signal.alarm(0) # Disable the alarm

Note on SIGPIPE

---------------

Piping output of your program to tools like :manpage:`head(1)` will

cause a :const:`SIGPIPE` signal to be sent to your process when the receiver

of its standard output closes early. This results in an exception

like :code:`BrokenPipeError: [Errno 32] Broken pipe`. To handle this

case, wrap your entry point to catch this exception as follows::

import os

import sys

def main():

try:

# simulate large output (your code replaces this loop)

for x in range(10000):

print("y")

# flush output here to force SIGPIPE to be triggered

# while inside this try block.

sys.stdout.flush()

except BrokenPipeError:

# Python flushes standard streams on exit; redirect remaining output

# to devnull to avoid another BrokenPipeError at shutdown

devnull = os.open(os.devnull, os.O_WRONLY)

os.dup2(devnull, sys.stdout.fileno())

sys.exit(1) # Python exits with error code 1 on EPIPE

if __name__ == '__main__':

main()

Do not set :const:`SIGPIPE`'s disposition to :const:`SIG_DFL`

in order to avoid :exc:`BrokenPipeError`. Doing that would cause

your program to exit unexpectedly also whenever any socket connection

is interrupted while your program is still writing to it.