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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012
* Jonathan Schleifer <js@webkeks.org>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "config.h"
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#import "OFStreamObserver_kqueue.h"
#import "OFDataArray.h"
#import "OFInitializationFailedException.h"
#import "OFOutOfMemoryException.h"
#import "autorelease.h"
#import "macros.h"
#define EVENTLIST_SIZE 64
@implementation OFStreamObserver_kqueue
- init
{
self = [super init];
@try {
if ((kernelQueue = kqueue()) == -1)
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
changeList = [[OFDataArray alloc] initWithItemSize:
sizeof(struct kevent)];
[self _addFileDescriptorForReading: cancelFD[0]];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
close(kernelQueue);
[changeList release];
[super dealloc];
}
- (void)_addFileDescriptorForReading: (int)fd
{
struct kevent event;
EV_SET(&event, fd, EVFILT_READ, EV_ADD, 0, 0, 0);
[changeList addItem: &event];
}
- (void)_addFileDescriptorForWriting: (int)fd
{
struct kevent event;
EV_SET(&event, fd, EVFILT_WRITE, EV_ADD, 0, 0, 0);
[changeList addItem: &event];
}
- (void)_removeFileDescriptorForReading: (int)fd
{
struct kevent event;
EV_SET(&event, fd, EVFILT_READ, EV_DELETE, 0, 0, 0);
[changeList addItem: &event];
}
- (void)_removeFileDescriptorForWriting: (int)fd
{
struct kevent event;
EV_SET(&event, fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0);
[changeList addItem: &event];
}
- (BOOL)observeWithTimeout: (int)timeout
{
void *pool = objc_autoreleasePoolPush();
struct timespec timespec = { timeout, 0 };
struct kevent eventList[EVENTLIST_SIZE];
int i, events;
[self _processQueue];
if ([self _processCache]) {
objc_autoreleasePoolPop(pool);
return YES;
}
objc_autoreleasePoolPop(pool);
events = kevent(kernelQueue, [changeList cArray],
(int)[changeList count], eventList, EVENTLIST_SIZE,
(timeout == -1 ? NULL : &timespec));
if (events == -1) {
switch (errno) {
case EINTR:
return NO;
case ENOMEM:
@throw [OFOutOfMemoryException
exceptionWithClass: [self class]];
default:
assert(0);
}
}
[changeList removeAllItems];
if (events == 0)
return NO;
for (i = 0; i < events; i++) {
if (eventList[i].ident == cancelFD[0]) {
char buffer;
OF_ENSURE(read(cancelFD[0], &buffer, 1) > 0);
continue;
}
pool = objc_autoreleasePoolPush();
if (eventList[i].flags & EV_ERROR) {
[delegate streamDidReceiveException:
FDToStream[eventList[i].ident]];
objc_autoreleasePoolPop(pool);
continue;
}
switch (eventList[i].filter) {
case EVFILT_READ:
[delegate streamIsReadyForReading:
FDToStream[eventList[i].ident]];
break;
case EVFILT_WRITE:
[delegate streamIsReadyForWriting:
FDToStream[eventList[i].ident]];
break;
default:
assert(0);
}
objc_autoreleasePoolPop(pool);
}
return YES;
}
@end
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