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"
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COPYRIGHT (c) 1989-93 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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NonPositionableExternalStream subclass:#PipeStream
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instanceVariableNames:''
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2
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classVariableNames:'PipeSignal'
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1
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poolDictionaries:''
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category:'Streams-External'
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!
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PipeStream comment:'
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COPYRIGHT (c) 1989-93 by Claus Gittinger
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All Rights Reserved
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%W% %E%
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'!
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%{
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#include <stdio.h>
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#ifndef transputer
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# include <sys/types.h>
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# include <sys/stat.h>
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#endif
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%}
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2
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!PipeStream class methodsFor:'documentation'!
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documentation
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"
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Pipestreams allow reading or writing from/to a unix command.
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For example, to get a stream reading the output of an 'ls -l'
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command, a PipeStream can be created with:
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PipeStream readingFrom:'ls -l'
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the characters of the commands output can be read using the
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standard stream messages as next, nextLine etc.
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If a writing pipeStream is written to, after the command has finished,
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UNIX will generate an error-signal (SIGPIPE), which will raise a
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PipeSignal. Thus, to handle this condition correctly, the following
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code is suggested:
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p := PipeStream writingTo:' ... '.
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PipeString pipeSignal handle:[:ex |
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....
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any cleanup action
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] do:[
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p nextPutLine:' ... '
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]
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"
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! !
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!PipeStream class methodsFor:'initialization'!
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initialize
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"setup the signal"
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PipeSignal := (Signal new) mayProceed:true.
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PipeSignal notifierString:'write on a pipe with no one to read'.
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! !
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!PipeStream class methodsFor:'signal access'!
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pipeSignal
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"return the signal used to handle SIGPIPE unix-signals"
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^ PipeSignal
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! !
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1
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!PipeStream class methodsFor:'instance creation'!
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writingTo:commandString
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"create and return a new pipeStream which can write to the unix command
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given by command."
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^ (self basicNew) writingTo:commandString
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1
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"PipeStream writingTo:'sort'"
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!
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readingFrom:commandString
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"create and return a new pipeStream which can read from the unix command
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given by command."
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^ (self basicNew) readingFrom:commandString
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1
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2
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"PipeStream readingFrom:'ls -l'"
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1
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! !
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!PipeStream methodsFor:'instance release'!
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closeFile
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"low level close - redefined since we close a pipe here"
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%{ /* NOCONTEXT */
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#ifndef transputer
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pclose(MKFD(_INST(filePointer)));
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#endif
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%}
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! !
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!PipeStream methodsFor:'private'!
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openPipeFor:commandString withMode:mode
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"open a pipe to commandString; mode may be 'r' or 'w'"
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|retVal|
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unBuffered := true.
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%{
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#ifndef transputer
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{
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FILE *f;
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extern OBJ ErrorNumber;
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extern errno;
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2
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extern int _immediateInterrupt;
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1
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if (_isString(commandString) && _isString(mode)) {
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2
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_immediateInterrupt = 1;
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1
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f = (FILE *)popen((char *) _stringVal(commandString),
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2
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(char *) _stringVal(mode));
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_immediateInterrupt = 0;
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1
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if (f == NULL) {
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ErrorNumber = _MKSMALLINT(errno);
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} else {
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_INST(filePointer) = MKOBJ(f);
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retVal = self;
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}
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}
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}
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#endif
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%}
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.
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retVal notNil ifTrue:[
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lobby register:self
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].
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^ retVal
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!
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readingFrom:command
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"setup the receiver to read from command"
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self readonly.
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^ self openPipeFor:command withMode:'r'
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!
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writingTo:command
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"setup the receiver to write to command"
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self writeonly.
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^ self openPipeFor:command withMode:'w'
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! !
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!PipeStream methodsFor:'redefined basic'!
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size
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"redefined since pipes have no size"
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^ self shouldNotImplement
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!
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position:newpos
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"redefined since pipes cannot be positioned"
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^ self shouldNotImplement
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!
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position
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"redefined since pipes have no position"
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^ self shouldNotImplement
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! !
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