I try to daemonize twisted, but it uses 100% cpu.
The problem occurs in this code:
def daemonize(log_stdout=False, out_name=None, log_stderr=False,
err_name=None):
"""
Turn current process into a daemon
"""
pid = os.fork()
if (pid == 0):
## os.chdir (workdir)
os.setsid()
maxfd = os.sysconf("SC_OPEN_MAX")
for fd in range(0, maxfd):
try:
os.close(fd)
except OSError: # ERROR (ignore)
pass
# Redirect the standard file descriptors to /dev/null. <<<< HERE's
THE PROBLEM
os.open("/dev/null", os.O_RDONLY) # standard input (0)
os.open("/dev/null", os.O_RDWR) # standard output (1)
os.open("/dev/null", os.O_RDWR) # standard error (2)
if (not out_name):
out_name = gen_name() + '.out'
if (not err_name):
err_name = gen_name() + '.err'
if (log_stdout):
sys.stdout = logger.logger (out_name)
if (log_stderr):
sys.stderr = logger.logger (err_name)
else:
print "forked pid", pid
sys.exit (0)
If I comment out the lines that open /dev/null, everything is OK, but with
those lines the process uses 100% cpu.
The actual twisted code (not shown) is
class Spawner(xmlrpc.XMLRPC):
...
r = Spawner()
reactor.listenTCP(7080, server.Site(r))
reactor.run()
This is on linux.
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