author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Wed, 31 Mar 2010 11:11:55 +0100 | |
changeset 7 | 51a74ef9ed63 |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-E65D91AE-482F-5592-B83C-0F29126C2EFA" xml:lang="en"><title>Using |
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Signals to Handle Exceptions </title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>Signals provide an alternative method (to checking return values) of handling |
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exceptions or failures. The following example code demonstrates how you can |
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check the return value for a failure and also how you can register a handler |
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for handling the failure asynchronously: </p> |
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<codeblock id="GUID-49B4A39A-34F5-54D1-AD97-5AD50EFD9786" xml:space="preserve">#include <signal.h> |
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#include <stdio.h> |
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int func() |
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{ |
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int success = 1; |
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// function logic |
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// success == 1 - Indicates that the function logic succeeded |
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// success == 0 - Indicates that the function logic failed |
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if(success) |
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return 0; |
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else |
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{ |
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raise(SIGUSR1); |
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return -1; |
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} |
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} |
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void sighandler(int signum) |
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{ |
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if(signum == SIGUSR1) |
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// 'signal' method for checking failure |
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printf(“Error: An error occured in func().”); |
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else |
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printf(“Error: Unknown signal”); |
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} |
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int main(void) |
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{ |
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int retval = 0; |
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// When SIGUSR1 arrives, invoke sighandler() |
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signal(SIGUSR1,sighandler); |
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retval = func(); |
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if(retval == -1) |
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// The return value method used for checking failure |
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printf("Error: An error occured in func()."); |
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}</codeblock> |
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</conbody><related-links> |
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<link href="GUID-66C1493D-5B85-558A-9A39-454E6EBA307B.dita"><linktext>Signal Emulation |
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on the Symbian Platform</linktext></link> |
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<link href="GUID-186B9876-2A08-5F23-BB49-49EC34C51507.dita"><linktext>Using Signals |
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to Terminate Processes</linktext></link> |
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<link href="GUID-6CF8A41B-C2DD-5D57-A71D-6405CE08A06B.dita"><linktext>Using Signals |
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to Handle Asynchronous Events</linktext></link> |
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</related-links></concept> |