Re: shell return values

Lars Ivar Igesund wrote:

> Hmm, consider this code from Util.py; logged_system(). This shows
> that the return value from os.system() is dealt with also on winxp.
> In my case it returns 1. I see no reason why that should mean that
> an error happened. My program runs flawlessly (at least for the test
> in question), using D's printf (really the C printf) for the output.

It's not uncommon for programmers to forget about the exit value.
Mostly this is when main() returns without a value.

For programs like make and Aap the exit value is the only way to detect
whether an error occurred.  Most compilers do return a valid exit code,
thus Aap uses this to decide whether compilation was successful.  For
programs that do not have a valid exit code, you could complain to the
writer.

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