Module signal

This module provides mechanisms to use signal handlers in Python.

Functions:

alarm() -- cause SIGALRM after a specified time [Unix only] signal() -- set the action for a given signal getsignal() -- get the signal action for a given signal pause() -- wait until a signal arrives [Unix only] default_int_handler() -- default SIGINT handler

Constants:

SIG_DFL -- used to refer to the system default handler SIG_IGN -- used to ignore the signal NSIG -- number of defined signals

SIGINT, SIGTERM, etc. -- signal numbers

*** IMPORTANT NOTICE *** A signal handler function is called with two arguments: the first is the signal number, the second is the interrupted stack frame.

Functions

[hide private]

alarm(seconds)
Arrange for SIGALRM to arrive after the given number of seconds.

default_int_handler(...)
The default handler for SIGINT installed by Python.

action

getsignal(sig)
Return the current action for the given signal.

pause()
Wait until a signal arrives.

action

signal(sig, action)
Set the action for the given signal.

Variables

[hide private]

NSIG = 65

SIGABRT = 6

SIGALRM = 14

SIGBUS = 7

SIGCHLD = 17

SIGCLD = 17

SIGCONT = 18

SIGFPE = 8

SIGHUP = 1

SIGILL = 4

SIGINT = 2

SIGIO = 29

SIGIOT = 6

SIGKILL = 9

SIGPIPE = 13

SIGPOLL = 29

SIGPROF = 27

SIGPWR = 30

SIGQUIT = 3

SIGRTMAX = 64

SIGRTMIN = 34

SIGSEGV = 11

SIGSTOP = 19

SIGSYS = 31

SIGTERM = 15

SIGTRAP = 5

SIGTSTP = 20

SIGTTIN = 21

SIGTTOU = 22

SIGURG = 23

SIGUSR1 = 10

SIGUSR2 = 12

SIGVTALRM = 26

SIGWINCH = 28

SIGXCPU = 24

SIGXFSZ = 25

SIG_DFL = 0

SIG_IGN = 1

Function Details

[hide private]

default_int_handler(...)

The default handler for SIGINT installed by Python. It raises KeyboardInterrupt.

getsignal(sig)

Return the current action for the given signal. The return value can be: SIG_IGN -- if the signal is being ignored SIG_DFL -- if the default action for the signal is in effect None -- if an unknown handler is in effect anything else -- the callable Python object used as a handler

Returns: action

signal(sig, action)

Set the action for the given signal. The action can be SIG_DFL, SIG_IGN, or a callable Python object. The previous action is returned. See getsignal() for possible return values.

*** IMPORTANT NOTICE *** A signal handler function is called with two arguments: the first is the signal number, the second is the interrupted stack frame.

Returns: action