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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
27 lines
651 B
C++
27 lines
651 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/FileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<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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REQUIRE_PROMISE(stdio);
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auto description = fds().file_description(old_fd);
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if (!description)
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return EBADF;
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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) >= fds().max_open())
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return EINVAL;
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m_fds[new_fd].set(*description);
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return new_fd;
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}
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}
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