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