SIGSETOPS(3) Library Functions Manual SIGSETOPS(3)

sigaddset, sigdelset, sigemptyset, sigfillset, sigismembermanipulate signal sets

Standard C Library (libc, -lc)

#include <signal.h>

int
sigaddset(sigset_t *set, int signo);

int
sigdelset(sigset_t *set, int signo);

int
sigemptyset(sigset_t *set);

int
sigfillset(sigset_t *set);

int
sigismember(const sigset_t *set, int signo);

These functions manipulate signal sets, stored in a sigset_t. Either () or sigfillset() must be called for every object of type sigset_t before any other use of the object.

The () function initializes a signal set to be empty.

The () function initializes a signal set to contain all signals.

The () function adds the specified signal signo to the signal set.

The () function deletes the specified signal signo from the signal set.

The () function returns whether a specified signal signo is contained in the signal set.

These functions are provided as macros in the include file <signal.h>. Actual functions are available if their names are undefined (with #undef ).

The sigismember() function returns 1 if the signal is a member of the set, 0 otherwise. The other functions return 0.

Currently, no errors are detected.

kill(2), sigaction(2), sigsuspend(2)

These functions are defined by IEEE Std 1003.1-1988 (“POSIX.1”).

June 4, 1993 macOS 14.4