/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014
* 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.
*/
#define __NO_EXT_QNX
#include "config.h"
#include <assert.h>
#import "OFKernelEventObserver.h"
#import "OFKernelEventObserver+Private.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFStream.h"
#import "OFStream+Private.h"
#import "OFDataArray.h"
#ifndef OF_HAVE_PIPE
# import "OFStreamSocket.h"
#endif
#ifdef OF_HAVE_THREADS
# import "OFMutex.h"
#endif
#import "OFDate.h"
#ifdef HAVE_KQUEUE
# import "OFKernelEventObserver_kqueue.h"
#endif
#if defined(HAVE_POLL_H) || defined(__wii__)
# import "OFKernelEventObserver_poll.h"
#endif
#if defined(HAVE_SYS_SELECT_H) || defined(_WIN32)
# import "OFKernelEventObserver_select.h"
#endif
#import "OFInitializationFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFOutOfRangeException.h"
#import "autorelease.h"
#import "macros.h"
#import "socket_helpers.h"
enum {
QUEUE_ADD = 0,
QUEUE_REMOVE = 1,
QUEUE_READ = 0,
QUEUE_WRITE = 2
};
#define QUEUE_ACTION (QUEUE_ADD | QUEUE_REMOVE)
@implementation OFKernelEventObserver
+ (void)initialize
{
if (self != [OFKernelEventObserver class])
return;
if (!of_init_sockets())
@throw [OFInitializationFailedException
exceptionWithClass: self];
}
+ (instancetype)observer
{
return [[[self alloc] init] autorelease];
}
#if defined(HAVE_KQUEUE)
+ alloc
{
if (self == [OFKernelEventObserver class])
return [OFKernelEventObserver_kqueue alloc];
return [super alloc];
}
#elif defined(HAVE_POLL_H) || defined(__wii__)
+ alloc
{
if (self == [OFKernelEventObserver class])
return [OFKernelEventObserver_poll alloc];
return [super alloc];
}
#elif defined(HAVE_SYS_SELECT_H) || defined(_WIN32)
+ alloc
{
if (self == [OFKernelEventObserver class])
return [OFKernelEventObserver_select alloc];
return [super alloc];
}
#endif
- init
{
self = [super init];
@try {
#if !defined(OF_HAVE_PIPE) && !defined(__wii__)
socklen_t cancelAddrLen;
#endif
_readObjects = [[OFMutableArray alloc] init];
_writeObjects = [[OFMutableArray alloc] init];
_queue = [[OFMutableArray alloc] init];
_queueInfo = [[OFDataArray alloc]
initWithItemSize: sizeof(int)];
_queueFDs = [[OFDataArray alloc] initWithItemSize: sizeof(int)];
#ifdef OF_HAVE_PIPE
if (pipe(_cancelFD))
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
#else
_cancelFD[0] = _cancelFD[1] = socket(AF_INET, SOCK_DGRAM, 0);
if (_cancelFD[0] == INVALID_SOCKET)
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
_cancelAddr.sin_family = AF_INET;
_cancelAddr.sin_port = 0;
_cancelAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
# ifdef __wii__
/* The Wii does not accept port 0 as "choose any free port" */
_cancelAddr.sin_port = 65535;
# endif
if (bind(_cancelFD[0], (struct sockaddr*)&_cancelAddr,
sizeof(_cancelAddr)))
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
# ifndef __wii__
cancelAddrLen = sizeof(_cancelAddr);
if (getsockname(_cancelFD[0], (struct sockaddr*)&_cancelAddr,
&cancelAddrLen))
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
# endif
#endif
_maxFD = _cancelFD[0];
_FDToObject = [self allocMemoryWithSize: sizeof(id)
count: _maxFD + 1];
_FDToObject[_cancelFD[0]] = nil;
#ifdef OF_HAVE_THREADS
_mutex = [[OFMutex alloc] init];
#endif
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
close(_cancelFD[0]);
if (_cancelFD[1] != _cancelFD[0])
close(_cancelFD[1]);
[_readObjects release];
[_writeObjects release];
[_queue release];
[_queueInfo release];
[_queueFDs release];
#ifdef OF_HAVE_THREADS
[_mutex release];
#endif
[super dealloc];
}
- (id <OFKernelEventObserverDelegate>)delegate
{
return _delegate;
}
- (void)setDelegate: (id <OFKernelEventObserverDelegate>)delegate
{
_delegate = delegate;
}
- (void)addObjectForReading: (id <OFReadyForReadingObserving>)object
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
int qi = QUEUE_ADD | QUEUE_READ;
int fd = [object fileDescriptorForReading];
[_queue addObject: object];
[_queueInfo addItem: &qi];
[_queueFDs addItem: &fd];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
[self cancel];
}
- (void)addObjectForWriting: (id <OFReadyForWritingObserving>)object
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
int qi = QUEUE_ADD | QUEUE_WRITE;
int fd = [object fileDescriptorForWriting];
[_queue addObject: object];
[_queueInfo addItem: &qi];
[_queueFDs addItem: &fd];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
[self cancel];
}
- (void)removeObjectForReading: (id <OFReadyForReadingObserving>)object
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
int qi = QUEUE_REMOVE | QUEUE_READ;
int fd = [object fileDescriptorForReading];
[_queue addObject: object];
[_queueInfo addItem: &qi];
[_queueFDs addItem: &fd];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
[self cancel];
}
- (void)removeObjectForWriting: (id <OFReadyForWritingObserving>)object
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
int qi = QUEUE_REMOVE | QUEUE_WRITE;
int fd = [object fileDescriptorForWriting];
[_queue addObject: object];
[_queueInfo addItem: &qi];
[_queueFDs addItem: &fd];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
[self cancel];
}
- (void)OF_addFileDescriptorForReading: (int)fd
{
OF_UNRECOGNIZED_SELECTOR
}
- (void)OF_addFileDescriptorForWriting: (int)fd
{
OF_UNRECOGNIZED_SELECTOR
}
- (void)OF_removeFileDescriptorForReading: (int)fd
{
OF_UNRECOGNIZED_SELECTOR
}
- (void)OF_removeFileDescriptorForWriting: (int)fd
{
OF_UNRECOGNIZED_SELECTOR
}
- (void)OF_processQueue
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
id *queueObjects = [_queue objects];
int *queueInfoItems = [_queueInfo items];
int *queueFDsItems = [_queueFDs items];
size_t i, count = [_queue count];
for (i = 0; i < count; i++) {
id object = queueObjects[i];
int action = queueInfoItems[i];
int fd = queueFDsItems[i];
if ((action & QUEUE_ACTION) == QUEUE_ADD) {
if (fd > _maxFD) {
_maxFD = fd;
_FDToObject = [self
resizeMemory: _FDToObject
size: sizeof(id)
count: _maxFD + 1];
}
_FDToObject[fd] = object;
}
if ((action & QUEUE_ACTION) == QUEUE_REMOVE) {
/* FIXME: Maybe downsize? */
_FDToObject[fd] = nil;
}
switch (action) {
case QUEUE_ADD | QUEUE_READ:
[_readObjects addObject: object];
[self OF_addFileDescriptorForReading: fd];
break;
case QUEUE_ADD | QUEUE_WRITE:
[_writeObjects addObject: object];
[self OF_addFileDescriptorForWriting: fd];
break;
case QUEUE_REMOVE | QUEUE_READ:
[self OF_removeFileDescriptorForReading: fd];
[_readObjects removeObjectIdenticalTo: object];
break;
case QUEUE_REMOVE | QUEUE_WRITE:
[self OF_removeFileDescriptorForWriting: fd];
[_writeObjects removeObjectIdenticalTo: object];
break;
default:
assert(0);
}
}
[_queue removeAllObjects];
[_queueInfo removeAllItems];
[_queueFDs removeAllItems];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
}
- (void)observe
{
[self observeForTimeInterval: -1];
}
- (bool)observeForTimeInterval: (of_time_interval_t)timeInterval
{
OF_UNRECOGNIZED_SELECTOR
}
- (bool)observeUntilDate: (OFDate*)date
{
return [self observeForTimeInterval: [date timeIntervalSinceNow]];
}
- (void)cancel
{
#ifdef OF_HAVE_PIPE
OF_ENSURE(write(_cancelFD[1], "", 1) > 0);
#else
OF_ENSURE(sendto(_cancelFD[1], "", 1, 0, (struct sockaddr*)&_cancelAddr,
sizeof(_cancelAddr)) > 0);
#endif
}
- (bool)OF_processCache
{
id *objects = [_readObjects objects];
size_t i, count = [_readObjects count];
bool foundInCache = false;
for (i = 0; i < count; i++) {
if ([objects[i] isKindOfClass: [OFStream class]] &&
[objects[i] numberOfBytesInReadBuffer] > 0 &&
![objects[i] OF_isWaitingForDelimiter]) {
void *pool = objc_autoreleasePoolPush();
if ([_delegate respondsToSelector:
@selector(objectIsReadyForReading:)])
[_delegate objectIsReadyForReading: objects[i]];
foundInCache = true;
objc_autoreleasePoolPop(pool);
}
}
/*
* As long as we have data in the cache for any stream, we don't want
* to block.
*/
if (foundInCache)
return true;
return false;
}
@end