posix man page for sigaddset

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

PROLOG
       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
       sigaddset -- add a signal to a signal set

SYNOPSIS
       #include <signal.h>

       int sigaddset(sigset_t *set, int signo);

DESCRIPTION
       The sigaddset() function adds the individual signal specified by the signo to the signal set pointed to by set.

       Applications shall 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(), sigac-
       tion(), sigaddset(), sigdelset(), sigismember(), sigpending(), sigprocmask(), sigsuspend(), sigtimedwait(),  sigwait(),	or  sigwaitinfo(),
       the results are undefined.

RETURN VALUE
       Upon successful completion, sigaddset() shall return 0; otherwise, it shall return -1 and set errno to indicate the error.

ERRORS
       The sigaddset() function may fail if:

       EINVAL The value of the signo argument is an invalid or 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(), sigdelset(), sigemptyset(), sigfillset(), sigismember(), sigpending(), sig-
       suspend()

       The Base Definitions volume of POSIX.1-2008, <signal.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/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 .

IEEE
/The Open Group						       2013							     SIGADDSET(3P)