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SIGISMEMBER(3P)            POSIX Programmer's Manual           SIGISMEMBER(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
       sigismember -- test for a signal in a signal set
SYNOPSIS
       #include <signal.h>
       int sigismember(const sigset_t *set, int signo);
DESCRIPTION
       The sigismember() function shall test whether the signal  specified  by
       signo is a member of the 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 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, sigismember() shall return 1 if the speci-
       fied signal is a member of the specified set, or 0 if it is not. Other-
       wise, it shall return -1 and set errno to indicate the error.
ERRORS
       The sigismember() function may fail if:
       EINVAL The signo argument is not a valid signal number, or is an unsup-
              ported 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(),  sigdelset(),  sigfillset(),  sigemptyset(), 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                      SIGISMEMBER(3P)