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/** Implementation for NSPipe for GNUStep
Copyright (C) 1997 Free Software Foundation, Inc.
Written by: Richard Frith-Macdonald <richard@brainstorm.co.uk>
Date: 1997
This file is part of the GNUstep Base Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110 USA.
$Date$ $Revision$
*/
#import "common.h"
#define EXPOSE_NSPipe_IVARS 1
#import "Foundation/NSFileHandle.h"
#import "GSPrivate.h"
/**
* <p>The NSPipe provides an encapsulation of the UNIX concept of pipe.<br />
* With NSPipe, it is possible to redirect the standard input or
* standard output.
* </p>
* <p>The file handles created by NSPipe are automatically closed when they
* are no longer in use (ie when the NSPipe instance is deallocated), so you
* don't need to close them explicitly.
* </p>
*/
@implementation NSPipe
/**
* Returns a newly allocated and initialized NSPipe object that has been
* sent an autorelease message.
*/
+ (id) pipe
{
return AUTORELEASE([[self alloc] init]);
}
- (void) dealloc
{
RELEASE(_readHandle);
RELEASE(_writeHandle);
[super dealloc];
}
- (id) init
{
self = [super init];
if (self != nil)
{
#ifndef _WIN32
int p[2];
if (pipe(p) == 0)
{
_readHandle = [[NSFileHandle alloc] initWithFileDescriptor: p[0]
closeOnDealloc: YES];
_writeHandle = [[NSFileHandle alloc] initWithFileDescriptor: p[1]
closeOnDealloc: YES];
}
else
{
NSLog(@"Failed to create pipe ... %@", [NSError _last]);
DESTROY(self);
}
#else
SECURITY_ATTRIBUTES saAttr;
HANDLE readh, writeh;
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
saAttr.bInheritHandle = FALSE;
saAttr.lpSecurityDescriptor = NULL;
if (CreatePipe(&readh, &writeh, &saAttr, 0) != 0)
{
_readHandle = [[NSFileHandle alloc] initWithNativeHandle: readh
closeOnDealloc: YES];
_writeHandle = [[NSFileHandle alloc] initWithNativeHandle: writeh
closeOnDealloc: YES];
}
else
{
NSLog(@"Failed to create pipe ... %@", [NSError _last]);
DESTROY(self);
}
#endif
}
return self;
}
/**
* Returns the file handle for reading from the pipe.
*/
- (NSFileHandle*) fileHandleForReading
{
return _readHandle;
}
/**
* Returns the file handle for writing to the pipe.
*/
- (NSFileHandle*) fileHandleForWriting
{
return _writeHandle;
}
@end
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