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_sigmask(),  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
              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  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
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .