Re: os.execute returns mangled exit code on linux

[Rena <hyperhacker@...>]

On Fri, Jan 18, 2013 at 6:58 PM, Richard Geary <richardg.work@gmail.com> wrote:
> This was first mentioned on the mailing list in 2004, but the bug still
> exists today :
> print( os.execute("exit 1") )
> 256
>
> The reason this is bad, is running os.exit(os.execute(cmd)) will always
> return 0, as only the lowest 8 bits of the exit code are used.
>
> The cause is the os_execute function is returning the full return value of
> the call to system(), without processing it for the exit code. The fix is :
>
> static int os_execute (lua_State *L) {
>   int rv = system(luaL_optstring(L, 1, NULL));
>   int exitCode = 0;
>   if (WIFEXITED(rv)) {
>  exitCode = WEXITSTATUS(rv);
>   }
>   lua_pushinteger(L, exitCode);
>   return 1;
> }
> (based on Lua 5.1.4, adapt slightly for Lua 5.2.1 which checks for a shell)
>
>

What's the other information returned by system() then? Maybe that
should still be given as an additional return value.

-- 
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