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SIGDELSET(3P)              POSIX Programmer's Manual             SIGDELSET(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
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 none-
       theless supplied as an argument to  any  of  pthread_sigmask(),  sigac-
       tion(), sigaddset(), sigdelset(), sigismember(), sigpending(), sigproc-
       mask(), 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 unsup-
              ported signal number.

       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 Def-
       initions 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 original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                        SIGDELSET(3P)