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

NAME
       sigaddset - add a signal to a signal set

SYNOPSIS
       #include <signal.h>

       int sigaddset(sigset_t *set, int signo);

DESCRIPTION
       The  sigaddset()  function adds the individual signal specified by the signo to the signal
       set pointed to by set.

       Applications shall 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 initial-
       ized in this way, but is nonetheless supplied as an argument to any of  pthread_sigmask(),
       sigaction(), sigaddset(), sigdelset(), sigismember(), sigpending(), sigprocmask(), sigsus-
       pend(), sigtimedwait(), sigwait(), or sigwaitinfo(), the results are undefined.

RETURN VALUE
       Upon successful completion, sigaddset() shall return 0; otherwise, it shall return -1  and
       set errno to indicate the error.

ERRORS
       The sigaddset() function may fail if:

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

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Signal Concepts , sigaction() , sigdelset() , sigemptyset() , sigfillset() , sigismember()
       ,  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				     SIGADDSET(P)
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