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/*
* Copyright (c) 2022, Ariel Don <ariel@arieldon.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/StringView.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/KLexicalPath.h>
#include <Kernel/Process.h>
namespace Kernel {
ErrorOr<FlatPtr> Process::sys$utimensat(Userspace<Syscall::SC_utimensat_params const*> user_params)
{
VERIFY_NO_PROCESS_BIG_LOCK(this);
TRY(require_promise(Pledge::fattr));
auto params = TRY(copy_typed_from_user(user_params));
auto now = kgettimeofday().to_truncated_seconds();
int dirfd = params.dirfd;
int follow_symlink = params.flag & AT_SYMLINK_NOFOLLOW ? O_NOFOLLOW_NOERROR : 0;
timespec times[2];
if (params.times) {
TRY(copy_from_user(times, params.times, sizeof(times)));
if (times[0].tv_nsec == UTIME_NOW)
times[0].tv_sec = now;
if (times[1].tv_nsec == UTIME_NOW)
times[1].tv_sec = now;
} else {
// According to POSIX, both access and modification times are set to
// the current time given a nullptr.
times[0].tv_sec = now;
times[0].tv_nsec = UTIME_NOW;
times[1].tv_sec = now;
times[1].tv_nsec = UTIME_NOW;
}
OwnPtr<KString> path;
LockRefPtr<OpenFileDescription> description;
RefPtr<Custody> base;
auto path_or_error = get_syscall_path_argument(params.path);
if (path_or_error.is_error()) {
// If the path is empty ("") but not a nullptr, attempt to get a path
// from the file descriptor. This allows futimens() to be implemented
// in terms of utimensat().
if (params.path.characters && params.path.length == 0) {
description = TRY(open_file_description(dirfd));
path = TRY(description->original_absolute_path());
base = description->custody();
} else {
return path_or_error.release_error();
}
} else {
path = path_or_error.release_value();
if (dirfd == AT_FDCWD) {
base = current_directory();
} else {
description = TRY(open_file_description(dirfd));
if (!KLexicalPath::is_absolute(path->view()) && !description->is_directory())
return ENOTDIR;
if (!description->custody())
return EINVAL;
base = description->custody();
}
}
auto& atime = times[0];
auto& mtime = times[1];
TRY(VirtualFileSystem::the().utimensat(credentials(), path->view(), *base, atime, mtime, follow_symlink));
return 0;
}
}
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