A signal interrupts a blocking syscall. You can call PyErr_CheckSignals() that may execute Python signal handler before you restart the syscal on EINTR in C co

A signal interrupts a blocking syscall. You can call PyErr_CheckSignals() that may execute Python signal handler before you restart the syscal on EINTR in C code. Look at how os.waitpid() is implemented: https://github.com/python/cpython/blob/master/Modules/posixmodule.c https://github.com/python/cpython/blob/master/Modules/posixm...