1SIGISMEMBER(3P) POSIX Programmer's Manual SIGISMEMBER(3P)
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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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12 sigismember — test for a signal in a signal set
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15 #include <signal.h>
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17 int sigismember(const sigset_t *set, int signo);
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20 The sigismember() function shall test whether the signal specified by
21 signo is a member of the set pointed to by set.
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23 Applications should call either sigemptyset() or sigfillset() at least
24 once for each object of type sigset_t prior to any other use of that
25 object. If such an object is not initialized in this way, but is none‐
26 theless supplied as an argument to any of pthread_sigmask(), sigac‐
27 tion(), sigaddset(), sigdelset(), sigismember(), sigpending(), sigproc‐
28 mask(), sigsuspend(), sigtimedwait(), sigwait(), or sigwaitinfo(), the
29 results are undefined.
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32 Upon successful completion, sigismember() shall return 1 if the speci‐
33 fied signal is a member of the specified set, or 0 if it is not. Other‐
34 wise, it shall return -1 and set errno to indicate the error.
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37 The sigismember() function may fail if:
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39 EINVAL The signo argument is not a valid signal number, or is an unsup‐
40 ported signal number.
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42 The following sections are informative.
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45 None.
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48 None.
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57 Section 2.4, Signal Concepts, pthread_sigmask(), sigaction(),
58 sigaddset(), sigdelset(), sigfillset(), sigemptyset(), sigpending(),
59 sigsuspend()
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61 The Base Definitions volume of POSIX.1‐2017, <signal.h>
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64 Portions of this text are reprinted and reproduced in electronic form
65 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
66 table Operating System Interface (POSIX), The Open Group Base Specifi‐
67 cations Issue 7, 2018 Edition, Copyright (C) 2018 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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74 Any typographical or formatting errors that appear in this page are
75 most likely to have been introduced during the conversion of the source
76 files to man page format. To report such errors, see https://www.ker‐
77 nel.org/doc/man-pages/reporting_bugs.html .
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81IEEE/The Open Group 2017 SIGISMEMBER(3P)