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Message-ID: <398FD5CC.38E3715C@ision.net>
Date: Tue, 08 Aug 2000 11:41:32 +0200
From: Benjamin Riefenstahl <Benjamin DOT Riefenstahl AT ision DOT net>
Organization: ISION Internet AG
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To: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: System call
References: <F68EqPeQ1qV94h4Jzgi0000240a AT hotmail DOT com> <200008071421 DOT KAA02793 AT envy DOT delorie DOT com> <20000807161543 DOT G12330 AT cygnus DOT com> <398F32A3 DOT 12530BE4 AT veritas DOT com>
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Hi Bob,


Bob McGowan wrote:
> /* `dir', `vdir' and `ls' directory listing programs for GNU.
>    Copyright (C) 85, 88, 90, 91, 95, 1996 Free Software Foundation, Inc.
> [...]
> Perhaps this is the source of some of the confusion?

Part of it probably.  Another is the definition of the system() function
most likely.

It's supposed to call the system shell for processing of it's argument. 
Now for Cygwin this would be "/bin/sh -c", naturally.  For VC++,
Borland, Metrowerks or any other straight Windows compiler the system
shell should be "%COMSPEC% /c".  So for any newby coming from a Windows
background and trying Cygwin, it's kind of mysterious at first, why
system("dir") works in VC++, and not in Cygwin.

Basically, the system() functions is highly specific to the compiler and
environment.  This goes so far that some Macintosh compilers implement
it with a simple "return NULL;", with the reasoning that there *is* no
shell on MacOS to call.


so long, benny
-- 
ISION Internet AG
Benjamin Riefenstahl
mailto:benjamin DOT riefenstahl AT ision DOT net

Ruhrstrasse 61
D-22761 Hamburg
http://www.ision.net

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