author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Fri, 11 Jun 2010 15:24:34 +0100 | |
changeset 9 | 59758314f811 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
0
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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<?xml version="1.0" encoding="utf-8"?> |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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<!-- This component and the accompanying materials are made available under the terms of the License |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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"Eclipse Public License v1.0" which accompanies this distribution, |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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--> |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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<!DOCTYPE concept |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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<concept id="GUID-383C128C-15EB-4C64-9A1F-F1EA826323D0" xml:lang="en"><title>Parent |
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and Child IPC Using Named Pipes or FIFOs</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>An alternative approach to using the <xref href="GUID-A9DB6E7C-B8D6-377A-BBE6-39E0A7A09E5D.dita"><apiname>popen()</apiname></xref> function |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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is to use named pipes, or FIFOs. The advantage of using them over the <xref href="GUID-A9DB6E7C-B8D6-377A-BBE6-39E0A7A09E5D.dita"><apiname>popen()</apiname></xref> mechanism |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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is that they allow the code in both the parent and child processes to continue |
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to use file descriptors for communication rather than streams (and avoid modification |
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to the<codeph> stdin()</codeph>/<codeph>stdout()</codeph> streams of the child |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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process). </p> |
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<p>In addition, since each created FIFO is referenced as a file in the file |
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system, FIFOs allow for more complicated IPC schemes than those offered by |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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the <xref href="GUID-A9DB6E7C-B8D6-377A-BBE6-39E0A7A09E5D.dita"><apiname>popen()</apiname></xref> function, for example, inter-child process |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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communication. For more information about the use of FIFOs, see <xref href="http://www.opengroup.org" scope="external">http:\\www.opengroup.org</xref>. </p> |
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<p><b>Parent process P.I.P.S. example using FIFOs</b></p> |
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<p>The following code shows how FIFOs can be used in P.I.P.S. by the parent |
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process.</p> |
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<codeblock xml:space="preserve">int main(int argc, char *argv[]) |
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{ |
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char fifoFileName[] = "/root/PortDoc/Example2_c/Symbian/fifofile"; |
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int fifoResult = mkfifo(fifoFileName,S_IXGRP); |
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if(fifoResult == -1) |
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{ |
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//FIFO creation failure. |
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printf("\n*** failure mkfifo ***\n"); |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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return EXIT_FAILURE; |
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} |
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else |
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{ |
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//FIFO creation successful. |
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//Spawn the child process. |
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pid_t Childpid; |
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char execFileName[] = "/root/PortDoc/Example2_c/Symbian/ChildProg"; |
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int RetVal= posix_spawn(&Childpid,execFileName,NULL,NULL,NULL,NULL); |
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if(RetVal != 0) |
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{ |
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printf("\n*** failure posix_spawn ***\n"); |
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return EXIT_FAILURE; |
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} |
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else |
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{ |
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//Open the FIFO. Parent reads from the FIFO |
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int ReadFifoFd = open(fifoFileName,O_RDONLY); |
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|
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if(ReadFifoFd == -1) |
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{ |
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//Failed to open the Fifo |
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printf("\n*** failure Fifo Open ***\n"); |
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return EXIT_FAILURE; |
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} |
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else |
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{ |
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//create a receive buffer and clear |
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char RxBuffer[100]; |
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memset(RxBuffer,0,sizeof(RxBuffer)); |
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//Wait for data from the child process. Child sends a string. |
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int nbytes = read(ReadFifoFd,RxBuffer,sizeof(RxBuffer)); |
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printf("\nMessage Received by Parent=%s",RxBuffer); |
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//close the FIFO |
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(void)close(ReadFifoFd); |
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} |
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//wait for the child process to finish |
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(void)waitpid(Childpid,NULL,0); |
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//unlink the FIFO |
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unlink(fifoFileName); |
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} |
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} |
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return EXIT_SUCCESS; |
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} |
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</codeblock> |
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<p><b>Child process P.I.P.S. example using FIFOs</b></p> |
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<p>The following code shows how FIFOs can be used in P.I.P.S. by the child |
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process. </p> |
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<codeblock xml:space="preserve">int main(int argc, char *argv[]) |
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{ |
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char fifoFileName[] = "/root/PortDoc/Example2_c/Symbian/fifofile"; |
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//Open the FIFO. child writes to parent |
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int WriteFifoFd = open(fifoFileName,O_WRONLY); |
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if(WriteFifoFd == -1) |
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{ |
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//Failed to open the Fifo |
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printf("\n*** child failure Fifo Open ***\n"); |
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return EXIT_FAILURE; |
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} |
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else |
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{ |
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//create a message to send. |
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char TxMsg[] = "Hello Parent\n"; |
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|
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//Wait for data from the child process. Child sends a string. |
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write(WriteFifoFd,TxMsg,sizeof(TxMsg)); |
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//close the FIFO |
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(void)close(WriteFifoFd); |
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} |
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return EXIT_SUCCESS; |
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} |
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</codeblock> |
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</conbody></concept> |