[luatex] os.execute

[Reinhard Kotucha]

On 2015-11-28 at 15:08:43 +0100, luigi scarso wrote:

 > On Sat, Nov 28, 2015 at 10:14 AM, Dirk Laurie <dirk.laurie at gmail.com> wrote:
 > 
 >     In Lua 5.2, the definition of os.execute changed to:
 >    
 >     This function is equivalent to the ISO C function system. It passes
 >     command to be executed by an operating system shell. Its first result
 >     is true if the command terminated successfully, or nil otherwise.
 >     After this first result the function returns a string and a number, as
 >     follows:
 >    
 >     "exit": the command terminated normally; the following number is the
 >     exit status of the command.
 >     "signal": the command was terminated by a signal; the following number
 >     is the signal that terminated the command.
 >    
 >     When called without a command, os.execute returns a boolean that is
 >     true if a shell is available.
 >    
 >     In Lua 5.1, it was:
 >    
 >     This function is equivalent to the C function system. It passes
 >     command to be executed by an operating system shell. It returns a
 >     status code, which is system-dependent. If command is absent, then it
 >     returns nonzero if a shell is available and zero otherwise.
 >    
 >     In LuaTeX, Version beta-0.76.0-2013121407  (TeX Live 2013/dev/Debian),
 >     _VERSION is "Lua 5.2" but os.execute still behaves as in Lua 5.1.
 >    
 >     Is this still true in Version 0.85.0? If so, is it a policy decision
 >     that one can rely on?
 > 
 > Thank you for the report.
 > We are seeing if we can jump to 5.3,
 > at some moment we will review also os.execute.

Hi Luigi,
as far as signals are concerned, I don't know whether they are
properly supported by Windows.  Honestly, I doubt.  Thus I recommend
to test them with stock Lua on various versions of Windows before
adapting LuaTeX.

Regards,
  Reinhard

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Reinhard Kotucha                            Phone: +49-511-3373112
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