Re: dietlibc (0.31), fork and pthreads

Hi,

thanks for looking into this!

> Get used to compile with all warnings enabled, it helps.

Okay, granted, in the little test app, I didn't take care of the headers and 
stuff, but the real problem occurs in a larger application, and there, all 
headers etc. are there.

> If you do it, you'll be tempted to #include the missing headers, and the
> program won't compile because of "waitpid(pid)";

Agreed.

> fixing it solved the 
> problem on my machine.

Interesting! I recompiled all four cases I mentioned above 
with -Wall -pedantic, fixed all compiler warnings, and the problem persists. 
I can't imagine how additional headers and a fixed waitpid should alter the 
behaviour of the fork() and pipe() before, anyway.

> Except that I still don't know why it would print "0": my only guess
> (the missing "int *" param overwriting something) doesn't really explain
> it, so if anybody knows better, I'm curious to hear the explanation.
> (thanks anyone)

No... this doesn't seem to have anything to do with it. I still got the 
behaviour in my tests, as mentioned. So... you can't reproduce the problem on 
your machine with 'diet gcc -Wall -pedantic -o test forktest.c -lpthread'? 
(note the linking of pthread!) If so, it would be interesting to compare the 
build environments; maybe there's some important difference. Can you post 
your build env specs?

I am compiling with a gcc 4.4.1-4ubuntu0, dietlibc 0.31-1.2ubuntu2, on an x86 
machine running ubuntu 9.10.


Cheers,
  Tim

-- 
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
<>                                                              <>
<> Tim München, M.Sc.        [email protected]   <>
<> Bergische Universitaet                                       <>
<> FB C - Physik             Tel.: +49 (0)202 439-3521          <>
<> Gaussstr. 20              Fax : +49 (0)202 439-2811          <>
<> 42097 Wuppertal                                              <>
<>                                                              <>
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>