all Python 3signalfunction

signal.getsignal()

handlers

Returns the current handler of a signal: a function, SIG_IGN, SIG_DFL, or None when the handler was not installed from Python.

Syntax

signal.getsignal(signalnum)

For SIGINT the default answer is not SIG_DFL but signal.default_int_handler: that is what turns Ctrl+C into KeyboardInterrupt. None does not mean 'no handler' but 'installed from C code', and passing None back to signal.signal fails with TypeError. So for a temporary swap keep whatever signal.signal itself returned and use getsignal only for inspection.

Examples

import signal
print(signal.getsignal(signal.SIGINT) is signal.default_int_handler)  # → True
print(signal.getsignal(signal.SIGTERM) == signal.SIG_DFL)  # → True
try:
    signal.signal(signal.SIGTERM, None)
except TypeError:
    print('None обратно не поставить')  # → None обратно не поставить

See also

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