195 lines
4.8 KiB
Groff
195 lines
4.8 KiB
Groff
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.\" Copyright (c) 1993, 1994 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included in
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.\" all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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.\" SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall not
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.\" be used in advertising or otherwise to promote the sale, use or other
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.\" dealing in this Software without prior written authorization from the
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.\" X Consortium.
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.\"
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.ds tk X Toolkit
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xI Intrinsics
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.ds xW X Toolkit Athena Widgets \- C Language Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.ds Rn 3
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.ds Vn 2.2
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.hw XtApp-Add-Signal wid-get
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.\".if \\n(VS>=40 .vs \\n(VSu
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.de De
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.nr BD 0
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.de FD
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.\" the imagen conditional, 480,
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.\" may be changed to L if LB is too
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.\" heavy for your eyes...
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.\"
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.ie "\\*(.T"480" .ft L
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.el .ie "\\*(.T"300" .ft L
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.de C}
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..
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.ny0
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.TH XtAppAddSignal __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtAppAddSignal, XtRemoveSignal, XtNoticeSignal \- register and remove a signal source
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.SH SYNTAX
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.HP
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XtSignalId XtAppAddSignal(XtAppContext \fIapp_context\fP, XtSignalCallbackProc
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\fIproc\fP, XtPointer \fIclient_data\fP);
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.HP
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void XtRemoveSignal(XtSignalId \fIid\fP);
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.HP
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void XtNoticeSignal(XtSignalId \fIid\fP);
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.SH ARGUMENTS
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.IP \fIapp_context\fP 1i
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Specifies the application context.
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.IP \fIclient_data\fP 1i
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Specifies the argument that is to be passed to the specified procedure
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when a signal has been raised.
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.IP \fIid\fP 1i
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Specifies the ID returned from the corresponding
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.ZN XtAppAddSignal
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call.
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.IP \fIproc\fP 1i
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Specifies the procedure that is to be called when the signal has been
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raised.
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.SH DESCRIPTION
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The
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.ZN XtAppAddSignal
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function initiates a mechanism for handling signals within the context
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of the Intrinsics. Prior to establishing an operating system dependent
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signal handler the application may call
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.ZN XtAppAddSignal
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and store the returned \fIid\fP in a place accessible to the signal
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handler.
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.LP
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Upon receipt of a signal from the operating system, the application may
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call
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.ZN XtNoticeSignal
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passing the \fIid\fP returned by the call to
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.ZN XtAppAddSignal .
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.LP
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.ZN XtNoticeSignal
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is the only Intrinsics function that can safely be called from a signal
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handler. If
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.ZN XtNoticeSignal
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is called multiple times before the Intrinsics are able to invoke the
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registered callback, the callback is only called once. Logically the
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Intrinsics maintain ``pending'' for each registered callback. This
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flag is initially
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.ZN False
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and is set to
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.ZN True
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by
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.ZN XtNoticeSignal ;
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the Intrinsics invoke the callback whenever the flag is
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.ZN True ,
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and the flag is set to
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.ZN False
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just before the callback is invoked.
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.LP
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The
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.ZN XtRemoveSignal
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function is called to remove the specified Intrinsics signal handler. The
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client should disable the source of the signal before calling
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.ZN XtRemoveSignal .
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.SH "SEE ALSO"
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XtAppAddTimeOut(3Xt),XtAppAddInput(3Xt),XtAppAddWorkProc(3Xt)
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.br
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\fI\*(xT\fP
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.br
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\fI\*(xL\fP
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