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Kernel: Give each FileDescriptor a chance to co-open sockets.

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Track how many fds are open for a socket's Accepted and Connected roles.
This allows fork() to clone a socket fd without a subsequent close() walking
all over the parent process's fd.
This commit is contained in:
Andreas Kling
2019-02-17 11:00:35 +01:00
parent b0be3299b5
commit d5f515cf6c
6 changed files with 51 additions and 27 deletions
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17
Kernel/FileDescriptor.cpp
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@@ -49,14 +49,14 @@ FileDescriptor::FileDescriptor(RetainPtr<Device>&& device)
FileDescriptor::FileDescriptor(RetainPtr<Socket>&& socket, SocketRole role)
: m_socket(move(socket))
, m_socket_role(role)
{
set_socket_role(role);
}
FileDescriptor::~FileDescriptor()
{
if (m_socket) {
m_socket->close(m_socket_role);
m_socket->detach_fd(m_socket_role);
m_socket = nullptr;
}
if (m_device) {
@@ -70,6 +70,16 @@ FileDescriptor::~FileDescriptor()
m_inode = nullptr;
}
void FileDescriptor::set_socket_role(SocketRole role)
{
if (role == m_socket_role)
return;
ASSERT(m_socket);
m_socket_role = role;
m_socket->attach_fd(role);
}
RetainPtr<FileDescriptor> FileDescriptor::clone()
{
RetainPtr<FileDescriptor> descriptor;
@@ -81,6 +91,9 @@ RetainPtr<FileDescriptor> FileDescriptor::clone()
if (m_device) {
descriptor = FileDescriptor::create(m_device.copy_ref());
descriptor->m_inode = m_inode.copy_ref();
} else if (m_socket) {
descriptor = FileDescriptor::create(m_socket.copy_ref(), m_socket_role);
descriptor->m_inode = m_inode.copy_ref();
} else {
descriptor = FileDescriptor::create(m_inode.copy_ref());
}