * execvp() failed -- unlink pidfile if any, and
119 errcode = errno; /* Preserve errcode -- unlink may reset it */
123 /* The child is now running, so the exit status doesn't matter. */
124 fprintf(stderr, "%s: %s\n", argv[0], strerror(errcode));
129 restrict_process(const char *user)
131 struct passwd *pw = NULL;
135 fprintf(stderr, "unknown user: %s\n", user);
139 if (setuid(pw->pw_uid) != 0) {
140 fprintf(stderr, "failed to setuid to %s\n", user);
149 "usage: daemon [-cf] [-p pidfile] [-u user] command "