2004-11-03 13:51:07 +00:00
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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2007-06-20 22:33:04 +00:00
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.TH "SIGADDSET" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.\" sigaddset
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.SH NAME
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sigaddset \- add a signal to a signal set
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.SH SYNOPSIS
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.LP
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\fB#include <signal.h>
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.br
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.sp
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int sigaddset(sigset_t *\fP\fIset\fP\fB, int\fP \fIsigno\fP\fB); \fP
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\fB
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIsigaddset\fP() function adds the individual signal specified
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by the \fIsigno\fP to the signal set pointed to by
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\fIset\fP.
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.LP
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Applications shall call either \fIsigemptyset\fP() or \fIsigfillset\fP()
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at least once for each object of type \fBsigset_t\fP prior to any
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other use
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of that object. If such an object is not initialized in this way,
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but is nonetheless supplied as an argument to any of \fIpthread_sigmask\fP(),
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\fIsigaction\fP(),
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\fIsigaddset\fP(), \fIsigdelset\fP(), \fIsigismember\fP(), \fIsigpending\fP(),
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\fIsigprocmask\fP(), \fIsigsuspend\fP(), \fIsigtimedwait\fP(), \fIsigwait\fP(),
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or \fIsigwaitinfo\fP(), the results are undefined.
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.SH RETURN VALUE
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.LP
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Upon successful completion, \fIsigaddset\fP() shall return 0; otherwise,
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it shall return -1 and set \fIerrno\fP to indicate
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the error.
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.SH ERRORS
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.LP
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The \fIsigaddset\fP() function may fail if:
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.TP 7
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.B EINVAL
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The value of the \fIsigno\fP argument is an invalid or unsupported
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signal number.
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.sp
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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None.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fISignal Concepts\fP , \fIsigaction\fP() , \fIsigdelset\fP() , \fIsigemptyset\fP()
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, \fIsigfillset\fP() , \fIsigismember\fP() , \fIsigpending\fP() ,
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\fIsigprocmask\fP() , \fIsigsuspend\fP() , the Base Definitions volume
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of IEEE\ Std\ 1003.1-2001, \fI<signal.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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