Return codes over 1 byte

Michael DePaulo mikedep333@gmail.com
Fri Jul 10 00:21:00 GMT 2015


On Thu, Jul 9, 2015 at 7:42 PM, Yaakov Selkowitz <yselkowitz@cygwin.com> wrote:
> On Thu, 2015-07-09 at 19:30 -0400, Michael DePaulo wrote:
>> mark06 mentioned this on IRC today and then left the channel about 1 hour later:
>>
>> <mark06> has anyone ever discussed exit codes above one byte? they are
>> valid on modern windows, but cygwin's bash will mess them
>>
>> I was curious, so I googled it (I could not find an answer) and then
>> tried it out. I can confirm the what he said.
>
> http://pubs.opengroup.org/onlinepubs/9699919799/functions/exit.html
> https://www.gnu.org/software/libc/manual/html_node/Exit-Status.html
>
> --
> Yaakov

Right, only the least significant 8 bits are outputted. So "257" becomes "1".

I thought I read somewhere that the Cygwin mintty terminal + bash
shell is supposed to be suitable for running native windows apps.
Maybe I was thinking of the 1st paragraph on this page after the list
of features:
https://code.google.com/p/mintty/

Or maybe I was thinking about this reply:
https://cygwin.com/ml/cygwin/2007-03/msg00758.html

Either way, I feel like this should be documented somewhere. Perhaps I
should submit a patch to add a section like "return codes" to to this
page?
https://cygwin.com/cygwin-ug-net/using-effectively.html
https://cygwin.com/git/gitweb.cgi?p=newlib-cygwin.git;a=blob;f=winsup/doc/effectively.xml

-Mike

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