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This module provides mechanisms to use signal handlers in Python.
Functions:
alarm() -- cause SIGALRM after a specified time [Unix only]
setitimer() -- cause a signal (described below) after a specified
float time and the timer may restart then [Unix only]
getitimer() -- get current value of timer [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
signal 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
itimer constants:
ITIMER_REAL -- decrements in real time, and delivers SIGALRM upon
expiration
ITIMER_VIRTUAL -- decrements only when the process is executing,
and delivers SIGVTALRM upon expiration
ITIMER_PROF -- decrements both when the process is executing and
when the system is executing on behalf of the process.
Coupled with ITIMER_VIRTUAL, this timer is usually
used to profile the time spent by the application
in user and kernel space. SIGPROF is delivered upon
expiration.
with_traceback(...)
Exception.with_traceback(tb) --
set self.__traceback__ to tb and return self.
args = <attribute 'args' of 'BaseException' objects>
characters_written = <attribute 'characters_written' of 'OSError' objects>
errno = <member 'errno' of 'OSError' objects> POSIX exception code
filename = <member 'filename' of 'OSError' objects> exception filename
filename2 = <member 'filename2' of 'OSError' objects> second exception filename
strerror = <member 'strerror' of 'OSError' objects> exception strerror
struct_siginfo: Result from sigwaitinfo or sigtimedwait. This object may be accessed either as a tuple of (si_signo, si_code, si_errno, si_pid, si_uid, si_status, si_band), or via the attributes si_signo, si_code, and so on.
count(self, value, /) Return number of occurrences of value.
index(self, value, start=0, stop=9223372036854775807, /) Return first index of value. Raises ValueError if the value is not present.
n_fields = 7
n_sequence_fields = 7
n_unnamed_fields = 0
si_band = <member 'si_band' of 'signal.struct_siginfo' objects> band event for SIGPOLL
si_code = <member 'si_code' of 'signal.struct_siginfo' objects> signal code
si_errno = <member 'si_errno' of 'signal.struct_siginfo' objects> errno associated with this signal
si_pid = <member 'si_pid' of 'signal.struct_siginfo' objects> sending process ID
si_signo = <member 'si_signo' of 'signal.struct_siginfo' objects> signal number
si_status = <member 'si_status' of 'signal.struct_siginfo' objects> exit value or signal
si_uid = <member 'si_uid' of 'signal.struct_siginfo' objects> real user ID of sending process
alarm(seconds, /) Arrange for SIGALRM to arrive after the given number of seconds.
default_int_handler(signalnum, frame, /) The default handler for SIGINT installed by Python. It raises KeyboardInterrupt.
getitimer(which, /) Returns current value of given itimer.
getsignal(signalnum, /)
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
pause() Wait until a signal arrives.
pidfd_send_signal(pidfd, signalnum, siginfo=None, flags=0, /) Send a signal to a process referred to by a pid file descriptor.
pthread_kill(thread_id, signalnum, /) Send a signal to a thread.
pthread_sigmask(how, mask, /) Fetch and/or change the signal mask of the calling thread.
raise_signal(signalnum, /) Send a signal to the executing process.
set_wakeup_fd(...) set_wakeup_fd(fd, *, warn_on_full_buffer=True) -> fd Sets the fd to be written to (with the signal number) when a signal comes in. A library can use this to wakeup select or poll. The previous fd or -1 is returned. The fd must be non-blocking.
setitimer(which, seconds, interval=0.0, /) Sets given itimer (one of ITIMER_REAL, ITIMER_VIRTUAL or ITIMER_PROF). The timer will fire after value seconds and after that every interval seconds. The itimer can be cleared by setting seconds to zero. Returns old values as a tuple: (delay, interval).
siginterrupt(signalnum, flag, /) Change system call restart behaviour. If flag is False, system calls will be restarted when interrupted by signal sig, else system calls will be interrupted.
signal(signalnum, handler, /) 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.
sigpending() Examine pending signals. Returns a set of signal numbers that are pending for delivery to the calling thread.
sigtimedwait(sigset, timeout, /) Like sigwaitinfo(), but with a timeout. The timeout is specified in seconds, with floating point numbers allowed.
sigwait(sigset, /) Wait for a signal. Suspend execution of the calling thread until the delivery of one of the signals specified in the signal set sigset. The function accepts the signal and returns the signal number.
sigwaitinfo(sigset, /) Wait synchronously until one of the signals in *sigset* is delivered. Returns a struct_siginfo containing information about the signal.
strsignal(signalnum, /) Return the system description of the given signal. The return values can be such as "Interrupt", "Segmentation fault", etc. Returns None if the signal is not recognized.
valid_signals() Return a set of valid signal numbers on this platform. The signal numbers returned by this function can be safely passed to functions like `pthread_sigmask`.
ITIMER_PROF = 2
ITIMER_REAL = 0
ITIMER_VIRTUAL = 1
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_BLOCK = 0
SIG_DFL = 0
SIG_IGN = 1
SIG_SETMASK = 2
SIG_UNBLOCK = 1