2 * Copyright (c) 1999 Berkeley Software Design, Inc. All rights reserved.
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5 * modification, are permitted provided that the following conditions
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13 * promote products derived from this software without specific prior
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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28 * From BSDI: daemon.c,v 1.2 1996/08/15 01:11:09 jch Exp
34 #include <sys/param.h>
43 static void restrict_process(const char *);
44 static void usage(void);
47 main(int argc, char *argv[])
49 struct pidfh *pfh = NULL;
50 int ch, nochdir, noclose, errcode;
51 const char *pidfile, *user;
54 nochdir = noclose = 1;
55 pidfile = user = NULL;
56 while ((ch = getopt(argc, argv, "-cfp:u:")) != -1) {
81 restrict_process(user);
84 * Try to open the pidfile before calling daemon(3),
85 * to be able to report the error intelligently
88 pfh = pidfile_open(pidfile, 0600, &otherpid);
90 if (errno == EEXIST) {
91 errx(3, "process already running, pid: %d",
94 err(2, "pidfile ``%s''", pidfile);
98 if (daemon(nochdir, noclose) == -1)
101 /* Now that we are the child, write out the pid */
105 execvp(argv[0], argv);
108 * execvp() failed -- unlink pidfile if any, and
111 errcode = errno; /* Preserve errcode -- unlink may reset it */
115 /* The child is now running, so the exit status doesn't matter. */
116 errc(1, errcode, "%s", argv[0]);
120 restrict_process(const char *user)
122 struct passwd *pw = NULL;
126 errx(1, "unknown user: %s", user);
128 if (setuid(pw->pw_uid) != 0)
129 errx(1, "failed to setuid to %s", user);
135 (void)fprintf(stderr,
136 "usage: daemon [-cf] [-p pidfile] [-u user] command "