1SIGISMEMBER(P)             POSIX Programmer's Manual            SIGISMEMBER(P)
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NAME

6       sigismember - test for a signal in a signal set
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SYNOPSIS

9       #include <signal.h>
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11       int sigismember(const sigset_t *set, int signo);
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DESCRIPTION

15       The  sigismember()  function shall test whether the signal specified by
16       signo is a member of the set pointed to by set.
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18       Applications should call either sigemptyset() or sigfillset() at  least
19       once  for  each  object of type sigset_t prior to any other use of that
20       object. If such an object is not initialized in this way, but is  none‐
21       theless  supplied  as  an  argument to any of pthread_sigmask(), sigac‐
22       tion(), sigaddset(), sigdelset(), sigismember(), sigpending(), sigproc‐
23       mask(),  sigsuspend(), sigtimedwait(), sigwait(), or sigwaitinfo(), the
24       results are undefined.
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RETURN VALUE

27       Upon successful completion, sigismember() shall return 1 if the  speci‐
28       fied signal is a member of the specified set, or 0 if it is not. Other‐
29       wise, it shall return -1 and set errno to indicate the error.
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ERRORS

32       The sigismember() function may fail if:
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34       EINVAL The signo argument is not a valid signal number, or is an unsup‐
35              ported signal number.
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38       The following sections are informative.
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EXAMPLES

41       None.
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APPLICATION USAGE

44       None.
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RATIONALE

47       None.
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FUTURE DIRECTIONS

50       None.
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SEE ALSO

53       Signal  Concepts  ,  sigaction()  ,  sigaddset()  ,  sigdelset() , sig‐
54       fillset() , sigemptyset() , sigpending() , sigprocmask() , sigsuspend()
55       , the Base Definitions volume of IEEE Std 1003.1-2001, <signal.h>
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58       Portions  of  this text are reprinted and reproduced in electronic form
59       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
60       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
61       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
62       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
63       event of any discrepancy between this version and the original IEEE and
64       The  Open Group Standard, the original IEEE and The Open Group Standard
65       is the referee document. The original Standard can be  obtained  online
66       at http://www.opengroup.org/unix/online.html .
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70IEEE/The Open Group                  2003                       SIGISMEMBER(P)
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