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authorRob Austein <sra@hactrn.net>2014-04-05 22:42:12 +0000
committerRob Austein <sra@hactrn.net>2014-04-05 22:42:12 +0000
commitfe0bf509f528dbdc50c7182f81057c6a4e15e4bd (patch)
tree07c9a923d4a0ccdfea11c49cd284f6d5757c5eda /rpkid/rpki/daemonize.py
parentaa28ef54c271fbe4d52860ff8cf13cab19e2207c (diff)
Source tree reorg, phase 1. Almost everything moved, no file contents changed.
svn path=/branches/tk685/; revision=5757
Diffstat (limited to 'rpkid/rpki/daemonize.py')
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diff --git a/rpkid/rpki/daemonize.py b/rpkid/rpki/daemonize.py
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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 sys
-import os
-import atexit
-import signal
-import rpki.log
-
-# 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:
- rpki.log.warn("Couldn't write PID file %s: %s" % (pidfile, e.strerror))