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Contents
module Kernel
# This method causes the current running process to become a daemon
# All further printing is relied to the error.log
# FIXME doesn't belong into Butler::Bot, rather into botcontrol
def daemonize(chdir=nil, &on_sighup)
srand # Split rand streams between spawning and daemonized process
safe_fork and exit # Fork and exit from the parent
# Detach from the controlling terminal
raise "Can't detach from controlling terminal" unless sess_id = Process.setsid
# Prevent the possibility of acquiring a controlling terminal
trap('SIGHUP', 'IGNORE')
exit if safe_fork
# In daemon mode, a SIGHUP means termination
trap('SIGHUP', &on_sighup)
# We can't get the originally controlling terminals stdout/stdin anymore
STDIN.reopen("/dev/null")
STDOUT.reopen("/dev/null", "a")
STDERR.reopen(STDOUT)
Dir.chdir(chdir) if chdir
File.umask 0033 # FIXME ask somebody knowledgable about a sensible value
sess_id
end
# Try to fork if at all possible retrying every +delay+ sec (5s default)
# if the maximum process limit for the system has been reached
def safe_fork(delay=5)
fork
rescue Errno::EWOULDBLOCK
sleep(delay)
retry
end
end
Version data entries
27 entries across 27 versions & 1 rubygems