On 11/28/2015 9:39 PM, Reinhard Kotucha wrote:
On 2015-11-28 at 15:08:43 +0100, luigi scarso wrote:
> On Sat, Nov 28, 2015 at 10:14 AM, Dirk Laurie <[email protected]> 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.
we might just as well keep the current implementation as it also needs
to hook in security options so we don't have to follow stock lua here;
one can always wrap os.execute into something that does what one wants
Hans
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