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Conference turris::digital_unix

Title:	DIGITAL UNIX(FORMERLY KNOWN AS DEC OSF/1)
Notice:	Welcome to the Digital UNIX Conference
Moderator:	SMURF::DENHAM

Created:	Thu Mar 16 1995
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	10068
Total number of notes:	35879

8601.0. "Pseudo TTY to Socket information" by MARVIN::GOUGH (Raoul Gough) Mon Jan 27 1997 12:50

Hello,

Can anybody suggest how to identify the socket that's connected to a pseduo-
tty device?

ie.

$ who
myname      ttyp0       Jan 16 13:03         
theirname   ttyp1       Jan 16 13:04         
yourname    ttyp2       Jan 17 06:52         

$ netstat
Active Internet connections
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp        0      0  leslie.telnet          dhcpar1a.1028          ESTABLISHED
tcp        0      0  leslie.telnet          gimli.1110             ESTABLISHED
tcp        0      0  leslie.telnet          andrew.2598            ESTABLISHED

But which one is which?  How about xterms as well? (coming in on the .exec
port instead of .telnet)

Thanks,
Ray.

T.R	Title	User	Personal Name	Date	Lines
8601.1		SMURF::MENNER	it's just a box of Pax..	`Mon Jan 27 1997 13:19`	6
	A sockets are not directly connected to pseudo terminals. The marriage happens in user space by a controlling process (e.g., telnetd) which has both a network stream (i.e., a socket open) and a master pty. The process reads from the socket and writes to the master (and vide versa). Finding which process has the socket and which has what master pty is non trival.
8601.2	File usage available, how bout the socket?	MARVIN::GOUGH	Raoul Gough	`Mon Jan 27 1997 14:38`	11
	Thanks for the response, <<< Note 8601.1 by SMURF::MENNER "it's just a box of Pax.." >>> I've tried using fuser.c (see note 4183.2), which can identify the processes using the /dev/ttyp.. pseudo device. Is there any way to see the PIDs using a socket? I've got a bad feeling that it's one of those "Use kdbx" things. Thanks, Ray.
8601.3		KITCHE::schott	Eric R. Schott USG Product Management	`Mon Jan 27 1997 17:27`	4
	lsof ? http://www-unix.zk3.dec.com/tuning/tools/tools.html
8601.4	lsof is cool	MARVIN::GOUGH	Raoul Gough	`Tue Jan 28 1997 04:51`	19
	Re:<<< Note 8601.3 by KITCHE::schott "Eric R. Schott USG Product Management" >>> Thanks Eric, lsof does the job alright. The only tricky bit is finding the controlling process on the ttyp.. device and then looking at all the other files that the process also has open. More than one of them (?) is the socket connection, which is nicely listed with it's remote end identified. Might be more than one copy of the socket because the xterm has done some dup(2) with it or something. Anyway, lsof does just what I wanted. Regards, Ray.
8601.5	What about finger	NETRIX::"[email protected]"	marvin::gough	`Tue Feb 11 1997 11:57`	17
	Well, I should probably have entered the request in a unix_beginners conference, because finger gives me the information I wanted: $ finger gough Login name: gough In real life: Ray Gough Directory: /usr/users/gough Shell: /usr/bin/ksh On since Feb 11 10:20:07 on ttyr1 from andmen No Plan. It doesn't say which socket from the remote host, but at least it gives the host name. Apologies for the mis-posting, Ray [Posted by WWW Notes gateway]