[PATCH] libc: fix signal handling in system()

[Mike Frysinger]

On Monday 16 January 2012 14:58:25 Rich Felker wrote:
> OK, I'm dyslexic or something and somehow permuted the signal names
> every time I read it. Sorry. I think your approach probably works, but
> it also means system() is completely unsafe to use in multi-threaded
> programs that handle SIGCHLD...

which is acceptable to me.  from the spec:
Using the system() function in more than one thread in a process or when the 
SIGCHLD signal is being manipulated by more than one thread in a process may 
produce unexpected results.
-mike
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