Re: [uml-devel] handle_trap - failed to wait at end of syscall

[Joe Marzot <gmarzot@nortelnetworks.com>]

Jeff Dike wrote:
> gmarzot@nortelnetworks.com said:
> 
>>In our case the UML is launched like this:
>>perl script
>>   my $pid = fork();
>>   if ($pid == 0) {
>>      setpgrp(); # give all UMLs the same group id so I can renice them
>>      exec($cmd); 
> 
> 
> I think I understand what's happening.  You are (unwittingly) sending UML
> (and every process that belongs to it) a HUP when you, in effect, detach it
> from its parent terminal.

where am I detaching from the parent terminal?

I just did a little test and instead of invoking UML I start a little 
perl script in exactly the same way as above to catch SIGHUP...but no 
SIGHUP arrives.

> 
> My first thought was that SIGHUP isn't disabled in the userspace process,
> and it should be, but it is, so I don't know why it's even being seen by
> the ptracer.  It should only see signals which are enabled in the child.

more oddness.

> 
> In the meantime, while we figure this out, you might try just adding "nohup"
> to the beginning of your $cmd.

originally tried this but something bad happened...forget which I could 
go back and see ... and try setsid as the other poster suggested.

regards, GSM

> 
> 				Jeff
> 
> 
> 





-------------------------------------------------------
This SF.Net email is sponsored by: thawte's Crypto Challenge Vl
Crack the code and win a Sony DCRHC40 MiniDV Digital Handycam
Camcorder. More prizes in the weekly Lunch Hour Challenge.
Sign up NOW http://ad.doubleclick.net/clk;10740251;10262165;m
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel