[Toybox] default SIGPIPE handler that calls _exit(0)?

[Rich Felker]

On Mon, Apr 27, 2015 at 12:39:15PM -0700, enh wrote:
> >> plus there's the question of whether giving up because you're writing
> >> to a broken pipe is an error exit or not. you could add a special case
> >> to xwrite (and add xprintf and xputs and...), but since the whole idea
> >> is that code shouldn't have to care, it's easier just to install a
> >> signal handler that does _exit(0).
> >
> > There are xputs and xprintf already.
> >
> > Calling _exit() is wrong for toybox, since you cannot use atexit()
> > type code (eg, delete tempfiles on exit) - xexit() is the recommended
> > path for toybox.
> > Using a fixed return value is wrong; for an example, grep returns
> > 0 for "line matched", 1 for "no match", and >1 for errors.
> 
> (GNU grep 2.16 thinks grep should just die with SIGPIPE.)

I'm perfectly fine with any result that's properly distinguishable
from result code with defined meanings -- especially 0 (success) and
in the case of grep 1 (successful run with no match). It's probably
wrong for Android to be treating SIGPIPE as a crash to begin with.

Rich

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