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Linux 2.6 - man page for sigemptyset (linux section 3)

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

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

SYNOPSIS
       #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 || _POSIX_SOURCE

DESCRIPTION
       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  sig-
       fillset()  before being passed to the functions sigaddset(), sigdelset() and sigismember()
       or the additional glibc functions described below (sigisemptyset(), sigandset(), and  sig-
       orset()).  The results are undefined if this is not done.

RETURN VALUE
       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.  On error, these functions set errno to indicate the cause.

ERRORS
       EINVAL sig is not a valid signal.

CONFORMING TO
       POSIX.1-2001.

NOTES
   Glibc notes
       If  the	_GNU_SOURCE  feature  test  macro is defined, then <signal.h> exposes three other
       functions for manipulating signal sets:

       int sigisemptyset(const sigset_t *set);
       int sigorset(sigset_t *dest, const sigset_t *left,
		     const sigset_t *right);
       int sigandset(sigset_t *dest, const sigset_t *left,
		     const sigset_t *right);

       sigisemptyset() returns 1 if set contains no signals, and 0 otherwise.

       sigorset() places the union of the sets left and right in dest.	 sigandset()  places  the
       intersection  of the sets left and right in dest.  Both functions return 0 on success, and
       -1 on failure.

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

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

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2013-09-24				     SIGSETOPS(3)


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