^C not getting to sub, sub, sub, sub processes (was: Re: 1.5.4s assertion "hsig_inited" failed)

[Rolf Campbell]

Christopher Faylor wrote:

> On Fri, Aug 15, 2003 at 09:10:12PM -0400, Rolf Campbell wrote:
> 
>>Christopher Faylor wrote:
>>
>>>On Mon, Sep 08, 2003 at 04:44:58PM -0400, Rolf Campbell wrote:
>>>
>>>>I started a large build, then hit ^Z.  Then "fg", and this is what 
>>>>happened:
>>>
>>>A large build shouldn't even recognize the ^Z if you are running this from
>>>the console.  Your TERM=xterm below.  Are you running this under X?
>>
>>I am using RXVT.  Does RXVT set TERM=xterm?  That's my only guess, I 
>>don't set that variable myself.
> 
> 
> Huh.  I guess so.  It does so for me, as well.
> 
> This problem sounded familiar so I did a little archive diving.  It was
> reported before and I investigated it before.  I remember thinking that
> this would be hard to fix owing to a race condition with signals in tty
> code.  I can make this fail in various interesting ways even outside of
> the pty/tty code, though.  So, I'm investigating why now.
> 
> cgf
> 

I have a reproducable (at least on my machine) of some ^C handling issues.

#!/bin/python
import sys, os, select

if(int(sys.argv[1]) > 0):
     os.system(sys.argv[0] + " %d" % (int(sys.argv[1])-1))
else:
     select.select([], [], [], 10)


Try running this as "./deep.py 0", and then, when it's waiting, hit ^C, 
it will terminate fine.  Now try it as "./deep.py 1", and then hit ^C. 
Nothing happens.  I see this when I try to cancel my build, but ^C 
doesn't work when the process tree is too deep.
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