/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018, 2019, 2020
* Jonathan Schleifer <js@nil.im>
*
* 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 <string.h>
#include <sys/time.h>
#import "OFSelectKernelEventObserver.h"
#import "OFArray.h"
#import "OFInitializationFailedException.h"
#import "OFObserveFailedException.h"
#import "OFOutOfRangeException.h"
#import "socket_helpers.h"
#ifdef OF_AMIGAOS
# include <proto/exec.h>
#endif
@implementation OFSelectKernelEventObserver
- (instancetype)init
{
self = [super init];
@try {
#ifdef OF_AMIGAOS
_maxFD = 0;
#else
# ifndef OF_WINDOWS
if (_cancelFD[0] >= (int)FD_SETSIZE)
@throw [OFInitializationFailedException
exceptionWithClass: self.class];
# endif
FD_ZERO(&_readFDs);
FD_ZERO(&_writeFDs);
FD_SET(_cancelFD[0], &_readFDs);
if (_cancelFD[0] > INT_MAX)
@throw [OFOutOfRangeException exception];
_maxFD = (int)_cancelFD[0];
#endif
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)addObjectForReading: (id <OFReadyForReadingObserving>)object
{
int fd = object.fileDescriptorForReading;
if (fd < 0)
@throw [OFObserveFailedException exceptionWithObserver: self
errNo: EBADF];
if (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);
[super addObjectForReading: object];
}
- (void)addObjectForWriting: (id <OFReadyForWritingObserving>)object
{
int fd = object.fileDescriptorForWriting;
if (fd < 0)
@throw [OFObserveFailedException exceptionWithObserver: self
errNo: EBADF];
if (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);
[super addObjectForWriting: object];
}
- (void)removeObjectForReading: (id <OFReadyForReadingObserving>)object
{
/* TODO: Adjust _maxFD */
int fd = object.fileDescriptorForReading;
if (fd < 0)
@throw [OFObserveFailedException exceptionWithObserver: self
errNo: EBADF];
#ifndef OF_WINDOWS
if (fd >= (int)FD_SETSIZE)
@throw [OFOutOfRangeException exception];
#endif
FD_CLR((of_socket_t)fd, &_readFDs);
[super removeObjectForReading: object];
}
- (void)removeObjectForWriting: (id <OFReadyForWritingObserving>)object
{
/* TODO: Adjust _maxFD */
int fd = object.fileDescriptorForWriting;
if (fd < 0)
@throw [OFObserveFailedException exceptionWithObserver: self
errNo: EBADF];
#ifndef OF_WINDOWS
if (fd >= (int)FD_SETSIZE)
@throw [OFOutOfRangeException exception];
#endif
FD_CLR((of_socket_t)fd, &_writeFDs);
[super removeObjectForWriting: object];
}
- (void)observeForTimeInterval: (of_time_interval_t)timeInterval
{
id const *objects;
fd_set readFDs;
fd_set writeFDs;
struct timeval timeout;
int events;
#ifdef OF_AMIGAOS
ULONG execSignalMask, cancelSignal;
#endif
size_t count;
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)((timeInterval - timeout.tv_sec) * 1000);
#ifdef OF_AMIGAOS
if ((cancelSignal = AllocSignal(-1)) == (ULONG)-1)
@throw [OFObserveFailedException exceptionWithObserver: self
errNo: EAGAIN];
execSignalMask = _execSignalMask | (1ul << cancelSignal);
Forbid();
_waitingTask = FindTask(NULL);
_cancelSignal = cancelSignal;
events = WaitSelect(_maxFD + 1, &readFDs, &writeFDs, NULL,
(void *)(timeInterval != -1 ? &timeout : NULL), &execSignalMask);
execSignalMask &= ~(1ul << cancelSignal);
_waitingTask = NULL;
FreeSignal(_cancelSignal);
Permit();
#else
events = select(_maxFD + 1, &readFDs, &writeFDs, NULL,
(timeInterval != -1 ? &timeout : NULL));
#endif
if (events < 0)
@throw [OFObserveFailedException
exceptionWithObserver: self
errNo: of_socket_errno()];
#ifdef OF_AMIGAOS
if (execSignalMask != 0 &&
[_delegate respondsToSelector: @selector(execSignalWasReceived:)])
[_delegate execSignalWasReceived: execSignalMask];
#else
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], (void *)&buffer, 1, 0, NULL,
NULL) == 1);
# endif
}
#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