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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/FileSystem/OpenFileDescription.h>
8#include <Kernel/Process.h>
9
10namespace Kernel {
11
12ErrorOr<FlatPtr> Process::sys$lseek(int fd, Userspace<off_t*> userspace_offset, int whence)
13{
14 VERIFY_NO_PROCESS_BIG_LOCK(this);
15 TRY(require_promise(Pledge::stdio));
16 auto description = TRY(open_file_description(fd));
17 off_t offset;
18 TRY(copy_from_user(&offset, userspace_offset));
19 auto seek_result = TRY(description->seek(offset, whence));
20 TRY(copy_to_user(userspace_offset, &seek_result));
21 return 0;
22}
23
24}