Date: Tue, 28 May 2013 12:25:04 GMT From: Serhii Kharchenko <harry@advancedhosters.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/179048: watch(8) doesn't stop listening TTY when user releases it Message-ID: <201305281225.r4SCP4j8029976@oldred.FreeBSD.org> Resent-Message-ID: <201305281230.r4SCU081030452@freefall.freebsd.org>
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>Number: 179048 >Category: kern >Synopsis: watch(8) doesn't stop listening TTY when user releases it >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue May 28 12:30:00 UTC 2013 >Closed-Date: >Last-Modified: >Originator: Serhii Kharchenko >Release: 9.1-RELEASE-p1 >Organization: AdvancedHosters >Environment: FreeBSD test-advancedhosters.com 9.1-RELEASE-p1 FreeBSD 9.1-RELEASE-p1 #1: Fri May 24 13:37:29 UTC 2013 root@test-advancedhosters.com:/usr/obj/usr/src/sys/Z-AMD64 amd64 >Description: When watch(8) is listening TTY and user stops using this TTY (e.g. closes SSH connection) - watch proceeds listening it. It does not exit and does not write that the session is ended. The same problem is observed when security/termlog is used. termlog also uses snp(4) device and it also does not stop listening released TTY. Looks that this problem appeared in FreeBSD-8 after pty(4) was replaced with pts(4) and snp(4) was completely rewritten. >How-To-Repeat: Just open 2 SSH sessions to the server: Session #1: root@test-advancedhosters:/root # tty /dev/pts/0 Session #2: root@test-advancedhosters:/root # watch /dev/pts/0 (and we see all the I/O of terminal /dev/pts/0) After logout of session #1 we see just "logout" word and watch proceeds listening. TTY device is present and it is disappear only after watch is killed: root@test-advancedhosters:/root # ps aux | grep watch | grep -v grep root 45903 0.0 0.0 12288 1940 1 I+ 12:11PM 0:00.00 watch /dev/pts/0 root@test-advancedhosters:/root # ls -la /dev/pts/0 crw-rw-rw- 1 root wheel 0, 67 May 28 12:13 /dev/pts/0 root@test-advancedhosters:/root # kill 45903 root@test-advancedhosters:/root # ls -la /dev/pts/0 ls: /dev/pts/0: No such file or directory >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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