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SIGSETOPS(3)               Linux Programmer's Manual              SIGSETOPS(3)

       sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX signal set operations.

       #include <signal.h>

       int sigemptyset(sigset_t *set);

       int sigfillset(sigset_t *set);

       int sigaddset(sigset_t *set, int signum);

       int sigdelset(sigset_t *set, int signum);

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

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sigemptyset(), sigfillset(), sigaddset(), sigdelset(), sigismember(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE ||

       These functions allow the manipulation of POSIX signal sets.

       sigemptyset() initializes the signal set given by set to empty, with all signals excluded from the set.

       sigfillset() initializes set to full, including all signals.

       sigaddset() and sigdelset() add and delete respectively signal signum from set.

       sigismember() tests whether signum is a member of set.

       Objects of type sigset_t must be initialized by a call to either sigemptyset()  or  sigfillset()  before  being
       passed  to the functions sigaddset(), sigdelset() and sigismember() or the additional glibc functions described
       below (sigisemptyset(), sigandset(), and sigorset()).  The results are undefined if this is not done.

       sigemptyset(), sigfillset(), sigaddset(), and sigdelset() return 0 on success and -1 on error.

       sigismember() returns 1 if signum is a member of set, 0 if signum is not a member, and -1 on error.

       EINVAL sig is not a valid signal.


   Glibc Notes
       If the _GNU_SOURCE feature test macro is defined, then <signal.h> exposes three other functions for  manipulat-
       ing signal sets.

       int sigisemptyset(sigset_t *set);
              returns 1 if set contains no signals, and 0 otherwise.

       int sigorset(sigset_t *dest, sigset_t *left, sigset_t *right);
              places the union of the sets left and right in dest.

       int sigandset(sigset_t *dest, sigset_t *left, sigset_t *right);
              places the intersection of the sets left and right in dest.

       sigorset() and sigandset() return 0 on success, and -1 on failure.

       These  functions  are  non-standard  (a  few  other  systems provide similar functions) and their use should be
       avoided in portable applications.

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

       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at

Linux                             2008-09-01                      SIGSETOPS(3)