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bug#31901: Incorrect make-network-process + nowait state handling for no

From: Noam Postavsky
Subject: bug#31901: Incorrect make-network-process + nowait state handling for non-existing unix sockets in emacs-26.1
Date: Sun, 01 Jul 2018 11:21:06 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

tags 31901 + confirmed

Mike Kazantsev <address@hidden> writes:

> As far as I can tell, this is not documented behavior, definitely
> unexpected, breaks all old code that used unix sockets, and probably
> unintentional, i.e. a bug.

It seems to be due to this is_non_blocking_client check in

  if (s < 0)
      /* If non-blocking got this far - and failed - assume non-blocking is
         not supported after all.  This is probably a wrong assumption, but
         the normal blocking calls to open-network-stream handles this error
         better.  */
      if (p->is_non_blocking_client)

      report_file_errno ((p->is_server
                          ? "make server process failed"
                          : "make client process failed"),
                         contact, xerrno);

In Emacs 25, this check was directly in Fmake_network_process before the
process object creation code, so we would just return nil in that case.
Seems to have changed, I assume accidentally, in [1: e09c0972c3].

[1: e09c0972c3]: 2016-01-28 23:50:47 +0100
  Refactor make_network_process

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