Right now we are trapping EACCESS and moving it to 'EAGAIN' for a flock().
But on some platforms you can get things like EWOULDBLOCK and EINTR too. In APR is there a convenient macro to figure out if the exit code is a 'hard' error (say EINVAL, EBADF, ENOTSUPP) or one to figure out if it is a retryable type error ? Dw
