/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
* 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 <assert.h>
#include <errno.h>
#include <math.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#import "OFKernelEventObserver.h"
#import "OFKernelEventObserver+Private.h"
#import "OFKernelEventObserver_kqueue.h"
#import "OFDataArray.h"
#import "OFArray.h"
#import "OFInitializationFailedException.h"
#import "OFObserveFailedException.h"
#import "OFOutOfRangeException.h"
#define EVENTLIST_SIZE 64
@implementation OFKernelEventObserver_kqueue
- init
{
self = [super init];
@try {
#ifdef HAVE_KQUEUE1
if ((_kernelQueue = kqueue1(O_CLOEXEC)) == -1)
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
#else
int flags;
if ((_kernelQueue = kqueue()) == -1)
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
if ((flags = fcntl(_kernelQueue, F_GETFD, 0)) != -1)
fcntl(_kernelQueue, F_SETFD, flags | FD_CLOEXEC);
#endif
_changeList = [[OFDataArray alloc] initWithItemSize:
sizeof(struct kevent)];
_removedArray = [[OFMutableArray alloc] init];
[self OF_addFileDescriptorForReading: _cancelFD[0]];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
close(_kernelQueue);
[_changeList release];
[_removedArray release];
[super dealloc];
}
- (void)OF_addFileDescriptorForReading: (int)fd
{
struct kevent event;
if ([_changeList count] >= INT_MAX)
@throw [OFOutOfRangeException exception];
EV_SET(&event, fd, EVFILT_READ, EV_ADD, 0, 0, 0);
[_changeList addItem: &event];
}
- (void)OF_addFileDescriptorForWriting: (int)fd
{
struct kevent event;
if ([_changeList count] >= INT_MAX)
@throw [OFOutOfRangeException exception];
EV_SET(&event, fd, EVFILT_WRITE, EV_ADD, 0, 0, 0);
[_changeList addItem: &event];
}
- (void)OF_removeFileDescriptorForReading: (int)fd
{
struct kevent event;
EV_SET(&event, fd, EVFILT_READ, EV_DELETE, 0, 0, 0);
[_changeList addItem: &event];
}
- (void)OF_removeFileDescriptorForWriting: (int)fd
{
struct kevent event;
EV_SET(&event, fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0);
[_changeList addItem: &event];
}
- (bool)observeForTimeInterval: (of_time_interval_t)timeInterval
{
void *pool = objc_autoreleasePoolPush();
struct timespec timeout;
struct kevent eventList[EVENTLIST_SIZE];
int i, events, realEvents = 0;
timeout.tv_sec = (time_t)timeInterval;
timeout.tv_nsec = lrint((timeInterval - timeout.tv_sec) * 1000000000);
/*
* Make sure to keep the streams retained and thus the file descriptors
* valid until the actual change has been performed.
*/
[self OF_processQueueAndStoreRemovedIn: _removedArray];
if ([self OF_processReadBuffers]) {
objc_autoreleasePoolPop(pool);
return true;
}
objc_autoreleasePoolPop(pool);
events = kevent(_kernelQueue, [_changeList items],
(int)[_changeList count], eventList, EVENTLIST_SIZE,
(timeInterval == -1 ? NULL : &timeout));
if (events < 0)
return [OFObserveFailedException exceptionWithObserver: self
errNo: errno];
[_changeList removeAllItems];
[_removedArray removeAllObjects];
if (events == 0)
return false;
for (i = 0; i < events; i++) {
if (eventList[i].ident == _cancelFD[0]) {
char buffer;
assert(eventList[i].filter == EVFILT_READ);
OF_ENSURE(read(_cancelFD[0], &buffer, 1) == 1);
continue;
}
pool = objc_autoreleasePoolPush();
switch (eventList[i].filter) {
case EVFILT_READ:
if ([_delegate respondsToSelector:
@selector(objectIsReadyForReading:)])
[_delegate objectIsReadyForReading:
_FDToObject[eventList[i].ident]];
break;
case EVFILT_WRITE:
if ([_delegate respondsToSelector:
@selector(objectIsReadyForWriting:)])
[_delegate objectIsReadyForWriting:
_FDToObject[eventList[i].ident]];
break;
default:
assert(0);
}
objc_autoreleasePoolPop(pool);
realEvents++;
}
if (realEvents == 0)
return false;
return true;
}
@end