trusty (3) sigismember.3posix.gz

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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(), sigaction(),  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. Otherwise, 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>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- 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 .