#include <signal.h> int sigemptyset (sigset_t *set)
This function initializes the set of signals pointed to by set to
exclude all signals known to the DJGPP runtime system. Such an empty
set, if passed to sigprocmask (see section sigprocmask), will cause
all signals to be passed immediately to their handlers.
0 upon success, -1 if set is a NULL pointer.
not ANSI, POSIX
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