GNU bug report logs - #1107
23.0.60; Emacs --daemon crashes when emacsclient tries to establish a connection on OS X

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From: Adrian Robert <adrian.b.robert <at> gmail.com>
To: Dan Nicolaescu <dann <at> ics.uci.edu>
Cc: 1107 <at> debbugs.gnu.org
Subject: bug#1107: #1107 - 23.0.60; Emacs --daemon crashes when emacsclient tries to establish a connection on OS X - Emacs bug report logs
Date: Tue, 25 Nov 2008 16:15:24 -0500

On Nov 25, 2008, at 3:34 PM, Dan Nicolaescu wrote:

> Adrian Robert <adrian.b.robert <at> gmail.com> writes:
>
>> OK, it seems that the NS GUI stuff cannot be used in a child process
>> from fork():
>>
>> http://developer.apple.com/ReleaseNotes/CoreFoundation/CoreFoundation.html
>>
>> (search for "fork"):
>>
>>> Due to the behavior of fork(), CoreFoundation cannot be used on the
>>> child-side of fork(). If you fork(), you must follow that with an
>>> exec*() call of some sort, and you should not use CoreFoundation
>>> APIs within the child, before the exec*().
>
> Bleah, how ugly.  Do you know if this is also a problem if you never  
> use
> CoreFoundation (whatever that is) before the fork() call?

The problem is AFTER the fork.  CoreFoundation means any use of Cocoa  
GUI stuff.


>> The emacsclient must be given "--socket-name /tmp/emacs503/server" to
>> find the server.  Else it gives "No socket or alternate editor."
>>
>> On the other hand, if I start emacs -Q and run 'server-start', this
>> argument is NOT needed, and furthermore if it IS given it, it fails
>> with "connect: Connection refused".
>>
>> Any insight into what is happening here?
>
> What is (daemonp) returning?  When using --daemon, if the value  
> returned by
> (daemonp) is a string is used to set `server-name', before calling
> `server-start'.

If run with --daemon now, it returns "t".  If run emacs -Q then  
"server-start" it returns "nil".

server-name is "server" in both cases.

Here's some more info.  If I do 'lsof | grep <process ID>', when  
running --daemon, I get:

Emacs      6608 arobert    3u    unix 0x11bf3110       0t0           / 
tmp/emacs503/server

whereas when running normal+server-start I get:

Emacs      6600 arobert    6u    unix 0x11bf3110       0t0           / 
var/folders/90/90K8geLYFgW7CC5i5eRKmk+++TQ/-Tmp-/emacs503/server

Does this tell anything?  I'm not too knowledgeable about sockets, but  
the second one looks more "official".

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