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Kernel: Use KResultOr<size_t> for the DoubleBuffer class
This commit is contained in:
parent
1c3346e3ce
commit
ca3cae81eb
Notes:
sideshowbarker
2024-07-18 12:10:18 +09:00
Author: https://github.com/gunnarbeutner Commit: https://github.com/SerenityOS/serenity/commit/ca3cae81eb8 Pull-request: https://github.com/SerenityOS/serenity/pull/8093 Reviewed-by: https://github.com/awesomekling
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@ -40,7 +40,7 @@ void DoubleBuffer::flip()
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compute_lockfree_metadata();
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}
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ssize_t DoubleBuffer::write(const UserOrKernelBuffer& data, size_t size)
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KResultOr<size_t> DoubleBuffer::write(const UserOrKernelBuffer& data, size_t size)
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{
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if (!size || m_storage.is_null())
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return 0;
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@ -48,15 +48,15 @@ ssize_t DoubleBuffer::write(const UserOrKernelBuffer& data, size_t size)
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size_t bytes_to_write = min(size, m_space_for_writing);
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u8* write_ptr = m_write_buffer->data + m_write_buffer->size;
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if (!data.read(write_ptr, bytes_to_write))
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return -EFAULT;
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return EFAULT;
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m_write_buffer->size += bytes_to_write;
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compute_lockfree_metadata();
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if (m_unblock_callback && !m_empty)
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m_unblock_callback();
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return (ssize_t)bytes_to_write;
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return bytes_to_write;
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}
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ssize_t DoubleBuffer::read(UserOrKernelBuffer& data, size_t size)
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KResultOr<size_t> DoubleBuffer::read(UserOrKernelBuffer& data, size_t size)
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{
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if (!size || m_storage.is_null())
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return 0;
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@ -67,15 +67,15 @@ ssize_t DoubleBuffer::read(UserOrKernelBuffer& data, size_t size)
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return 0;
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size_t nread = min(m_read_buffer->size - m_read_buffer_index, size);
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if (!data.write(m_read_buffer->data + m_read_buffer_index, nread))
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return -EFAULT;
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return EFAULT;
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m_read_buffer_index += nread;
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compute_lockfree_metadata();
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if (m_unblock_callback && m_space_for_writing > 0)
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m_unblock_callback();
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return (ssize_t)nread;
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return nread;
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}
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ssize_t DoubleBuffer::peek(UserOrKernelBuffer& data, size_t size)
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KResultOr<size_t> DoubleBuffer::peek(UserOrKernelBuffer& data, size_t size)
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{
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if (!size || m_storage.is_null())
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return 0;
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@ -87,11 +87,11 @@ ssize_t DoubleBuffer::peek(UserOrKernelBuffer& data, size_t size)
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return 0;
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size_t nread = min(m_read_buffer->size - m_read_buffer_index, size);
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if (!data.write(m_read_buffer->data + m_read_buffer_index, nread))
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return -EFAULT;
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return EFAULT;
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compute_lockfree_metadata();
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if (m_unblock_callback && m_space_for_writing > 0)
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m_unblock_callback();
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return (ssize_t)nread;
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return nread;
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}
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}
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@ -18,19 +18,19 @@ class DoubleBuffer {
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public:
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explicit DoubleBuffer(size_t capacity = 65536);
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[[nodiscard]] ssize_t write(const UserOrKernelBuffer&, size_t);
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[[nodiscard]] ssize_t write(const u8* data, size_t size)
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[[nodiscard]] KResultOr<size_t> write(const UserOrKernelBuffer&, size_t);
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[[nodiscard]] KResultOr<size_t> write(const u8* data, size_t size)
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{
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return write(UserOrKernelBuffer::for_kernel_buffer(const_cast<u8*>(data)), size);
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}
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[[nodiscard]] ssize_t read(UserOrKernelBuffer&, size_t);
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[[nodiscard]] ssize_t read(u8* data, size_t size)
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[[nodiscard]] KResultOr<size_t> read(UserOrKernelBuffer&, size_t);
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[[nodiscard]] KResultOr<size_t> read(u8* data, size_t size)
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{
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auto buffer = UserOrKernelBuffer::for_kernel_buffer(data);
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return read(buffer, size);
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}
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[[nodiscard]] ssize_t peek(UserOrKernelBuffer&, size_t);
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[[nodiscard]] ssize_t peek(u8* data, size_t size)
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[[nodiscard]] KResultOr<size_t> peek(UserOrKernelBuffer&, size_t);
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[[nodiscard]] KResultOr<size_t> peek(u8* data, size_t size)
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{
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auto buffer = UserOrKernelBuffer::for_kernel_buffer(data);
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return peek(buffer, size);
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@ -270,17 +270,17 @@ KResultOr<size_t> IPv4Socket::receive_byte_buffered(FileDescription& description
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VERIFY(!m_receive_buffer.is_empty());
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int nreceived;
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KResultOr<size_t> nreceived_or_error { 0 };
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if (flags & MSG_PEEK)
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nreceived = m_receive_buffer.peek(buffer, buffer_length);
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nreceived_or_error = m_receive_buffer.peek(buffer, buffer_length);
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else
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nreceived = m_receive_buffer.read(buffer, buffer_length);
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nreceived_or_error = m_receive_buffer.read(buffer, buffer_length);
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if (nreceived > 0 && !(flags & MSG_PEEK))
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Thread::current()->did_ipv4_socket_read((size_t)nreceived);
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if (!nreceived_or_error.is_error() && nreceived_or_error.value() > 0 && !(flags & MSG_PEEK))
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Thread::current()->did_ipv4_socket_read(nreceived_or_error.value());
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set_can_read(!m_receive_buffer.is_empty());
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return nreceived;
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return nreceived_or_error;
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}
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KResultOr<size_t> IPv4Socket::receive_packet_buffered(FileDescription& description, UserOrKernelBuffer& buffer, size_t buffer_length, int flags, Userspace<sockaddr*> addr, Userspace<socklen_t*> addr_length, Time& packet_timestamp)
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@ -418,8 +418,8 @@ bool IPv4Socket::did_receive(const IPv4Address& source_address, u16 source_port,
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auto nreceived_or_error = protocol_receive(ReadonlyBytes { packet.data(), packet.size() }, scratch_buffer, m_scratch_buffer.value().size(), 0);
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if (nreceived_or_error.is_error())
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return false;
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ssize_t nwritten = m_receive_buffer.write(scratch_buffer, nreceived_or_error.value());
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if (nwritten < 0)
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auto nwritten_or_error = m_receive_buffer.write(scratch_buffer, nreceived_or_error.value());
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if (nwritten_or_error.is_error())
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return false;
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set_can_read(!m_receive_buffer.is_empty());
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} else {
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@ -293,10 +293,10 @@ KResultOr<size_t> LocalSocket::sendto(FileDescription& description, const UserOr
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auto* socket_buffer = send_buffer_for(description);
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if (!socket_buffer)
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return EINVAL;
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ssize_t nwritten = socket_buffer->write(data, data_size);
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if (nwritten > 0)
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Thread::current()->did_unix_socket_write(nwritten);
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return nwritten;
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auto nwritten_or_error = socket_buffer->write(data, data_size);
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if (!nwritten_or_error.is_error() && nwritten_or_error.value() > 0)
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Thread::current()->did_unix_socket_write(nwritten_or_error.value());
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return nwritten_or_error;
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}
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DoubleBuffer* LocalSocket::receive_buffer_for(FileDescription& description)
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@ -338,10 +338,10 @@ KResultOr<size_t> LocalSocket::recvfrom(FileDescription& description, UserOrKern
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if (!has_attached_peer(description) && socket_buffer->is_empty())
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return 0;
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VERIFY(!socket_buffer->is_empty());
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auto nread = socket_buffer->read(buffer, buffer_size);
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if (nread > 0)
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Thread::current()->did_unix_socket_read(nread);
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return nread;
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auto nread_or_error = socket_buffer->read(buffer, buffer_size);
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if (!nread_or_error.is_error() && nread_or_error.value() > 0)
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Thread::current()->did_unix_socket_read(nread_or_error.value());
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return nread_or_error;
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}
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StringView LocalSocket::socket_path() const
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