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Date: Sat, 18 Sep 2004 13:36:08 +0300
From: "Eli Zaretskii" <eliz AT gnu DOT org>
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To: djgpp AT delorie DOT com
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In-reply-to: <414B48C0.1B6F801F@yahoo.com> (message from CBFalconer on Fri, 17
	Sep 2004 20:41:41 GMT)
Subject: Re: calling unzip32 from C program
References: <ciesel$60c$1 AT nsnmpen3-gest DOT nuria DOT telefonica-data DOT net> <2r0dd4F14ift1U1 AT uni-berlin DOT de> <414B140F DOT 98A3CCF4 AT yahoo DOT com> <cif8uk$hh2$1 AT nsnmpen3-gest DOT nuria DOT telefonica-data DOT net> <414B48C0 DOT 1B6F801F AT yahoo DOT com>
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> From: CBFalconer <cbfalconer AT yahoo DOT com>
> Date: Fri, 17 Sep 2004 20:41:41 GMT
> 
> > I could find a more simple solution, like using another unzip
> > program (I have tried an old PKUNZIP.EXE that works fine), but
> > the point is to know what is failing here.
> 
> The failure is the use of "system()".

Actually, there's no failure I can see here at all.

> In C the return only says
> whether or not some shell was successfully called, and has nothing
> to do with whether the shell succeeded in executing the command.

Actually, the C9x spec says that the return value is ``impementation
defined'', while the Posix spec says that the return value is the exit
status of the command language interpreter, not just whether it
succeeded in executing the command.

In DJGPP, we tried to emulate a smarter shell whose exit status is the
same as the exit status of the command it invoked, and to be
compatible with Posix.