1SIGISMEMBER(3P)            POSIX Programmer's Manual           SIGISMEMBER(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

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

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

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

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

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

47       None.
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APPLICATION USAGE

50       None.
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RATIONALE

53       None.
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FUTURE DIRECTIONS

56       None.
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SEE ALSO

59       Signal Concepts, sigaction(), sigaddset(),  sigdelset(),  sigfillset(),
60       sigemptyset(), sigpending(), sigprocmask(), sigsuspend(), the Base Def‐
61       initions volume of IEEE Std 1003.1-2001, <signal.h>
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64       Portions of this text are reprinted and reproduced in  electronic  form
65       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
66       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
67       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
68       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
69       event of any discrepancy between this version and the original IEEE and
70       The Open Group Standard, the original IEEE and The Open Group  Standard
71       is  the  referee document. The original Standard can be obtained online
72       at http://www.opengroup.org/unix/online.html .
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76IEEE/The Open Group                  2003                      SIGISMEMBER(3P)
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