Re: startxwin.exe no longer exists?

On 17-Dec-2014 09:40, Erik Soderquist wrote:
> <snip>
>> There is no reason that should happen unless the startxwin script also
>> crashes - and that basically should never happen.  The script should 
>> clean
>> up any mess that the binary might leave, and it should handle all 
>> conditions
>> that might result from some process it has started crashing.  That is, 
>> in
>> the script (pseudocode):
>> 
>> # If there is an existing lock file:
>> #   Test is there also an existing X11 binary process?
>> #     yes - abort with message: X11 server already running
>> #     no  - remove lock file
>> ##########
>> # do whatever housekeeping is needed
>> #   then start binary
>> /path/X11_server_binary $args
>> #no matter how binary exits...
>> rm /path/.X*lock
>> 
>> The only time a script might not have a chance to run the last command 
>> is if
>> it starts the server via "nohup binary &", assuming such a thing is 
>> even
>> possible in cygwin, and then exits without waiting around for the 
>> binary to
>> exit.  Or, of course, if the whole system crashes, but that isn't the 
>> issue
>> the end users are having.
> 
> So you want your script to completely mask and/or destroy any evidence
> that something crashed??

No, that is the log file, this is the lock file.  It should rotate the 
log file from the previous run and delete the lock file.

> 
> Also, as the X server is not bound to a tty, it forks to the
> background on its own anyway, so your pseudocode example would delete
> the lock file just after the X server started.

In that case the the script needs to retrieve the PID of the forked 
process and wait for it to exit.

Regards,

David Mathog
[email protected]
Manager, Sequence Analysis Facility, Biology Division, Caltech

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