Venix Emulator Update
Tracking down a silly bug
ls: Sig 44
That's weird. So I added tracing. I tried the cc command, which in this version is a simple program that orchestrates all the different parts of the compiler using fork, exec, dup and the strategic close/open pair to setup stdin etc. All the tracing looked good as well, we'd see something like:
123: fork() 124
124: ... lots of stuff
124: exit 0
123: wait pid 124 status 0
and then 123 would proceed to delete all the temp files and exit. It was like it was getting an error, despite its children exiting without an error. Every time it was like this, but only when I ran the optimizer. When I'd re-run the ls test, I'd get different Sig values as well.
Available 8086 compilers in 1985
The wait(2) system call...
which shows wait taking a pointer. So I assumed this was what the kernel received in the first arg that's passed into the kernel (DX). I assumed that DS:DX pointed to an integer where I'd return the status. Most of the time, DX was something that looked like a pointer on the stack, so I just did a copyout. The problem is that's not right.
So, I took another look at the manual. At the end of the man page I saw:
AX = pid of process
DX = status
and then it hit me. DX isn't a pointer to anything. After int 0xf1 AX is the pid of the process (the normal return value) and DX is the status. Disassembling wait.o confirmed this:if statusp is not 0, dx is copied back to *statusp. Doh! The classic pointer vs value mistake. Fixing my implementation to take out the copyout and replace it with setting DX in the processor context made pcc work. And cc worked. And the silly test programs I wrote in the middle to debug things worked. Woo Hoo!
Once I fixed this, all weird combinations of compilations suddenly worked for me. I could optimize, strip, etc and there were no oddities.