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

13       sigaddset — add a signal to a signal set
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SYNOPSIS

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

21       The sigaddset() function adds the individual signal  specified  by  the
22       signo to the signal set pointed to by set.
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24       Applications  shall  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, sigaddset() shall return 0; otherwise, it
34       shall return −1 and set errno to indicate the error.
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ERRORS

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

45       None.
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APPLICATION USAGE

48       None.
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RATIONALE

51       None.
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FUTURE DIRECTIONS

54       None.
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SEE ALSO

57       Section   2.4,   Signal   Concepts,   pthread_sigmask(),   sigaction(),
58       sigdelset(), sigemptyset(), sigfillset(), sigismember(),  sigpending(),
59       sigsuspend()
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61       The Base Definitions volume of POSIX.1‐2008, <signal.h>
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64       Portions  of  this text are reprinted and reproduced in electronic form
65       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
66       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
67       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
68       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
69       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
70       event of any discrepancy between this version and the original IEEE and
71       The Open Group Standard, the original IEEE and The Open Group  Standard
72       is  the  referee document. The original Standard can be obtained online
73       at http://www.unix.org/online.html .
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75       Any typographical or formatting errors that appear  in  this  page  are
76       most likely to have been introduced during the conversion of the source
77       files to man page format. To report such errors,  see  https://www.ker‐
78       nel.org/doc/man-pages/reporting_bugs.html .
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82IEEE/The Open Group                  2013                        SIGADDSET(3P)
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