fileSetTimestamps

fn fileSetTimestamps(
    userdata: ?*anyopaque,
    file: File,
    options: File.SetTimestampsOptions,
) File.SetTimestampsError!void {
    const t: *Threaded = @ptrCast(@alignCast(userdata));
    _ = t;

    if (is_windows) {
        const now_sys = if (options.access_timestamp == .now or options.modify_timestamp == .now)
            windows.ntdll.RtlGetSystemTimePrecise()
        else
            undefined;
        var iosb: windows.IO_STATUS_BLOCK = undefined;
        var info: windows.FILE.BASIC_INFORMATION = .{
            .CreationTime = 0,
            .LastAccessTime = switch (options.access_timestamp) {
                .unchanged => 0,
                .now => now_sys,
                .new => |ts| windows.toSysTime(ts),
            },
            .LastWriteTime = switch (options.modify_timestamp) {
                .unchanged => 0,
                .now => now_sys,
                .new => |ts| windows.toSysTime(ts),
            },
            .ChangeTime = 0,
            .FileAttributes = .{},
        };
        var syscall: Syscall = try .start();
        while (true) switch (windows.ntdll.NtSetInformationFile(
            file.handle,
            &iosb,
            &info,
            @sizeOf(windows.FILE.BASIC_INFORMATION),
            .Basic,
        )) {
            .SUCCESS => return syscall.finish(),
            .CANCELLED => try syscall.checkCancel(),
            else => |status| return syscall.unexpectedNtstatus(status),
        };
    }

    if (native_os == .wasi and !builtin.link_libc) {
        var atime: std.os.wasi.timestamp_t = 0;
        var mtime: std.os.wasi.timestamp_t = 0;
        var flags: std.os.wasi.fstflags_t = .{};

        switch (options.access_timestamp) {
            .unchanged => {},
            .now => flags.ATIM_NOW = true,
            .new => |ts| {
                atime = timestampToPosix(ts.nanoseconds).toTimestamp();
                flags.ATIM = true;
            },
        }

        switch (options.modify_timestamp) {
            .unchanged => {},
            .now => flags.MTIM_NOW = true,
            .new => |ts| {
                mtime = timestampToPosix(ts.nanoseconds).toTimestamp();
                flags.MTIM = true;
            },
        }

        const syscall: Syscall = try .start();
        while (true) switch (std.os.wasi.fd_filestat_set_times(file.handle, atime, mtime, flags)) {
            .SUCCESS => return syscall.finish(),
            .INTR => {
                try syscall.checkCancel();
                continue;
            },
            .BADF => |err| return syscall.errnoBug(err), // File descriptor use-after-free.
            .FAULT => |err| return syscall.errnoBug(err),
            .INVAL => |err| return syscall.errnoBug(err),
            .ACCES => return syscall.fail(error.AccessDenied),
            .PERM => return syscall.fail(error.PermissionDenied),
            .ROFS => return syscall.fail(error.ReadOnlyFileSystem),
            else => |err| return syscall.unexpectedErrno(err),
        };
    }

    var times_buffer: [2]posix.timespec = undefined;
    const times = if (options.modify_timestamp == .now and options.access_timestamp == .now) null else p: {
        times_buffer = .{
            setTimestampToPosix(options.access_timestamp),
            setTimestampToPosix(options.modify_timestamp),
        };
        break :p &times_buffer;
    };

    const syscall: Syscall = try .start();
    while (true) switch (posix.errno(posix.system.futimens(file.handle, times))) {
        .SUCCESS => return syscall.finish(),
        .INTR => {
            try syscall.checkCancel();
            continue;
        },
        .BADF => |err| return syscall.errnoBug(err), // always a race condition
        .FAULT => |err| return syscall.errnoBug(err),
        .INVAL => |err| return syscall.errnoBug(err),
        .ACCES => return syscall.fail(error.AccessDenied),
        .PERM => return syscall.fail(error.PermissionDenied),
        .ROFS => return syscall.fail(error.ReadOnlyFileSystem),
        else => |err| return syscall.unexpectedErrno(err),
    };
}