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

13       sigismember — test for a signal in a signal set
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SYNOPSIS

16       #include <signal.h>
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18       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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43       The following sections are informative.
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EXAMPLES

46       None.
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APPLICATION USAGE

49       None.
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RATIONALE

52       None.
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FUTURE DIRECTIONS

55       None.
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SEE ALSO

58       Section   2.4,   Signal   Concepts,   pthread_sigmask(),   sigaction(),
59       sigaddset(),  sigdelset(),  sigfillset(),  sigemptyset(), sigpending(),
60       sigsuspend()
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62       The Base Definitions volume of POSIX.1‐2008, <signal.h>
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65       Portions of this text are reprinted and reproduced in  electronic  form
66       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
67       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
68       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
69       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
70       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
71       event of any discrepancy between this version and the original IEEE and
72       The  Open Group Standard, the original IEEE and The Open Group Standard
73       is the referee document. The original Standard can be  obtained  online
74       at http://www.unix.org/online.html .
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83IEEE/The Open Group                  2013                      SIGISMEMBER(3P)
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