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SIGADDSET(3) Library Functions Manual SIGADDSET(3)

sigemptyset, sigfillset, sigaddset, sigdelset, sigismembermanipulate signal sets

#include <signal.h>

sigemptyset(sigset_t *set);

sigfillset(sigset_t *set);

sigaddset(sigset_t *set, int signo);

sigdelset(sigset_t *set, int signo);

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. sigemptyset() and sigfillset() are provided as macros, but actual functions are available if their names are undefined (with #undef name).

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

() initializes a signal set to contain all signals.

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

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

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

The sigismember() function returns 1 if the signal is a member of the set and 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 may fail if one of the following occurs:

The specified signal signo is not a valid signal number.

kill(2), sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)

These functions are defined by IEEE Std 1003.1-1990 (“POSIX.1”).

May 29, 2017 OpenBSD-6.4