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Kernel+LibC+VFS: Implement utimensat(3)
Create POSIX utimensat() library call and corresponding system call to update file access and modification times.
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10 changed files with 146 additions and 0 deletions
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@ -1545,6 +1545,8 @@ ErrorOr<void> Ext2FSInode::set_atime(time_t t)
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MutexLocker locker(m_inode_lock);
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if (fs().is_readonly())
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return EROFS;
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if (t > INT32_MAX)
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return EINVAL;
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m_raw_inode.i_atime = t;
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set_metadata_dirty(true);
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return {};
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@ -196,6 +196,25 @@ ErrorOr<void> VirtualFileSystem::utime(StringView path, Custody& base, time_t at
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return {};
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}
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ErrorOr<void> VirtualFileSystem::utimensat(StringView path, Custody& base, timespec const& atime, timespec const& mtime, int options)
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{
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auto custody = TRY(resolve_path(path, base, nullptr, options));
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auto& inode = custody->inode();
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auto& current_process = Process::current();
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if (!current_process.is_superuser() && inode.metadata().uid != current_process.euid())
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return EACCES;
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if (custody->is_readonly())
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return EROFS;
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// NOTE: A standard ext2 inode cannot store nanosecond timestamps.
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if (atime.tv_nsec != UTIME_OMIT)
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TRY(inode.set_atime(atime.tv_sec));
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if (mtime.tv_nsec != UTIME_OMIT)
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TRY(inode.set_mtime(mtime.tv_sec));
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return {};
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}
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ErrorOr<InodeMetadata> VirtualFileSystem::lookup_metadata(StringView path, Custody& base, int options)
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{
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auto custody = TRY(resolve_path(path, base, nullptr, options));
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@ -64,6 +64,7 @@ public:
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ErrorOr<void> access(StringView path, int mode, Custody& base);
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ErrorOr<InodeMetadata> lookup_metadata(StringView path, Custody& base, int options = 0);
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ErrorOr<void> utime(StringView path, Custody& base, time_t atime, time_t mtime);
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ErrorOr<void> utimensat(StringView path, Custody& base, timespec const& atime, timespec const& mtime, int options = 0);
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ErrorOr<void> rename(StringView oldpath, StringView newpath, Custody& base);
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ErrorOr<void> mknod(StringView path, mode_t, dev_t, Custody& base);
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ErrorOr<NonnullRefPtr<Custody>> open_directory(StringView path, Custody& base);
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