1SIGADDSET(3P)              POSIX Programmer's Manual             SIGADDSET(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       sigaddset — add a signal to a signal set
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SYNOPSIS

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

20       The sigaddset() function adds the individual signal  specified  by  the
21       signo to the signal set pointed to by set.
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23       Applications  shall  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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RETURN VALUE

32       Upon  successful  completion, sigaddset() shall return 0; otherwise, it
33       shall return -1 and set errno to indicate the error.
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ERRORS

36       The sigaddset() function may fail if:
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38       EINVAL The value of the signo argument is  an  invalid  or  unsupported
39              signal number.
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41       The following sections are informative.
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EXAMPLES

44       None.
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APPLICATION USAGE

47       None.
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RATIONALE

50       None.
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FUTURE DIRECTIONS

53       None.
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SEE ALSO

56       Section   2.4,   Signal   Concepts,   pthread_sigmask(),   sigaction(),
57       sigdelset(), sigemptyset(), sigfillset(), sigismember(),  sigpending(),
58       sigsuspend()
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60       The Base Definitions volume of POSIX.1‐2017, <signal.h>
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63       Portions  of  this text are reprinted and reproduced in electronic form
64       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
65       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
66       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
67       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
68       event of any discrepancy between this version and the original IEEE and
69       The  Open Group Standard, the original IEEE and The Open Group Standard
70       is the referee document. The original Standard can be  obtained  online
71       at http://www.opengroup.org/unix/online.html .
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73       Any  typographical  or  formatting  errors that appear in this page are
74       most likely to have been introduced during the conversion of the source
75       files  to  man page format. To report such errors, see https://www.ker‐
76       nel.org/doc/man-pages/reporting_bugs.html .
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80IEEE/The Open Group                  2017                        SIGADDSET(3P)
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