1 import time, os, signal

     2 LOG_FILE = 'test.log'

     3 

     4 log_file = open(LOG_FILE, 'a')

     5 

     6 def log(msg):

     7     log_file.write(msg + '\n')

     8     log_file.flush()

     9 

    10 def SigUSR1Handler(signum, frame):

    11     print "Reacting on USR1 signal (signal 10)"

    12     global log_file

    13     log_file.close()

    14     log_file = open(LOG_FILE, 'a')

    15     return

    16 

    17 def init():

    18     if os.path.isfile('/var/usr/dump_test_log.pid'):

    19         print 'Have to stop server first'

    20         os.exit(1)

    21     else:

    22         print 'Starting server...'

    23         #write process id file

    24         f = open('/var/run/dump_test_log.pid', 'w')

    25         f.write(str(os.getpid()))

    26         f.flush()

    27         f.close()

    28         print 'Process start with pid ', os.getpid()

    29 

    30     signal.signal(signal.SIGUSR1, SigUSR1Handler)

    31 

    32 def main():

    33     init()

    34     count = 1

    35     while True:

    36       log('log line #%d, pid: %d' % (count, os.getpid()))

    37     count = count + 1

    38     time.sleep(1)

    39 

    40 if __name__ == '__main__':

    41     main()

    42