Date: Tue, 17 Aug 2010 00:09:23 +0200 From: David DEMELIER <demelier.david@gmail.com> To: Roland Smith <rsmith@xs4all.nl> Cc: freebsd-questions@freebsd.org Subject: Re: watch(8) does not work in jails Message-ID: <AANLkTiku2SzjSVrSj3eZJnoY0dwbX4piKwOZ6R5ieoes@mail.gmail.com> In-Reply-To: <20100816181703.GB66710@slackbox.erewhon.net> References: <AANLkTikPvVqcOAdk3EJBmmP-6_AkFs-TuQnNqbi2r=Vr@mail.gmail.com> <20100816181703.GB66710@slackbox.erewhon.net>
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2010/8/16 Roland Smith <rsmith@xs4all.nl>: > On Mon, Aug 16, 2010 at 11:23:00AM +0200, David DEMELIER wrote: >> Hi, >> >> I enabled `device snp' in my kernel config file and with this I can >> use the command watch(8) to see any tty device attached. For example : >> >> # watch ttyv0 >> >> Give me the output of the console. >> >> But in jails, it's not the same thing, I tried the following : >> >> # jexec 1 tcsh >> # su - >> People# watch pts/0 >> watch: fatal: cannot open snoop device >> >> Is there a limitation of watch(8), or jails ? > > Does /dev/pts/0 actually exist in the jail's devfs instance, and are its > permissions correct? > (In jail) : # ls -l /dev/pts/* crw--w---- 1 markand tty 0, 94 17 Aug 00:06 /people/dev/pts/0 crw--w---- 1 markand tty 0, 96 17 Aug 00:06 /people/dev/pts/1 crw--w---- 1 root tty 0, 101 21 Jul 00:07 /people/dev/pts/2 crw--w---- 1 markand tty 0, 108 17 Aug 00:06 /people/dev/pts/3 crw--w---- 1 markand tty 0, 99 16 Aug 01:28 /people/dev/pts/4 crw--w---- 1 markand tty 0, 112 17 Aug 00:05 /people/dev/pts/5 crw--w---- 1 root tty 0, 111 17 Aug 00:06 /people/dev/pts/6 crw--w---- 1 root tty 0, 114 16 Aug 23:53 /people/dev/pts/7 crw--w---- 1 root tty 0, 100 17 Aug 00:06 /people/dev/pts/8 I don't understand why pts/0 is given to me since on the host I don't have = it : (On host) : markand@Orange ~ $ who markand pts/6 16 Aug 23:57 (192.168.1.20) markand pts/7 16 Aug 23:52 (192.168.1.20) markand pts/8 17 Aug 00:06 (192.168.1.20) markand pts/9 17 Aug 00:06 (192.168.1.20) But in the jail pts/0 is affected to a completely different user. I'm confused. > Roland > -- > R.F.Smith =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 http://www.xs4all.n= l/~rsmith/ > [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] > pgp: 1A2B 477F 9970 BA3C 2914 =C2=A0B7CE 1277 EFB0 C321 A725 (KeyID: C321= A725) > --=20 Demelier David
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