centos man page for sigismember

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 correspond-
       ing 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 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, sigismember() shall return 1 if the specified signal is a member of the specified set, or 0 if it is not. Oth-
       erwise, 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 unsupported signal number.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Signal Concepts, sigaction(), sigaddset(), sigdelset(), sigfillset(), sigemptyset(), 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 Technol-
       ogy -- 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 .

IEEE
/The Open Group						       2003							   SIGISMEMBER(3P)