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signal.siginterrupt()

handlers

Sets whether system calls are interrupted by signal signalnum or restarted. Unix only (Linux, macOS).

Syntax

signal.siginterrupt(signalnum, flag)

Since Python 3.5 (PEP 475) the interpreter itself retries interrupted calls like read and sleep unless the handler raised, so in Python code the effect is barely visible. Every signal.signal call re-enables interruption for its signal, so call siginterrupt after installing the handler, not before. To break out of a wait, the handler has to raise.

Examples

import signal, time
got = []
old = signal.signal(signal.SIGALRM, lambda s, f: got.append(s))
signal.siginterrupt(signal.SIGALRM, False)  # после signal.signal, не до
signal.setitimer(signal.ITIMER_REAL, 0.01)
time.sleep(0.05)  # сон не оборвался: Python повторяет вызов сам
signal.setitimer(signal.ITIMER_REAL, 0)
signal.signal(signal.SIGALRM, old)
print(got == [signal.SIGALRM])  # → True

See also

Common errors

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