linkat

fn linkat(
    old_dir: c.fd_t,
    old_path: [*:0]const u8,
    new_dir: c.fd_t,
    new_path: [*:0]const u8,
    flags: u32,
) File.HardLinkError!void {
    while (true) switch (c.errno(c.linkat(old_dir, old_path, new_dir, new_path, flags))) {
        .SUCCESS => return,
        .INTR => {},
        .ACCES => return error.AccessDenied,
        .DQUOT => return error.DiskQuota,
        .EXIST => return error.PathAlreadyExists,
        .IO => return error.HardwareFailure,
        .LOOP => return error.SymLinkLoop,
        .MLINK => return error.LinkQuotaExceeded,
        .NAMETOOLONG => return error.NameTooLong,
        .NOENT => return error.FileNotFound,
        .NOMEM => return error.SystemResources,
        .NOSPC => return error.NoSpaceLeft,
        .NOTDIR => return error.NotDir,
        .PERM => return error.PermissionDenied,
        .ROFS => return error.ReadOnlyFileSystem,
        .XDEV => return error.CrossDevice,
        .ILSEQ => return error.BadPathName,
        .FAULT => |err| return errnoBug(err),
        .INVAL => |err| return errnoBug(err),
        else => |err| return unexpectedErrno(err),
    };
}