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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.
29 lines
863 B
C++
29 lines
863 B
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/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$dup2(int old_fd, int new_fd)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::stdio));
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return m_fds.with_exclusive([&](auto& fds) -> ErrorOr<FlatPtr> {
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auto description = TRY(fds.open_file_description(old_fd));
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if (old_fd == new_fd)
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return new_fd;
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if (new_fd < 0 || static_cast<size_t>(new_fd) >= OpenFileDescriptions::max_open())
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return EINVAL;
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if (!fds.m_fds_metadatas[new_fd].is_allocated())
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fds.m_fds_metadatas[new_fd].allocate();
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fds[new_fd].set(move(description));
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return new_fd;
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});
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}
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}
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