As a first step towards managing linux user space in a chrooted /compat/linux, 
initially for i915 testing with intel gpu tools, later on to get widevine and 
steam to work I'm trying to get apt to work. I've fixed a number of issues to 
date in pseudofs/linprocfs but now I'm running in to a bug caused by 
differences in SIGCHLD handling between Linux and FreeBSD. The situation is 
that apt will spawn dpkg and wait on a pipe read. On Linux when dpkg exits the  
SIGCHLD to apt causes a short read on the pipe which lets apt then continue. On 
FreeBSD a SIGCHLD is silently ignored. I've even experimented with doing a kill 
-20 <apt pid> to no effect.
It would be easy enough to check sysvec against linux in pipe_read and break 
out of the loop when it's awakened from msleep (assuming there aren't deeper 
issues with signal propagation for anything other than SIGINT/SIGKILL) and then 
do a short read. However, I'm assuming that anyone who has worked in this area 
probably has a cleaner solution.

Thanks in advance.


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