ladybird/Kernel/Syscalls/lseek.cpp

24 lines
640 B
C++
Raw Normal View History

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/Process.h>
namespace Kernel {
KResultOr<FlatPtr> Process::sys$lseek(int fd, Userspace<off_t*> userspace_offset, int whence)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
REQUIRE_PROMISE(stdio);
auto description = TRY(fds().open_file_description(fd));
2021-03-14 00:02:54 +03:00
off_t offset;
TRY(copy_from_user(&offset, userspace_offset));
2021-09-05 17:17:24 +03:00
auto seek_result = TRY(description->seek(offset, whence));
return copy_to_user(userspace_offset, &seek_result);
}
}