353 lines
7.6 KiB
C++
353 lines
7.6 KiB
C++
/*
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* Copyright 2007, Haiku, Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Hugo Santos, hugosantos@gmail.com
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*/
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#ifndef PROTOCOL_UTILITIES_H
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#define PROTOCOL_UTILITIES_H
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#include <lock.h>
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#include <Select.h>
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#include <util/AutoLock.h>
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#include <util/DoublyLinkedList.h>
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#include <AddressUtilities.h>
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#include <net_buffer.h>
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#include <net_protocol.h>
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#include <net_socket.h>
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#include <net_stack.h>
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class MutexLocking {
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public:
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typedef mutex Type;
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typedef MutexLocker AutoLocker;
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static status_t Init(mutex *lock, const char *name)
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{ mutex_init_etc(lock, name, MUTEX_FLAG_CLONE_NAME); return B_OK; }
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static void Destroy(mutex *lock) { mutex_destroy(lock); }
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static status_t Lock(mutex *lock) { return mutex_lock(lock); }
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static status_t Unlock(mutex *lock) { mutex_unlock(lock); return B_OK; }
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};
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extern net_buffer_module_info *gBufferModule;
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extern net_stack_module_info *gStackModule;
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class NetModuleBundleGetter {
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public:
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static net_stack_module_info *Stack() { return gStackModule; }
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static net_buffer_module_info *Buffer() { return gBufferModule; }
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};
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class ProtocolSocket {
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public:
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ProtocolSocket(net_socket *socket);
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status_t Open();
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SocketAddress LocalAddress()
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{ return SocketAddress(fDomain->address_module, &fSocket->address); }
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ConstSocketAddress LocalAddress() const
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{ return ConstSocketAddress(fDomain->address_module, &fSocket->address); }
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SocketAddress PeerAddress()
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{ return SocketAddress(fDomain->address_module, &fSocket->peer); }
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ConstSocketAddress PeerAddress() const
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{ return ConstSocketAddress(fDomain->address_module, &fSocket->peer); }
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net_domain *Domain() const { return fDomain; }
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net_address_module_info *AddressModule() const
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{ return fDomain->address_module; }
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protected:
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net_socket *fSocket;
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net_domain *fDomain;
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};
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inline ProtocolSocket::ProtocolSocket(net_socket *socket)
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: fSocket(socket), fDomain(NULL) {}
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inline status_t
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ProtocolSocket::Open()
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{
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fDomain = fSocket->first_protocol->module->get_domain(
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fSocket->first_protocol);
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if (fDomain == NULL || fDomain->address_module == NULL)
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return EAFNOSUPPORT;
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return B_OK;
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}
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template<typename LockingBase = MutexLocking,
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typename ModuleBundle = NetModuleBundleGetter>
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class DatagramSocket : public ProtocolSocket {
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public:
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DatagramSocket(const char *name, net_socket *socket);
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virtual ~DatagramSocket();
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status_t InitCheck() const;
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status_t Enqueue(net_buffer *buffer);
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net_buffer *Dequeue(bool clone);
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status_t BlockingDequeue(bool clone, bigtime_t timeout,
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net_buffer **_buffer);
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void Clear();
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status_t SocketEnqueue(net_buffer *buffer);
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status_t SocketDequeue(uint32 flags, net_buffer **_buffer);
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ssize_t AvailableData() const;
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void WakeAll();
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net_socket *Socket() const { return fSocket; }
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protected:
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virtual status_t _SocketStatus() const;
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status_t _Enqueue(net_buffer *buffer);
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status_t _SocketEnqueue(net_buffer *buffer);
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net_buffer *_Dequeue(bool clone);
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void _Clear();
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status_t _Wait(bigtime_t timeout);
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void _NotifyOneReader(bool notifySocket);
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bool _IsEmpty() const { return fBuffers.IsEmpty(); }
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bigtime_t _SocketTimeout(uint32 flags) const;
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typedef typename LockingBase::Type LockType;
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typedef typename LockingBase::AutoLocker AutoLocker;
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typedef DoublyLinkedListCLink<net_buffer> NetBufferLink;
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typedef DoublyLinkedList<net_buffer, NetBufferLink> BufferList;
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sem_id fNotify;
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BufferList fBuffers;
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size_t fCurrentBytes;
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mutable LockType fLock;
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};
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#define DECL_DATAGRAM_SOCKET(args) \
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template<typename LockingBase, typename ModuleBundle> args \
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DatagramSocket<LockingBase, ModuleBundle>
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DECL_DATAGRAM_SOCKET(inline)::DatagramSocket(const char *name,
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net_socket *socket)
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: ProtocolSocket(socket), fCurrentBytes(0)
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{
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status_t status = LockingBase::Init(&fLock, name);
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if (status < B_OK)
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fNotify = status;
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else
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fNotify = create_sem(0, name);
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}
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DECL_DATAGRAM_SOCKET(inline)::~DatagramSocket()
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{
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_Clear();
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delete_sem(fNotify);
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LockingBase::Destroy(&fLock);
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::InitCheck() const
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{
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return fNotify;
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::Enqueue(net_buffer *buffer)
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{
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AutoLocker _(fLock);
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return _Enqueue(buffer);
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::_Enqueue(net_buffer *buffer)
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{
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if (fSocket->receive.buffer_size > 0
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&& (fCurrentBytes + buffer->size) > fSocket->receive.buffer_size)
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return ENOBUFS;
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fBuffers.Add(buffer);
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fCurrentBytes += buffer->size;
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_NotifyOneReader(true);
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return B_OK;
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::SocketEnqueue(net_buffer *_buffer)
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{
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AutoLocker _(fLock);
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return _SocketEnqueue(_buffer);
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::_SocketEnqueue(net_buffer *_buffer)
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{
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net_buffer *buffer = ModuleBundle::Buffer()->clone(_buffer, false);
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if (buffer == NULL)
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return B_NO_MEMORY;
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status_t status = _Enqueue(buffer);
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if (status < B_OK)
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ModuleBundle::Buffer()->free(buffer);
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return status;
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}
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DECL_DATAGRAM_SOCKET(inline net_buffer *)::Dequeue(bool clone)
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{
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AutoLocker _(fLock);
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return _Dequeue(clone);
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}
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DECL_DATAGRAM_SOCKET(inline net_buffer *)::_Dequeue(bool clone)
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{
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if (fBuffers.IsEmpty())
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return NULL;
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if (clone)
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return ModuleBundle::Buffer()->clone(fBuffers.Head(), false);
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net_buffer *buffer = fBuffers.RemoveHead();
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fCurrentBytes -= buffer->size;
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return buffer;
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::BlockingDequeue(bool clone,
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bigtime_t timeout, net_buffer **_buffer)
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{
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AutoLocker _(fLock);
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bool waited = false;
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while (fBuffers.IsEmpty()) {
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status_t status = _SocketStatus();
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if (status < B_OK)
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return status;
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if ((status = _Wait(timeout)) < B_OK)
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return status;
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waited = true;
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}
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*_buffer = _Dequeue(clone);
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if (clone && waited) {
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// we were signalled there was a new buffer in the
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// list; but since we are cloning, notify the next
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// waiting reader.
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_NotifyOneReader(false);
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}
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if (*_buffer == NULL)
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return B_NO_MEMORY;
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return B_OK;
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::SocketDequeue(uint32 flags,
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net_buffer **_buffer)
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{
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return BlockingDequeue(flags & MSG_PEEK, _SocketTimeout(flags), _buffer);
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}
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DECL_DATAGRAM_SOCKET(inline void)::Clear()
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{
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AutoLocker _(fLock);
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_Clear();
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}
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DECL_DATAGRAM_SOCKET(inline void)::_Clear()
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{
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BufferList::Iterator it = fBuffers.GetIterator();
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while (it.HasNext())
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ModuleBundle::Buffer()->free(it.Next());
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fCurrentBytes = 0;
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}
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DECL_DATAGRAM_SOCKET(inline ssize_t)::AvailableData() const
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{
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AutoLocker _(fLock);
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status_t status = _SocketStatus();
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if (status < B_OK)
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return status;
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return fCurrentBytes;
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::_SocketStatus() const
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{
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return B_OK;
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}
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DECL_DATAGRAM_SOCKET(inline status_t)::_Wait(bigtime_t timeout)
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{
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LockingBase::Unlock(&fLock);
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status_t status = acquire_sem_etc(fNotify, 1, B_CAN_INTERRUPT
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| B_ABSOLUTE_TIMEOUT, timeout);
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LockingBase::Lock(&fLock);
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return status;
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}
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DECL_DATAGRAM_SOCKET(inline void)::WakeAll()
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{
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release_sem_etc(fNotify, 0, B_RELEASE_ALL);
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}
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DECL_DATAGRAM_SOCKET(inline void)::_NotifyOneReader(bool notifySocket)
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{
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release_sem_etc(fNotify, 1, B_RELEASE_IF_WAITING_ONLY
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| B_DO_NOT_RESCHEDULE);
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if (notifySocket)
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ModuleBundle::Stack()->notify_socket(fSocket, B_SELECT_READ,
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fCurrentBytes);
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}
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DECL_DATAGRAM_SOCKET(inline bigtime_t)::_SocketTimeout(uint32 flags) const
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{
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bigtime_t timeout = fSocket->receive.timeout;
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if (flags & MSG_DONTWAIT)
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timeout = 0;
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else if (timeout != 0 && timeout != B_INFINITE_TIMEOUT)
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timeout += system_time();
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if (ModuleBundle::Stack()->is_restarted_syscall())
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timeout = ModuleBundle::Stack()->restore_syscall_restart_timeout();
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else
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ModuleBundle::Stack()->store_syscall_restart_timeout(timeout);
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return timeout;
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}
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#endif
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