Date: Wed, 18 Dec 1996 13:06:11 -0800 From: Amancio Hasty <hasty@rah.star-gate.com> To: Terry Lambert <terry@lambert.org> Cc: hackers@freebsd.org, multimedia@freebsd.org Subject: Re: mmap problems? Message-ID: <199612182106.NAA06275@rah.star-gate.com> In-Reply-To: Your message of "Wed, 18 Dec 1996 14:01:51 MST." <199612182101.OAA10384@phaeton.artisoft.com>
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>From The Desk Of Terry Lambert :
> > I have an old program "tv" which used to work okay.
> >
> > frame_size = 38896;
> > if ((video = open("/dev/meteor0", O_RDONLY)) < 0) {
> > fprintf(stderr, "open failed: %s\n", strerror(errno));
> > exit(1);
> > }
> >
> > After running the program several times, tv exits with a a memory access
> > violation. It looks like the system is not
> > giving me access to the last page of the frame buffer. Any hints?
>
> Look at the meteor driver; the page range limitation is imposed at
> that level.
>
>
> Terry Lambert
> terry@lambert.org
> ---
Hi,
I am a little confuse . Why would "tv" work 3 or 5 times then fail to run
because the driver did not mmap properly the pages?
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