Section: POSIX Programmer's Manual (3P)
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
--- add a signal to a signal set
int sigaddset(sigset_t *set, int signo);
function adds the individual signal specified by the
to the signal set pointed to by
Applications shall call either
at least once for each object of type
prior to any other use of that object. If such an object is not
initialized in this way, but is nonetheless supplied as an argument to
the results are undefined.
Upon successful completion,
shall return 0; otherwise, it shall return -1 and set
to indicate the error.
function may fail if:
The value of the
argument is an invalid or unsupported signal number.
The following sections are informative.
, Signal Concepts,
The Base Definitions volume of POSIX.1-2008,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
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