#include <signal.h> int sigismember (sigset_t *set, int signo)
This function checks whether the signal specified by signo is a member of the set of signals pointed to by set.
1 if the specified signal is a member of the set, 0 if it isn't, or if signo specifies an unknown signal, -1 if set is a NULL pointer.
not ANSI, POSIX
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