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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  corresponding
       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 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, 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(),
       sigsuspend()
       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 Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  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  Standard
       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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                        SIGADDSET(3P)