Re^4: system and $?

You have a broken Perl if that's true.

Well, it's pretty easy to reproduce, and the effect is the same in ActiveState 5.8.8 und 5.10. If I find the time, I'll try it with Strawberry...

The shell cannot possibly change the parent's errno.

Certainly not. It would need to communicate the information in a different way to the parent process. Well, this is a theoretical question, because Perl - likely in order to be portable - is not programmed that way, but: If it would be possible on Windows to somehow get the full (i.e. 32 Bit) Exitcode, we could use this information: If the shell can't execute a program, it sets this exitcode to 9009.

OTOH, this would still make it indistinguishable from a program which deliberately sets that exit code..

--
Ronald Fischer <ynnor@mm.st>

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Re^5: system and $? by ikegami (Patriarch) on Aug 26, 2009 at 14:22 UTC
Well, it's pretty easy to reproduce, and the effect is the same in ActiveState 5.8.8 und 5.10. I used ActivePerl 5.10.0 b1005 above. 5.8.8 gives the same result. Both successfully execute the shell, so `$?` is not `-1`, so `$!` is meaningless. OTOH, this would still make it indistinguishable from a program which deliberately sets that exit code.. Yes.	[reply] [d/l] [select]