From owner-freebsd-hackers@FreeBSD.ORG  Wed Apr 13 18:30:41 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 6C32716A4CE
	for <freebsd-hackers@freebsd.org>;
	Wed, 13 Apr 2005 18:30:41 +0000 (GMT)
Received: from hotmail.com (bay10-f2.bay10.hotmail.com [64.4.37.2])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 417D943D1F
	for <freebsd-hackers@freebsd.org>;
	Wed, 13 Apr 2005 18:30:41 +0000 (GMT)
	(envelope-from ghanekar_rajesh@hotmail.com)
Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC;
	 Wed, 13 Apr 2005 11:30:41 -0700
Message-ID: <BAY10-F2509CF7C63C73C1281BD28A340@phx.gbl>
Received: from 202.54.11.72 by by10fd.bay10.hotmail.msn.com with HTTP;
	Wed, 13 Apr 2005 18:30:40 GMT
X-Originating-IP: [202.54.11.72]
X-Originating-Email: [ghanekar_rajesh@hotmail.com]
X-Sender: ghanekar_rajesh@hotmail.com
From: "Rajesh Ghanekar" <ghanekar_rajesh@hotmail.com>
To: freebsd-hackers@freebsd.org
Date: Thu, 14 Apr 2005 00:00:40 +0530
Mime-Version: 1.0
Content-Type: text/plain; format=flowed
X-OriginalArrivalTime: 13 Apr 2005 18:30:41.0164 (UTC)
	FILETIME=[E57FA4C0:01C54056]
Subject: not able to  get controlling tty
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 13 Apr 2005 18:30:41 -0000

Hi,

   I have a program which prints the name of the controlling terminal. The 
code snippet is as
follows:

int main(int argc, char **argv)
{
        int mib[4], len;
        struct kinfo_proc buf;
        udev_t ttydev;
        register struct dirent *dirp;
        register DIR *dp;
        struct stat dsb;
        char namebuf[sizeof(PATH_DEV) + MAXNAMLEN];

        mib[0] = CTL_KERN;
        mib[1] = KERN_PROC;
        mib[2] = KERN_PROC_PID;
        mib[3] = getpid();
        len = sizeof (buf);
        sysctl(mib, 4, &buf, &len, NULL, 0);
        ttydev = buf.kp_eproc.e_tdev;
        printf("ttydev is %u, major = %d, minor = %d\n", ttydev, 
major(ttydev), minor(ttydev));

        if (!(dp = opendir(PATH_DEV)))
                return 1;
        strlcpy(namebuf, PATH_DEV, sizeof(PATH_DEV));
        while ((dirp = readdir(dp))) {
                memset(namebuf + sizeof(PATH_DEV) - 1, '\0',
                        MAXNAMLEN - sizeof(PATH_DEV) + 1);
                memcpy(namebuf + sizeof(PATH_DEV) - 1, dirp->d_name,
                    dirp->d_namlen + 1);
                if (stat(namebuf, &dsb) || (dsb.st_rdev != ttydev))
                        continue;
                printf("OK found\n");
                break;
        }
}

The value returned by buf.kp_eproc.e_tdev doesn't seems to be right.

#/tmp/abc
ttydev is 30479, major = 119, minor = 15
Device name is /dev/log
# /tmp/abc
ttydev is 30577, major = 119, minor = 113
Device name is /dev/log

ttydev keeps on changing every time I run same program on same terminal.
Is there any way to get terminal device (udev_t) from struct kinfo_proc?


- Rajesh

_________________________________________________________________
Marriages at Bharatmatriony.com 
http://www.bharatmatrimony.com/cgi-bin/bmclicks1.cgi?74 Relationships that 
last forever