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

NAME
       sigdelset - delete a signal from a signal set

SYNOPSIS
       #include <signal.h>

       int sigdelset(sigset_t *set, int signo);

DESCRIPTION
       The  sigdelset() function deletes the individual signal specified by signo from the signal
       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, sigdelset() shall return 0; otherwise, it shall return -1  and
       set errno to indicate the error.

ERRORS
       The sigdelset() 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() , 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				     SIGDELSET(P)
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