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Kernel+LibC+VFS: Implement utimensat(3)

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Create POSIX utimensat() library call and corresponding system call to
update file access and modification times.
This commit is contained in:
Ariel Don 2022-05-02 15:26:10 -05:00 • committed by Andreas Kling
parent 7550017f97
commit 9a6bd85924
10 changed files with 146 additions and 0 deletions
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61
Kernel/Syscalls/utimensat.cpp Normal file
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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_PROCESS_BIG_LOCK_ACQUIRED(this);
TRY(require_promise(Pledge::fattr));
auto params = TRY(copy_typed_from_user(user_params));
auto now = kgettimeofday().to_truncated_seconds();
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;
}
int dirfd = params.dirfd;
auto path = TRY(get_syscall_path_argument(params.path));
RefPtr<Custody> base;
if (dirfd == AT_FDCWD) {
base = current_directory();
} else {
auto base_description = TRY(open_file_description(dirfd));
if (!KLexicalPath::is_absolute(path->view()) && !base_description->is_directory())
return ENOTDIR;
if (!base_description->custody())
return EINVAL;
base = base_description->custody();
}
auto& atime = times[0];
auto& mtime = times[1];
int follow_symlink = params.flag & AT_SYMLINK_NOFOLLOW ? O_NOFOLLOW_NOERROR : 0;
TRY(VirtualFileSystem::the().utimensat(path->view(), *base, atime, mtime, follow_symlink));
return 0;
}
}