Mac OS X mach bootstrap context (or something) is wrong

[saurik]

In #218, @jcftang reported an issue using "w" from a mosh session connected to a Mac OS X 10.6.8 server. This issue is not equivalent to the race condition documented in #221: the workaround I presented there did not solve this issue (although you might need that workaround for fixes for this issue to be effective; untested).

The specific symptom (which I was easily able to reproduce) is an error report about the "DNS configuration info service", and the code that is failing is going to look like the function _dns_configuration_server_port from configd in dnsinfo_private.c (and may actually be exactly that code: that code may be part of a static library or common stub generation).

This bug does seem to be fixed (on my system with my reproduction: this is is as yet unconfirmed by @jcftang) by the code I submitted as part of pull request #219 that uses /bin/login to portably and correctly handle spawning the login shell.

$ w
could not lookup DNS configuration info service: (ipc/send) invalid destination port
15:56  up 9 days, 56 mins, 8 users, load averages: 0.95 1.00 0.87
USER     TTY      FROM              LOGIN@  IDLE WHAT
...

[keithw]

I'm going to have to defer to the Mac experts on basically all matters Mac.

But, worst case, we may have to declare Mac OS mosh-servers pre-10.7 to be unsupported.

[eminence]

Recommend closing this in favor of #249 which seems to have more discussion/details.

[cgull]

Closing as obsolete, please comment on #249 if you are having issues with this.