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SIGISMEMBER(P)			    POSIX Programmer's Manual			   SIGISMEMBER(P)

NAME
       sigismember - test for a signal in a signal set

SYNOPSIS
       #include <signal.h>

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

DESCRIPTION
       The sigismember() function shall test whether the signal specified by signo is a member of
       the set pointed to by set.

       Applications should call either sigemptyset() or  sigfillset()  at  least  once	for  each
       object  of  type  sigset_t prior to any other use of that object. If such an object is not
       initialized in this way, but is nonetheless supplied as an argument to any of pthread_sig-
       mask(), sigaction(), sigaddset(), sigdelset(), sigismember(), sigpending(), sigprocmask(),
       sigsuspend(), sigtimedwait(), sigwait(), or sigwaitinfo(), the results are undefined.

RETURN VALUE
       Upon successful completion, sigismember() shall return 1 if the specified signal is a mem-
       ber  of	the specified set, or 0 if it is not. Otherwise, it shall return -1 and set errno
       to indicate the error.

ERRORS
       The sigismember() function may fail if:

       EINVAL The signo argument is not a valid signal number, or is an unsupported  signal  num-
	      ber.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Signal Concepts , sigaction() , sigaddset() , sigdelset() , sigfillset() , sigemptyset() ,
       sigpending()  ,	sigprocmask()  ,  sigsuspend()	,  the	 Base	Definitions   volume   of
       IEEE Std 1003.1-2001, <signal.h>

COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				   SIGISMEMBER(P)
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