def main(argv=None):
global XEND_DAEMONIZE
XEND_DAEMONIZE = False
if argv is None:
argv = sys.argv
try:
daemon = instance()
r, w = os.pipe()
daemon.run(os.fdopen(w, 'w'))
return 0
except Exception, exn:
log.fatal(exn)
return 1
def main(argv = None):
global XEND_DAEMONIZE
XEND_DAEMONIZE = False
if argv is None:
argv = sys.argv
try:
daemon = instance()
r,w = os.pipe()
daemon.run(os.fdopen(w, 'w'))
return 0
except Exception, exn:
log.fatal(exn)
return 1
def refresh(self, initialising = False):
"""Refresh domain list from Xen. Expects to be protected by the
domains_lock.
@param initialising True if this is the first refresh after starting
Xend. This does not change this method's behaviour, except for
logging.
"""
doms = self.xen_domains()
for d in self.domains.values():
info = doms.get(d.getDomid())
if info:
d.update(info)
else:
self._delete_domain(d.getDomid())
for d in doms:
if d not in self.domains:
if doms[d]['dying']:
log.log(initialising and logging.ERROR or logging.DEBUG,
'Cannot recreate information for dying domain %d.'
' Xend will ignore this domain from now on.',
doms[d]['dom'])
elif d == PRIV_DOMAIN:
log.fatal(
"No record of privileged domain %d! Terminating.", d)
sys.exit(1)
else:
try:
self._add_domain(
XendDomainInfo.recreate(doms[d], False))
except:
log.exception(
"Failed to recreate information for domain "
"%d. Destroying it in the hope of "
"recovery.", d)
try:
xc.domain_destroy(d)
except:
log.exception('Destruction of %d failed.', d)
def start(self, trace=0):
"""Attempts to start the daemons.
The return value is defined by the LSB:
0 Success
4 Insufficient privileges
"""
xend_pid = self.cleanup_xend(False)
if self.set_user():
return 4
os.chdir("/")
if xend_pid > 0:
# Trying to run an already-running service is a success.
return 0
ret = 0
# If we're not going to create a daemon, simply
# call the run method right here.
if not XEND_DAEMONIZE:
self.tracing(trace)
self.run(None)
return ret
# we use a pipe to communicate between the parent and the child process
# this way we know when the child has actually initialized itself so
# we can avoid a race condition during startup
r, w = os.pipe()
if os.fork():
os.close(w)
r = os.fdopen(r, 'r')
try:
s = r.read()
finally:
r.close()
if not len(s):
ret = 1
else:
ret = int(s)
else:
os.close(r)
# Child
self.daemonize()
self.tracing(trace)
# If Xend proper segfaults, then we want to restart it. Thus,
# we fork a child for running Xend itself, and if it segfaults
# (or exits any way other than cleanly) then we run it again.
# The first time through we want the server to write to the (r,w)
# pipe created above, so that we do not exit until the server is
# ready to receive requests. All subsequent restarts we don't
# want this behaviour, or the pipe will eventually fill up, so
# we just pass None into run in subsequent cases (by clearing w
# in the parent of the first fork). On some operating systems,
# restart is managed externally, so we won't fork, and just exit.
while True:
if not osdep.xend_autorestart:
self.run(os.fdopen(w, 'w'))
os._exit(0)
pid = self.fork_pid()
if pid:
if w is not None:
os.close(w)
w = None
(_, status) = os.waitpid(pid, 0)
if os.WIFEXITED(status):
code = os.WEXITSTATUS(status)
log.info('Xend exited with status %d.', code)
sys.exit(code)
if os.WIFSIGNALED(status):
sig = os.WTERMSIG(status)
if sig in (signal.SIGINT, signal.SIGTERM):
log.info('Xend stopped due to signal %d.', sig)
sys.exit(0)
else:
log.fatal(
'Xend died due to signal %d! Restarting it.',
sig)
else:
self.run(w and os.fdopen(w, 'w') or None)
# if we reach here, the child should quit.
os._exit(0)
return ret
def start(self, trace=0):
"""Attempts to start the daemons.
The return value is defined by the LSB:
0 Success
4 Insufficient privileges
"""
xend_pid = self.cleanup_xend(False)
if self.set_user():
return 4
os.chdir("/")
if xend_pid > 0:
# Trying to run an already-running service is a success.
return 0
ret = 0
# If we're not going to create a daemon, simply
# call the run method right here.
if not XEND_DAEMONIZE:
self.tracing(trace)
self.run(None)
return ret
# we use a pipe to communicate between the parent and the child process
# this way we know when the child has actually initialized itself so
# we can avoid a race condition during startup
r,w = os.pipe()
if os.fork():
os.close(w)
r = os.fdopen(r, 'r')
try:
s = r.read()
finally:
r.close()
if not len(s):
ret = 1
else:
ret = int(s)
else:
os.close(r)
# Child
self.daemonize()
self.tracing(trace)
# If Xend proper segfaults, then we want to restart it. Thus,
# we fork a child for running Xend itself, and if it segfaults
# (or exits any way other than cleanly) then we run it again.
# The first time through we want the server to write to the (r,w)
# pipe created above, so that we do not exit until the server is
# ready to receive requests. All subsequent restarts we don't
# want this behaviour, or the pipe will eventually fill up, so
# we just pass None into run in subsequent cases (by clearing w
# in the parent of the first fork). On some operating systems,
# restart is managed externally, so we won't fork, and just exit.
while True:
if not osdep.xend_autorestart:
self.run(os.fdopen(w, 'w'))
os._exit(0)
pid = self.fork_pid()
if pid:
if w is not None:
os.close(w)
w = None
(_, status) = os.waitpid(pid, 0)
if os.WIFEXITED(status):
code = os.WEXITSTATUS(status)
log.info('Xend exited with status %d.', code)
sys.exit(code)
if os.WIFSIGNALED(status):
sig = os.WTERMSIG(status)
if sig in (signal.SIGINT, signal.SIGTERM):
log.info('Xend stopped due to signal %d.', sig)
sys.exit(0)
else:
log.fatal(
'Xend died due to signal %d! Restarting it.',
sig)
else:
self.run(w and os.fdopen(w, 'w') or None)
# if we reach here, the child should quit.
os._exit(0)
return ret
