From owner-freebsd-hackers  Sun Jun 10  5:56:54 2001
Delivered-To: freebsd-hackers@freebsd.org
Received: from dove.cc.ncu.edu.tw (dove.cc.ncu.edu.tw [140.115.17.111])
	by hub.freebsd.org (Postfix) with ESMTP id 1DDEE37B401
	for <hackers@FreeBSD.ORG>; Sun, 10 Jun 2001 05:56:31 -0700 (PDT)
	(envelope-from mihs@wmlab.csie.ncu.edu.tw)
Received: from mihs (mihs.wmlab.csie.ncu.edu.tw [140.115.156.42])
	by dove.cc.ncu.edu.tw (8.11.2/8.11.2/dove/0.0.4) with SMTP id f5ACxwn27999
	for <hackers@FreeBSD.ORG>; Sun, 10 Jun 2001 20:59:59 +0800 (CST)
Message-ID: <001901c0f1ac$cb716890$2a9c738c@mihs>
From: "Ming-I Hsieh" <mihs@wmlab.csie.ncu.edu.tw>
To: <hackers@FreeBSD.ORG>
Subject: a bug in ipfstream under FreeBSD 4.3-RELEASE?
Date: Sun, 10 Jun 2001 20:56:39 +0800
MIME-Version: 1.0
Content-Type: text/plain;
	charset="Windows-1252"
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2462.0000
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2462.0000
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG

In one case, I need to analyse the data flow of FreeBSD box. Therefore, I
uses ipfstream to get report from 'ipfw show'. After program runs several
days, I notes some odd number in kern.openfiles. I uses fstat to find out
what thing is happened. Then I find my program does *not* release the fd
after the ipfstream has droped. Now I uses popen and pclose to replace
ipfstream. It works fine. Anyone know what thing happens? Is it a bug for
pfstream? Or just my fault. The testing program is below. Thanks.

//--------------------------------------------------------------------------
-
// pfstream bug?
//--------------------------------------------------------------------------
-
#include <pfstream.h>
#include <iostream>
#include <sysexits.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

//--------------------------------------------------------------------------
-
int main(int argc, char ** argv)
{
        if (argc < 3) {
                cerr.form("Usage: %s trynum sleep_time\n", argv[0]);
                return EX_USAGE;
        }

        register int i = 0, iend = atoi(argv[1]);
        for (i = 0; i < iend; i++) {
                ipfstream pfin("|/bin/ls /bin", ios::in);
                char buffer[1024];
                // Read data from pfin
                while (pfin.getline(buffer, 1024)) {
                        // Do nothing.
                }
        }

        cout.form("Try \"fstat -p %d\"\n", getpid());
        cout.form("Ok! Go to Sleep. [%d sec]\n", atoi(argv[2]));
        sleep(atoi(argv[2]));

        return EX_OK;
}

//--------------------------------------------------------------------------
-



To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message