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  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

       Section  2.4, Signal Concepts, pthread_sigmask(), sigaction(), sigaddset(), sigemptyset(),
       sigfillset(), sigismember(), sigpending(), sigsuspend()

       The Base Definitions volume of POSIX.1‐2017, <signal.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  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 .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .