sigsetops man page on NeXTSTEP

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SIGSETOPS(3P)							 SIGSETOPS(3P)

NAME
       sigemptyset,  sigfillset,  sigaddset,  sigdelset,  sigismember - (POSIX
       only) manipulate signal sets.

SYNOPSIS
       #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(const sigset_t *set, int signo);

DESCRIPTION
       The  information	 in  this  specification   applies   only   to	 POSIX
       applications.

       The  sigsetops  primitives manipulate sets of signals.  They operate on
       data objects addressable by the application, not on any set of  signals
       known to the system, such as the set blocked from delivery to a process
       or the set pending for a process.

       The sigemptyset function initializes the signal set pointed to  by  the
       argument set, such that all signals are excluded.

       The  sigfillset	function  initializes the signal set pointed to by the
       argument set, such that all signals are included.

       The sigaddset and sigdelset functions respectively add  or  delete  the
       individual  signal  specified  by the value of the argument signo to or
       from the signal set pointed to by the argument set.

       The sigismember function tests whether  the  signal  specified  by  the
       value  of  the  argument signo is a member of the set pointed to by the
       argument set.

RETURNS
       Upon successful completion, the sigismember function returns a value of
       one  if	the  specified	signal	is a member of the specified set, or a
       value of zero if it is not.   Upon  successful  completion,  the	 other
       functions  return  a value of zero.  For all of the above functions, if
       an error is detected, a value of -1 is returned, and errno  is  set  to
       indicate the error.

ERRORS
       [EINVAL]	      The  value  of  the  signo  argument  is	an  invalid or
		      unsupported signal number.

SEE ALSO
       sigaction(2P), sigprocmask(2P)

				August 1, 1992			 SIGSETOPS(3P)
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