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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
Notes: sideshowbarker 2024-07-17 12:02:22 +09:00 
Author: https://github.com/arieldon 🔰
Commit: https://github.com/SerenityOS/serenity/commit/9a6bd85924
Pull-request: https://github.com/SerenityOS/serenity/pull/14027
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
10 changed files with 146 additions and 0 deletions
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19
Kernel/FileSystem/VirtualFileSystem.cpp
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@@ -196,6 +196,25 @@ ErrorOr<void> VirtualFileSystem::utime(StringView path, Custody& base, time_t at
return {};
}
ErrorOr<void> VirtualFileSystem::utimensat(StringView path, Custody& base, timespec const& atime, timespec const& mtime, int options)
{
auto custody = TRY(resolve_path(path, base, nullptr, options));
auto& inode = custody->inode();
auto& current_process = Process::current();
if (!current_process.is_superuser() && inode.metadata().uid != current_process.euid())
return EACCES;
if (custody->is_readonly())
return EROFS;
// NOTE: A standard ext2 inode cannot store nanosecond timestamps.
if (atime.tv_nsec != UTIME_OMIT)
TRY(inode.set_atime(atime.tv_sec));
if (mtime.tv_nsec != UTIME_OMIT)
TRY(inode.set_mtime(mtime.tv_sec));
return {};
}
ErrorOr<InodeMetadata> VirtualFileSystem::lookup_metadata(StringView path, Custody& base, int options)
{
auto custody = TRY(resolve_path(path, base, nullptr, options));