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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SIGDELSET" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" sigdelset 
+.SH PROLOG
+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.
+.SH NAME
+sigdelset \- delete a signal from a signal set
+.SH SYNOPSIS
+.LP
+\fB#include <signal.h>
+.br
+.sp
+int sigdelset(sigset_t *\fP\fIset\fP\fB, int\fP \fIsigno\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIsigdelset\fP() function deletes the individual signal specified
+by \fIsigno\fP from the signal set pointed to by
+\fIset\fP.
+.LP
+Applications should call either \fIsigemptyset\fP() or \fIsigfillset\fP()
+at least once for each object of type \fBsigset_t\fP 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 any of \fIpthread_sigmask\fP(),
+\fIsigaction\fP(), \fIsigaddset\fP(), \fIsigdelset\fP(), \fIsigismember\fP(),
+\fIsigpending\fP(), \fIsigprocmask\fP(), \fIsigsuspend\fP(), \fIsigtimedwait\fP(),
+\fIsigwait\fP(), or \fIsigwaitinfo\fP(), the results are undefined.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIsigdelset\fP() shall return 0; otherwise,
+it shall return -1 and set \fIerrno\fP to indicate
+the error.
+.SH ERRORS
+.LP
+The \fIsigdelset\fP() function may fail if:
+.TP 7
+.B EINVAL
+The \fIsigno\fP argument is not a valid signal number, or is an unsupported
+signal number.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fISignal Concepts\fP, \fIsigaction\fP(), \fIsigaddset\fP(), \fIsigemptyset\fP(),
+\fIsigfillset\fP(), \fIsigismember\fP(), \fIsigpending\fP(),
+\fIsigprocmask\fP(), \fIsigsuspend\fP(), the Base Definitions volume
+of IEEE\ Std\ 1003.1-2001, \fI<signal.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. 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
+http://www.opengroup.org/unix/online.html .