/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
* Jonathan Schleifer <js@heap.zone>
*
* 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 "platform.h"
#ifdef OF_WINDOWS
/* Win32 has a ridiculous default of 64, even though it supports much more. */
# define FD_SETSIZE 1024
#endif
#include <errno.h>
#include <math.h>
#include <string.h>
#include <sys/time.h>
#import "OFKernelEventObserver.h"
#import "OFKernelEventObserver+Private.h"
#import "OFKernelEventObserver_select.h"
#import "OFArray.h"
#import "OFInitializationFailedException.h"
#import "OFObserveFailedException.h"
#import "OFOutOfRangeException.h"
#import "socket_helpers.h"
@implementation OFKernelEventObserver_select
- init
{
self = [super init];
#ifndef OF_WINDOWS
if (_cancelFD[0] >= (int)FD_SETSIZE)
@throw [OFInitializationFailedException exception];
#endif
FD_ZERO(&_readFDs);
FD_ZERO(&_writeFDs);
FD_SET(_cancelFD[0], &_readFDs);
if (_cancelFD[0] > INT_MAX)
@throw [OFOutOfRangeException exception];
_maxFD = (int)_cancelFD[0];
return self;
}
- (void)OF_addObjectForReading: (id <OFReadyForReadingObserving>)object
{
int fd = [object fileDescriptorForReading];
if (fd < 0 || fd > INT_MAX - 1)
@throw [OFOutOfRangeException exception];
#ifndef OF_WINDOWS
if (fd >= (int)FD_SETSIZE)
@throw [OFOutOfRangeException exception];
#endif
if (fd > _maxFD)
_maxFD = fd;
FD_SET((of_socket_t)fd, &_readFDs);
}
- (void)OF_addObjectForWriting: (id <OFReadyForWritingObserving>)object
{
int fd = [object fileDescriptorForWriting];
if (fd < 0 || fd > INT_MAX - 1)
@throw [OFOutOfRangeException exception];
#ifndef OF_WINDOWS
if (fd >= (int)FD_SETSIZE)
@throw [OFOutOfRangeException exception];
#endif
if (fd > _maxFD)
_maxFD = fd;
FD_SET((of_socket_t)fd, &_writeFDs);
}
- (void)OF_removeObjectForReading: (id <OFReadyForReadingObserving>)object
{
/* TODO: Adjust _maxFD */
int fd = [object fileDescriptorForReading];
if (fd < 0)
@throw [OFOutOfRangeException exception];
#ifndef OF_WINDOWS
if (fd >= (int)FD_SETSIZE)
@throw [OFOutOfRangeException exception];
#endif
FD_CLR((of_socket_t)fd, &_readFDs);
}
- (void)OF_removeObjectForWriting: (id <OFReadyForWritingObserving>)object
{
/* TODO: Adjust _maxFD */
int fd = [object fileDescriptorForWriting];
if (fd < 0)
@throw [OFOutOfRangeException exception];
#ifndef OF_WINDOWS
if (fd >= (int)FD_SETSIZE)
@throw [OFOutOfRangeException exception];
#endif
FD_CLR((of_socket_t)fd, &_writeFDs);
}
- (void)observeForTimeInterval: (of_time_interval_t)timeInterval
{
id const *objects;
fd_set readFDs;
fd_set writeFDs;
struct timeval timeout;
int events;
size_t count;
[self OF_processQueue];
if ([self OF_processReadBuffers])
return;
#ifdef FD_COPY
FD_COPY(&_readFDs, &readFDs);
FD_COPY(&_writeFDs, &writeFDs);
#else
readFDs = _readFDs;
writeFDs = _writeFDs;
#endif
/*
* We cast to int before assigning to tv_usec in order to avoid a
* warning with Apple GCC on PowerPC. POSIX defines this as suseconds_t,
* however, this is not available on Win32. As an int should always
* satisfy the required range, we just cast to int.
*/
#ifndef OF_WINDOWS
timeout.tv_sec = (time_t)timeInterval;
#else
timeout.tv_sec = (long)timeInterval;
#endif
timeout.tv_usec = (int)lrint((timeInterval - timeout.tv_sec) * 1000);
events = select(_maxFD + 1, &readFDs, &writeFDs, NULL,
(timeInterval != -1 ? &timeout : NULL));
if (events < 0)
@throw [OFObserveFailedException exceptionWithObserver: self
errNo: errno];
if (FD_ISSET(_cancelFD[0], &readFDs)) {
char buffer;
#ifdef OF_HAVE_PIPE
OF_ENSURE(read(_cancelFD[0], &buffer, 1) == 1);
#else
OF_ENSURE(recvfrom(_cancelFD[0], &buffer, 1, 0, NULL,
NULL) == 1);
#endif
}
objects = [_readObjects objects];
count = [_readObjects count];
for (size_t i = 0; i < count; i++) {
void *pool = objc_autoreleasePoolPush();
int fd = [objects[i] fileDescriptorForReading];
if (FD_ISSET((of_socket_t)fd, &readFDs) &&
[_delegate respondsToSelector:
@selector(objectIsReadyForReading:)])
[_delegate objectIsReadyForReading: objects[i]];
objc_autoreleasePoolPop(pool);
}
objects = [_writeObjects objects];
count = [_writeObjects count];
for (size_t i = 0; i < count; i++) {
void *pool = objc_autoreleasePoolPush();
int fd = [objects[i] fileDescriptorForWriting];
if (FD_ISSET((of_socket_t)fd, &writeFDs) &&
[_delegate respondsToSelector:
@selector(objectIsReadyForWriting:)])
[_delegate objectIsReadyForWriting: objects[i]];
objc_autoreleasePoolPop(pool);
}
}
@end