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28 lines
810 B
C++
28 lines
810 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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// NOTE: The length is passed by pointer because off_t is 64bit,
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// hence it can't be passed by register on 32bit platforms.
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ErrorOr<FlatPtr> Process::sys$ftruncate(int fd, Userspace<off_t const*> userspace_length)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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auto length = TRY(copy_typed_from_user(userspace_length));
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if (length < 0)
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return EINVAL;
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auto description = TRY(open_file_description(fd));
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if (!description->is_writable())
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return EBADF;
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TRY(description->truncate(static_cast<u64>(length)));
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return 0;
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}
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}
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