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b56646e293
There's no reason for this to use a spinlock. Instead, let's allow threads to block if someone else is using the descriptor table.
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Net/LocalSocket.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$sendfd(int sockfd, int fd)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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TRY(require_promise(Pledge::sendfd));
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auto socket_description = TRY(open_file_description(sockfd));
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if (!socket_description->is_socket())
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return ENOTSOCK;
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auto& socket = *socket_description->socket();
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if (!socket.is_local())
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return EAFNOSUPPORT;
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if (!socket.is_connected())
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return ENOTCONN;
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auto passing_description = TRY(open_file_description(fd));
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auto& local_socket = static_cast<LocalSocket&>(socket);
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TRY(local_socket.sendfd(*socket_description, move(passing_description)));
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$recvfd(int sockfd, int options)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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TRY(require_promise(Pledge::recvfd));
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auto socket_description = TRY(open_file_description(sockfd));
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if (!socket_description->is_socket())
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return ENOTSOCK;
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auto& socket = *socket_description->socket();
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if (!socket.is_local())
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return EAFNOSUPPORT;
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auto fd_allocation = TRY(m_fds.with_exclusive([](auto& fds) { return fds.allocate(); }));
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auto& local_socket = static_cast<LocalSocket&>(socket);
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auto received_description = TRY(local_socket.recvfd(*socket_description));
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u32 fd_flags = 0;
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if (options & O_CLOEXEC)
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fd_flags |= FD_CLOEXEC;
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m_fds.with_exclusive([&](auto& fds) { fds[fd_allocation.fd].set(move(received_description), fd_flags); });
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return fd_allocation.fd;
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}
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}
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