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#!/usr/bin/env python
import signal, os, time, errno, pty, sys
GLOBAL_SIGCHLD_RECEIVED = 0
def signal_handler (signum, frame):
print '<HANDLER>'
global GLOBAL_SIGCHLD_RECEIVED
status = os.waitpid (-1, os.WNOHANG)
print 'WIFEXITED(status):', os.WIFEXITED(status)
print 'WEXITSTATUS(status):', os.WEXITSTATUS(status)
GLOBAL_SIGCHLD_RECEIVED = 1
def main ():
# sig_test ('SIG_IGN', 'ptyfork', 'yes')
sig_test ('handler', 'ptyfork', 'yes')
# sig_test ('SIG_IGN', 'ptyfork', 'no')
# sig_test ('handler', 'ptyfork', 'no')
# sig_test ('SIG_IGN', 'osfork', 'yes')
# sig_test ('handler', 'osfork', 'yes')
# sig_test ('SIG_IGN', 'osfork', 'no')
# sig_test ('handler', 'osfork', 'no')
def sig_test (sig_handler_type, fork_type, child_output):
print 'Testing with:'
print '\tsig_handler_type:', sig_handler_type
print '\tfork_type:', fork_type
print '\tchild_output:', child_output
if sig_handler_type == 'SIG_IGN':
signal.signal (signal.SIGCHLD, signal.SIG_IGN)
else:
signal.signal (signal.SIGCHLD, signal_handler)
pid = -1
fd = -1
if fork_type == 'ptyfork':
pid, fd = pty.fork()
else:
pid = os.fork()
if pid == 0:
if child_output == 'yes':
os.write (sys.stdout.fileno(), 'This is a test.\nThis is a test.')
time.sleep(10000)
#print 'Sending SIGKILL to child pid:', pid
time.sleep(2)
os.kill (pid, signal.SIGKILL)
#print 'Entering to sleep...'
try:
time.sleep(2)
except:
pass
try:
os.kill(pid, 0)
print '\tChild is alive. This is ambiguous because it may be a Zombie.'
except OSError, e:
print '\tChild appears to be dead.'
# print str(e)
print
if __name__ == '__main__':
main ()
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