Date: Sat, 31 Mar 2012 21:36:13 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Nicholas Wilson <nicholas@nicholaswilson.me.uk> Cc: "freebsd-x11@freebsd.org" <freebsd-x11@freebsd.org>, Andriy Gapon <avg@freebsd.org> Subject: Re: Working out which VT an X process is on Message-ID: <20120331183613.GO2358@deviant.kiev.zoral.com.ua> In-Reply-To: <CAN%2BZGEmuUSt-mn_FfHjCUAqaUiorrzhfOfNzVW9f9LsPTBwCLQ@mail.gmail.com> References: <CAN%2BZGEnicY-UOB-5LO%2BxiUZKFpf7bFyUe3fv5reGh24ntNTofA@mail.gmail.com> <4F76D0E9.7060006@FreeBSD.org> <CAN%2BZGEmuUSt-mn_FfHjCUAqaUiorrzhfOfNzVW9f9LsPTBwCLQ@mail.gmail.com>
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--PMKcwNXkopx7sVjc Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Mar 31, 2012 at 07:17:38PM +0100, Nicholas Wilson wrote: > On Mar 31, 2012 10:39 AM, "Andriy Gapon" <avg@freebsd.org> wrote: > > > > on 31/03/2012 04:10 Nicholas Wilson said the following: > > > Hello, > > > > > > I'm working at the moment on porting a VNC product to FreeBSD, and ha= ve > run > > > into a little problem which I hope I can get some help on. In brief: I > > > can't find a way of determining which virtual terminal is in use by a > given > > > X process. > > > > > > On linux, when X opens a handle to the tty it's going to run on, it > > > acquires it as a controlling terminal. So, if there are two X process= es, > > > and we see that tty7 and tty8 are in use, it's obvious from ps which > > > process is which, and hence by inspecting the processes' environments= we > > > can quickly establish which display number goes with which VT. (On the > > > other UNIX platforms we support, like AIX, we don't need to worry abo= ut > VTs > > > at all.) > > > > Not sure if there is a better way, but > > fstat -p ${X_SERVER_PID} | fgrep tty > > should give what you want. > > You need to have enough privileges to get information about the X proce= ss. > > > > -- > > Andriy Gapon >=20 > Oh! That makes it look so obvious. I'd been fixated on the fact that we > can't rely on proc on BSD, so fuser wouldn't work like does on linux. Of > couse there must be a sysctl-based equivalent for getting the X process's > fds! I'm sure I can work it out now. The sysctl you are looking for is kern.proc.filedesc. See lib/libutil/kinfo_getfile.c for sample use, or just use kinfo_getfile() as is. On the other hand, there may be more ttys opened then just VT which is used for framebuffer, and even more then VT + ctty. --PMKcwNXkopx7sVjc Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk93Tp0ACgkQC3+MBN1Mb4iHbQCg9OAVSfyjHR1RGy+1RMEbE099 O+MAn21BFglD4VQffPHn6zx67bIfckML =7T2V -----END PGP SIGNATURE----- --PMKcwNXkopx7sVjc--
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