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+.\" $Xorg: XtAppASig.man,v 1.3 2000/08/17 19:41:57 cpqbld Exp $
+.\"
+.\" Copyright (c) 1993, 1994  X Consortium
+.\" 
+.\" Permission is hereby granted, free of charge, to any person obtaining a
+.\" copy of this software and associated documentation files (the "Software"), 
+.\" to deal in the Software without restriction, including without limitation 
+.\" the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+.\" and/or sell copies of the Software, and to permit persons to whom the 
+.\" Software furnished to do so, subject to the following conditions:
+.\" 
+.\" The above copyright notice and this permission notice shall be included in
+.\" all copies or substantial portions of the Software.
+.\" 
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL 
+.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
+.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF 
+.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
+.\" SOFTWARE.
+.\" 
+.\" Except as contained in this notice, the name of the X Consortium shall not 
+.\" be used in advertising or otherwise to promote the sale, use or other 
+.\" dealing in this Software without prior written authorization from the 
+.\" X Consortium.
+.\"
+.\" $XFree86: xc/doc/man/Xt/XtAppASig.man,v 1.2 2001/01/27 18:20:23 dawes Exp $
+.\"
+.ds tk X Toolkit
+.ds xT X Toolkit Intrinsics \- C Language Interface
+.ds xI Intrinsics
+.ds xW X Toolkit Athena Widgets \- C Language Interface
+.ds xL Xlib \- C Language X Interface
+.ds xC Inter-Client Communication Conventions Manual
+.ds Rn 3
+.ds Vn 2.2
+.hw XtApp-Add-Signal wid-get
+.na
+.de Ds
+.nf
+.\\$1D \\$2 \\$1
+.ft 1
+.ps \\n(PS
+.\".if \\n(VS>=40 .vs \\n(VSu
+.\".if \\n(VS<=39 .vs \\n(VSp
+..
+.de De
+.ce 0
+.if \\n(BD .DF
+.nr BD 0
+.in \\n(OIu
+.if \\n(TM .ls 2
+.sp \\n(DDu
+.fi
+..
+.de FD
+.LP
+.KS
+.TA .5i 3i
+.ta .5i 3i
+.nf
+..
+.de FN
+.fi
+.KE
+.LP
+..
+.de IN		\" send an index entry to the stderr
+..
+.de C{
+.KS
+.nf
+.D
+.\"
+.\"	choose appropriate monospace font
+.\"	the imagen conditional, 480,
+.\"	may be changed to L if LB is too
+.\"	heavy for your eyes...
+.\"
+.ie "\\*(.T"480" .ft L
+.el .ie "\\*(.T"300" .ft L
+.el .ie "\\*(.T"202" .ft PO
+.el .ie "\\*(.T"aps" .ft CW
+.el .ft R
+.ps \\n(PS
+.ie \\n(VS>40 .vs \\n(VSu
+.el .vs \\n(VSp
+..
+.de C}
+.DE
+.R
+..
+.de Pn
+.ie t \\$1\fB\^\\$2\^\fR\\$3
+.el \\$1\fI\^\\$2\^\fP\\$3
+..
+.de ZN
+.ie t \fB\^\\$1\^\fR\\$2
+.el \fI\^\\$1\^\fP\\$2
+..
+.de NT
+.ne 7
+.ds NO Note
+.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
+.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
+.ie n .sp
+.el .sp 10p
+.TB
+.ce
+\\*(NO
+.ie n .sp
+.el .sp 5p
+.if '\\$1'C' .ce 99
+.if '\\$2'C' .ce 99
+.in +5n
+.ll -5n
+.R
+..
+.		\" Note End -- doug kraft 3/85
+.de NE
+.ce 0
+.in -5n
+.ll +5n
+.ie n .sp
+.el .sp 10p
+..
+.ny0
+.TH XtAppAddSignal __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
+.SH NAME
+XtAppAddSignal, XtRemoveSignal, XtNoticeSignal \- register and remove a signal source
+.SH SYNTAX
+.HP
+XtSignalId XtAppAddSignal(XtAppContext \fIapp_context\fP, XtSignalCallbackProc
+\fIproc\fP, XtPointer \fIclient_data\fP); 
+.HP
+void XtRemoveSignal(XtSignalId \fIid\fP); 
+.HP
+void XtNoticeSignal(XtSignalId \fIid\fP); 
+.SH ARGUMENTS
+.IP \fIapp_context\fP 1i
+Specifies the application context.
+.IP \fIclient_data\fP 1i
+Specifies the argument that is to be passed to the specified procedure
+when a signal has been raised.
+.IP \fIid\fP 1i
+Specifies the ID returned from the corresponding
+.ZN XtAppAddSignal
+call.
+.IP \fIproc\fP 1i
+Specifies the procedure that is to be called when the signal has been 
+raised.
+.SH DESCRIPTION
+The
+.ZN XtAppAddSignal
+function initiates a mechanism for handling signals within the context
+of the Intrinsics. Prior to establishing an operating system dependent 
+signal handler the application may call
+.ZN XtAppAddSignal
+and store the returned \fIid\fP in a place accessible to the signal 
+handler.
+.LP
+Upon receipt of a signal from the operating system, the application may 
+call 
+.ZN XtNoticeSignal
+passing the \fIid\fP returned by the call to
+.ZN XtAppAddSignal .
+.LP
+.ZN XtNoticeSignal
+is the only Intrinsics function that can safely be called from a signal
+handler. If
+.ZN XtNoticeSignal
+is called multiple times before the Intrinsics are able to invoke the
+registered callback, the callback is only called once. Logically the
+Intrinsics maintain ``pending'' for each registered callback. This
+flag is initially
+.ZN False
+and is set to
+.ZN True 
+by
+.ZN XtNoticeSignal ;
+the Intrinsics invoke the callback whenever the flag is
+.ZN True ,
+and the flag is set to
+.ZN False
+just before the callback is invoked.
+.LP
+The
+.ZN XtRemoveSignal
+function is called to remove the specified Intrinsics signal handler. The 
+client should disable the source of the signal before calling
+.ZN XtRemoveSignal .
+.SH "SEE ALSO"
+XtAppAddTimeOut(3Xt),XtAppAddInput(3Xt),XtAppAddWorkProc(3Xt)
+.br
+\fI\*(xT\fP
+.br
+\fI\*(xL\fP