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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 .