X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-1.2 required=5.0	tests=AWL,BAYES_50,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,T_TO_NO_BRKTS_FREEMAIL
X-Spam-Check-By: sourceware.org
MIME-Version: 1.0
In-Reply-To: <4E2089CB.4090608@valdetaro.com>
References: <4E2089CB DOT 4090608 AT valdetaro DOT com>
Date: Fri, 15 Jul 2011 20:22:05 +0100
Message-ID: <CAHWeT-YjNzYf+Lv3gwjy1WxcJZTUBpFcZE+VGD1hMm=2yFifkA@mail.gmail.com>
Subject: Re: popen () fails when running from the windows prompt
From: Andy Koppe <andy DOT koppe AT gmail DOT com>
To: cygwin AT cygwin DOT com
Content-Type: text/plain; charset=UTF-8
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id p6FJMO7o014841

On 15 July 2011 19:41, Luiz Claudio Valdetaro wrote:
> i,
>
> I am planning a minimalistic installation of my application using cygwin.
> Everything works fine, except that popen() fails when running from the
> windows prompt.
>
> If I ran from the bash shell prompt of cygwin , it works fine. It is the
> only api I use that is failing. I created a simple, test program to narrow
> the issue,  and it also fails.
>
> my intention is an installation with just my app, plus the cygwin.dll, as
> little files as possible.
>
> This is my test program:
>
> main (argc,argv)
> int argc;
> unsigned char *argv[];
> {
> FILE *f;
> char command[80]="ls -l CGI-BIN";
> char response[200];
>    f = popen (command,"r");
>    if (f == NULL) {
>       puts ("stream error");
>       exit (0);
>    }
>     while (fgets(response,199,f) != NULL) {
>        puts (response);
>     }
>   fclose (f);
> }
>
> The program allays fails printing "stream error"

It's because popen() requires /bin/sh.

Andy

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple