On 10/08/2021 13:58, Roland Roberts wrote:
I have a new, company-supplied Windows 10 laptop, using Cygwin to do
development. I’m having a problem getting XWin to launch apps. XWin
appears to be mostly working normally, meaning if I launch a Cygwin
mintty instance, I can manually set DISPLAY=:0.0 and start up X
application from the shell prompt. But trying to launch from my .XWinrc,
the application never displays and I can’t find a useful error log to
track down the issue. I’m pretty sure it’s some permission someplace my
account doesn’t have (and I can probably get IT to change that if I can
just identify what it is).
I'm not sure what the evidence for this hypothesis is?
[ 1490.390] executing '/bin/mintty', pid 772
[ 1902.312] executing '/bin/mintty', pid 1200
You can see the last two things that were launched. And here’s the
process list
29267 rrobert1> ps -ef
UID PID PPID TTY STIME COMMAND
rrobert1 610 1 ? 08:31:58 /usr/bin/mintty
rrobert1 471 1 ? 08:31:46 /usr/bin/gpg-agent
rrobert1 772 605 ? 08:32:24 /usr/bin/XWin
rrobert1 1205 611 pty0 08:39:31 /usr/bin/ps
rrobert1 403 1 cons0 08:31:42 /usr/bin/sh
rrobert1 442 1 ? 08:31:44 /usr/bin/ssh-agent
rrobert1 611 610 pty0 08:31:58 /usr/bin/bash
rrobert1 604 403 cons0 08:31:49 /usr/bin/xinit
rrobert1 1200 605 ? 08:39:16 /usr/bin/XWin
rrobert1 605 604 cons0 08:31:49 /usr/bin/XWin
rrobert1 609 604 ? 08:31:50 /usr/bin/sh
where you can see those processes are launch, but they show as
additional instances of XWin and mintty was never started. My .XWinrc
contain this
menu root {
"Cygwin Terminal" exec "/bin/mintty"
"Emacs" exec "/bin/emacs"
// […]
}
The process being created, but not changing command is usually
symptomatic of problems with cygwin's fork emulation (i.e. the child
process gets stuck during the complex synchronization it does with the
parent, before exec gets called)
Any suggestions on where to poke to diagnose this? My home Windows 10
machine has no problem at all. Oh, and cygcheck report version 3.1.4.
Yes, that’s a little old, but we are stuck there until we can work out
an issue with our build environment and the change for 3.1.5+ in how
symlinks are handled.
There are some suggestions about dealing with fork problems in the FAQ,
but sometimes nothing works and we don't know why.
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