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# $Id$
#
# Copyright (C) 2012 Internet Systems Consortium ("ISC")
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
#
# Some code borrowed from
# http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/
#
# (which was explicitly placed in public domain by its author), and from
#
# /usr/src/lib/libc/gen/daemon.c
#
# (the libc implementation of daemon(3) on FreeBSD), so:
#
# Portions copyright (c) 1990, 1993
# The Regents of the University of California. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 4. Neither the name of the University nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
"""
Make a normal program into a "daemon", like the 4.4BSD daemon(3) call.
This doesn't quite follow either the 4.4BSD call or the Python 3.x library,
because it was written to fit into an existing package and I didn't
want to drag in yet another external library just for this.
"""
import os
import sys
import atexit
import signal
import logging
logger = logging.getLogger(__name__)
# Does default_pid_directory need to be autoconf-configurable?
## @var default_pid_directory
# Default directory to which to write process ID files.
default_pid_directory = "/var/run/rpki"
## @var pid_filename
# Configurable filename to which to write process ID file.
# pidfile argument to daemon() overrides this.
pid_filename = None
def daemon(nochdir = False, noclose = False, pidfile = None):
"""
Make this program become a daemon, like 4.4BSD daemon(3), and
write its pid out to a file with cleanup on exit.
"""
if pidfile is None:
if pid_filename is None:
prog = os.path.splitext(os.path.basename(sys.argv[0]))[0]
pidfile = os.path.join(default_pid_directory, "%s.pid" % prog)
else:
pidfile = pid_filename
old_sighup_action = signal.signal(signal.SIGHUP, signal.SIG_IGN)
try:
pid = os.fork()
except OSError, e:
sys.exit("fork() failed: %d (%s)" % (e.errno, e.strerror))
else:
if pid > 0:
os._exit(0)
if not nochdir:
os.chdir("/")
os.setsid()
if not noclose:
sys.stdout.flush()
sys.stderr.flush()
fd = os.open(os.devnull, os.O_RDWR)
os.dup2(fd, 0)
os.dup2(fd, 1)
os.dup2(fd, 2)
if fd > 2:
os.close(fd)
signal.signal(signal.SIGHUP, old_sighup_action)
def delete_pid_file():
try:
os.unlink(pidfile)
except OSError:
pass
atexit.register(delete_pid_file)
try:
f = open(pidfile, "w")
f.write("%d\n" % os.getpid())
f.close()
except IOError, e:
logger.warning("Couldn't write PID file %s: %s", pidfile, e.strerror)
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