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Kernel: Support non-blocking connect().

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If connect() is called on a non-blocking socket, it will "fail" immediately
with -EINPROGRESS. After that, you select() on the socket and wait for it to
become writable.
This commit is contained in:
Andreas Kling 2019-04-08 04:52:21 +02:00
parent 7fcca0ce4b
commit 65d6318c33
Notes: sideshowbarker 2024-07-19 14:47:37 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/65d6318c33c
11 changed files with 22 additions and 17 deletions
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6
Kernel/Net/IPv4Socket.cpp
View File

@ -66,7 +66,7 @@ KResult IPv4Socket::bind(const sockaddr* address, socklen_t address_size)
ASSERT_NOT_REACHED();
}
KResult IPv4Socket::connect(const sockaddr* address, socklen_t address_size)
KResult IPv4Socket::connect(const sockaddr* address, socklen_t address_size, ShouldBlock should_block)
{
ASSERT(!m_bound);
if (address_size != sizeof(sockaddr_in))
@ -78,7 +78,7 @@ KResult IPv4Socket::connect(const sockaddr* address, socklen_t address_size)
m_destination_address = IPv4Address((const byte*)&ia.sin_addr.s_addr);
m_destination_port = ntohs(ia.sin_port);
return protocol_connect();
return protocol_connect(should_block);
}
void IPv4Socket::attach_fd(SocketRole)
@ -110,7 +110,7 @@ ssize_t IPv4Socket::write(SocketRole, const byte* data, ssize_t size)
bool IPv4Socket::can_write(SocketRole) const
{
return true;
return is_connected();
}
int IPv4Socket::allocate_source_port_if_needed()

4
Kernel/Net/IPv4Socket.h
View File

@ -21,7 +21,7 @@ public:
static Lockable<HashTable<IPv4Socket*>>& all_sockets();
virtual KResult bind(const sockaddr*, socklen_t) override;
virtual KResult connect(const sockaddr*, socklen_t) override;
virtual KResult connect(const sockaddr*, socklen_t, ShouldBlock = ShouldBlock::Yes) override;
virtual bool get_address(sockaddr*, socklen_t*) override;
virtual void attach_fd(SocketRole) override;
virtual void detach_fd(SocketRole) override;
@ -49,7 +49,7 @@ protected:
virtual int protocol_receive(const ByteBuffer&, void*, size_t, int, sockaddr*, socklen_t*) { return -ENOTIMPL; }
virtual int protocol_send(const void*, int) { return -ENOTIMPL; }
virtual KResult protocol_connect() { return KSuccess; }
virtual KResult protocol_connect(ShouldBlock) { return KSuccess; }
virtual int protocol_allocate_source_port() { return 0; }
virtual bool protocol_is_disconnected() const { return false; }

2
Kernel/Net/LocalSocket.cpp
View File

@ -65,7 +65,7 @@ KResult LocalSocket::bind(const sockaddr* address, socklen_t address_size)
return KSuccess;
}
KResult LocalSocket::connect(const sockaddr* address, socklen_t address_size)
KResult LocalSocket::connect(const sockaddr* address, socklen_t address_size, ShouldBlock)
{
ASSERT(!m_bound);
if (address_size != sizeof(sockaddr_un))

2
Kernel/Net/LocalSocket.h
View File

@ -11,7 +11,7 @@ public:
virtual ~LocalSocket() override;
virtual KResult bind(const sockaddr*, socklen_t) override;
virtual KResult connect(const sockaddr*, socklen_t) override;
virtual KResult connect(const sockaddr*, socklen_t, ShouldBlock = ShouldBlock::Yes) override;
virtual bool get_address(sockaddr*, socklen_t*) override;
virtual void attach_fd(SocketRole) override;
virtual void detach_fd(SocketRole) override;

1
Kernel/Net/NetworkTask.cpp
View File

@ -342,6 +342,7 @@ void handle_tcp(const EthernetFrameHeader& eth, int frame_size)
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
socket->send_tcp_packet(TCPFlags::FIN | TCPFlags::ACK);
socket->set_state(TCPSocket::State::Disconnecting);
socket->set_connected(false);
return;
}

3
Kernel/Net/Socket.h
View File

@ -9,6 +9,7 @@
#include <Kernel/KResult.h>
enum class SocketRole { None, Listener, Accepted, Connected, Connecting };
enum class ShouldBlock { No = 0, Yes = 1 };
class Socket : public Retainable<Socket> {
public:
@ -25,7 +26,7 @@ public:
KResult listen(int backlog);
virtual KResult bind(const sockaddr*, socklen_t) = 0;
virtual KResult connect(const sockaddr*, socklen_t) = 0;
virtual KResult connect(const sockaddr*, socklen_t, ShouldBlock) = 0;
virtual bool get_address(sockaddr*, socklen_t*) = 0;
virtual bool is_local() const { return false; }
virtual bool is_ipv4() const { return false; }

13
Kernel/Net/TCPSocket.cpp
View File

@ -152,7 +152,7 @@ NetworkOrdered<word> TCPSocket::compute_tcp_checksum(const IPv4Address& source,
return ~(checksum & 0xffff);
}
KResult TCPSocket::protocol_connect()
KResult TCPSocket::protocol_connect(ShouldBlock should_block)
{
auto* adapter = adapter_for_route_to(destination_address());
if (!adapter)
@ -166,11 +166,14 @@ KResult TCPSocket::protocol_connect()
send_tcp_packet(TCPFlags::SYN);
m_state = State::Connecting;
current->set_blocked_socket(this);
current->block(Thread::BlockedConnect);
if (should_block == ShouldBlock::Yes) {
current->set_blocked_socket(this);
current->block(Thread::BlockedConnect);
ASSERT(is_connected());
return KSuccess;
}
ASSERT(is_connected());
return KSuccess;
return KResult(-EINPROGRESS);
}
int TCPSocket::protocol_allocate_source_port()

2
Kernel/Net/TCPSocket.h
View File

@ -34,7 +34,7 @@ private:
virtual int protocol_receive(const ByteBuffer&, void* buffer, size_t buffer_size, int flags, sockaddr* addr, socklen_t* addr_length) override;
virtual int protocol_send(const void*, int) override;
virtual KResult protocol_connect() override;
virtual KResult protocol_connect(ShouldBlock) override;
virtual int protocol_allocate_source_port() override;
virtual bool protocol_is_disconnected() const override;

2
Kernel/Net/UDPSocket.cpp
View File

@ -81,7 +81,7 @@ int UDPSocket::protocol_send(const void* data, int data_length)
return data_length;
}
KResult UDPSocket::protocol_connect()
KResult UDPSocket::protocol_connect(ShouldBlock)
{
return KSuccess;
}

2
Kernel/Net/UDPSocket.h
View File

@ -17,7 +17,7 @@ private:
virtual int protocol_receive(const ByteBuffer&, void* buffer, size_t buffer_size, int flags, sockaddr* addr, socklen_t* addr_length) override;
virtual int protocol_send(const void*, int) override;
virtual KResult protocol_connect() override;
virtual KResult protocol_connect(ShouldBlock) override;
virtual int protocol_allocate_source_port() override;
};

2
Kernel/Process.cpp
View File

@ -2038,7 +2038,7 @@ int Process::sys$connect(int sockfd, const sockaddr* address, socklen_t address_
return -EISCONN;
auto& socket = *descriptor->socket();
descriptor->set_socket_role(SocketRole::Connecting);
auto result = socket.connect(address, address_size);
auto result = socket.connect(address, address_size, descriptor->is_blocking() ? ShouldBlock::Yes : ShouldBlock::No);
if (result.is_error()) {
descriptor->set_socket_role(SocketRole::None);
return result;