1 /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
4 * We are making the OpenFlow specification and associated documentation
5 * (Software) available for public use and benefit with the expectation
6 * that others will use, modify and enhance the Software and contribute
7 * those enhancements back to the community. However, since we would
8 * like to make the Software available for broadest use, with as few
9 * restrictions as possible permission is hereby granted, free of
10 * charge, to any person obtaining a copy of this Software to deal in
11 * the Software under the copyrights without restriction, including
12 * without limitation the rights to use, copy, modify, merge, publish,
13 * distribute, sublicense, and/or sell copies of the Software, and to
14 * permit persons to whom the Software is furnished to do so, subject to
15 * the following conditions:
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
24 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
26 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 * The name and trademarks of copyright holder(s) may NOT be used in
30 * advertising or publicity pertaining to the Software or any
31 * derivatives without specific, written prior permission.
40 #include "fatal-signal.h"
43 #define THIS_MODULE VLM_daemon
46 /* Should we run in the background? */
49 /* Name of pidfile (null if none). */
52 /* Sets up a following call to daemonize() to create a pidfile named 'name'.
53 * If 'name' begins with '/', then it is treated as an absolute path.
54 * Otherwise, it is taken relative to RUNDIR, which is $(prefix)/var/run by
57 * If 'name' is null, then program_name followed by ".pid" is used. */
59 set_pidfile(const char *name)
62 pidfile = (!name ? xasprintf("%s/%s.pid", RUNDIR, program_name)
63 : *name == '/' ? xstrdup(name)
64 : xasprintf("%s/%s", RUNDIR, name));
67 /* Sets up a following call to daemonize() to detach from the foreground
68 * session, running this process in the background. */
75 /* If a pidfile has been configured, creates it and stores 'pid' in it. It is
76 * the caller's responsibility to make sure that the pidfile will eventually
79 make_pidfile(pid_t pid)
84 file = fopen(pidfile, "w");
86 fprintf(file, "%ld\n", (long int) pid);
89 VLOG_ERR("failed to create \"%s\": %s", pidfile, strerror(errno));
96 /* If configured with set_pidfile() or set_detach(), creates the pid file and
97 * detaches from the foreground session. */
104 /* Fork and exit from the parent. */
107 fatal(errno, "could not fork");
115 fatal_signal_add_file_to_unlink(pidfile);
121 fatal_signal_add_file_to_unlink(pidfile);
123 make_pidfile(getpid());