185baab4f6
Main process waits for signal (SIGUSR1) from the last forked child. Timeout is set to 3 seconds, after which the main process exits with non-zero (1) exit code. Without this fix, we can encounter race condition with systemd when starting the service. If the main process is terminated and deamonization is not finished, systemd kills the whole process group.
139 lines
3.3 KiB
Python
Executable file
139 lines
3.3 KiB
Python
Executable file
#!/usr/bin/python
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#
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# tuned: A simple daemon that performs monitoring and adaptive configuration
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# of devices in the system
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#
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# Copyright (C) 2008, 2009 Red Hat, Inc.
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# Authors: Phil Knirsch
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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import sys, os.path, getopt, atexit, signal
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INIT_TIMEOUT = 3
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TUNEDDIR = "/usr/share/tuned"
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if not TUNEDDIR in sys.path:
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sys.path.append(TUNEDDIR)
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import logging, tuned_logging
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log = logging.getLogger("tuned")
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def usage():
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print "Usage: tuned [-d|--daemon] [-c conffile|--config=conffile] [-D|--debug]"
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def handler(signum, frame):
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log.debug("Received signal number %d." % signum)
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sys.exit()
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def daemonize():
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log.debug("Daemonizing")
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try:
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pid = os.fork()
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if pid > 0:
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daemonize_wait()
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sys.exit(0)
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except OSError, e:
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log.critical("Cannot fork: %s", str(e))
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sys.exit(1)
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os.chdir("/")
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os.setsid()
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os.umask(0)
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try:
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pid = os.fork()
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if pid > 0:
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sys.exit(0)
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except OSError, e:
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log.cricital("Cannot fork: %s", str(e))
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sys.exit(1)
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si = file('/dev/null', 'r')
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so = file('/dev/null', 'a+')
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se = file('/dev/null', 'a+', 0)
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os.dup2(si.fileno(), sys.stdin.fileno())
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os.dup2(so.fileno(), sys.stdout.fileno())
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os.dup2(se.fileno(), sys.stderr.fileno())
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def daemonize_wait():
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signal.signal(signal.SIGALRM, daemonize_handle_signal)
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signal.signal(signal.SIGUSR1, daemonize_handle_signal)
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signal.alarm(INIT_TIMEOUT)
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while True:
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signal.pause()
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def daemonize_done(ppid):
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os.kill(ppid, signal.SIGUSR1)
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def daemonize_handle_signal(signum, frame):
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if signum == signal.SIGALRM:
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sys.exit(1)
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elif signum == signal.SIGUSR1:
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sys.exit(0)
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else:
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pass
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if __name__ == "__main__":
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try:
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opts, args = getopt.getopt(sys.argv[1:], "dc:D", ["daemon", "config=", "debug"])
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except getopt.error, e:
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print >>sys.stderr, ("Error parsing command-line arguments: %s" % e)
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usage()
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sys.exit(1)
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if len(args) > 0:
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print >>sys.stderr, ("Too many arguments.")
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usage()
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sys.exit(1)
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daemon = False
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cfgfile = "/etc/tuned.conf"
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debug = False
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is_superuser = os.getuid() == 0
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for (opt, val) in opts:
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if opt in ['-d', "--daemon"]:
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daemon = True
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elif opt in ['-c', "--config"]:
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cfgfile = val
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elif opt in ['-D', "--debug"]:
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debug = True
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if not is_superuser:
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if daemon:
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log.critical("Superuser permissions are needed.")
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sys.exit(1)
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else:
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log.warn("Superuser permissions are needed. Most tunings will not work!")
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if daemon:
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main_pid = os.getpid()
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log.switchToFile()
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daemonize()
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from tuned import tuned
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tuned.init(TUNEDDIR, cfgfile, debug = debug)
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if daemon:
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daemonize_done(main_pid)
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atexit.register(logging.shutdown)
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atexit.register(tuned.cleanup)
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signal.signal(signal.SIGTERM, handler)
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tuned.run()
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tuned.cleanup()
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