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SIGSETOPS(3) Library Functions Manual SIGSETOPS(3)

sigemptyset, sigfillset, sigaddset, sigdelset, sigismembermanipulate signal sets

library “libc”

#include <signal.h>

int
sigemptyset(sigset_t *set);

int
sigfillset(sigset_t *set);

int
sigaddset(sigset_t *set, int signo);

int
sigdelset(sigset_t *set, int signo);

int
sigismember(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.

() and sigfillset() are provided as macros, but 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, a 0 otherwise. The other functions return 0 upon success. A -1 return value indicates an error occurred and the global variable errno is set to indicate the reason.

These functions could fail if one of the following occurs:

[]
signo has an invalid value.

kill(2), sigaction(2), sigsuspend(2), signal(7)

These functions conform to IEEE Std 1003.1-1990 (“POSIX.1”).

June 4, 1993 NetBSD-9.2