Date: Tue, 15 May 2001 01:38:25 -0700 From: Peter Wemm <peter@wemm.org> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Brian Somers <brian@Awfulhak.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/fs/devfs devfs_vnops.c Message-ID: <20010515083825.1339C380E@overcee.netplex.com.au> In-Reply-To: <30165.989915130@critter>
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Poul-Henning Kamp wrote:
> In message <200105150007.f4F077515172@hak.lan.Awfulhak.org>, Brian Somers wri
te
> s:
> >> phk 2001/05/14 01:20:47 PDT
> >>
> >> Modified files:
> >> sys/fs/devfs devfs_vnops.c
> >> Log:
> >> After a successfull poll of the cloning functions, match on the
> >> returned dev_t rather than the original name.
> >>
> >> This allows cloning from one name to another which is useful for
> >> /dev/tty and later for the pty's.
> >>
> >> Revision Changes Path
> >> 1.23 +7 -15 src/sys/fs/devfs/devfs_vnops.c
> >
> >Does this mean that I can catch ``open("/dev/tun")'' and clone (say)
> >/dev/tun100, returning that ?
>
> yes :-)
>
> We need a generic ioctl which returns the name of the device, so that
> we don't have weeds doing that by examining minor numbers popping up
> all over the place, but otherwise: have at it :-)
See libc:devname()
char *
devname(dev, type)
{
static char buf[SPECNAMELEN + 1];
...
j = sizeof(buf);
i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev));
if (i == 0)
return buf;
}
ie: it already exists, and I think you even were the one to write it..
Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
"All of this is for nothing if we don't go to the stars" - JMS/B5
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