Re: wait_reading_process_ouput hangs in certain cases (w/ patches)

[Paul Eggert]

Matthias Dahl wrote:
> I don't know if Emacs uses other non-universally available errno values
> as well. If it does, then, imho, it really does not matter here.

Emacs uses EOVERFLOW, ENOTSUP, EINPROGRESS, ENOTCONN, EMSGSIZE, EINPROGRESS, 
ELOOP, EWOULDBLOCK, even though they are not available on many platforms.

By the way, why does conf_post.h conditionally define EOVERFLOW, why does 
filelock.c have "#ifndef ELOOP", why does process.c have "#ifndef EWOULDBLOCK" 
and "defined EMSGSIZ", and why does sysdep.c have "#ifdef EOVERFLOW"? Do these 
all predate Gnulib errno.h? It sounds like we should remove them.