From: Chris Atenasio <chrisa@ultranet.com>
To: Amol Mohite <amol@m-net.arbornet.org>
Cc: ralf@uni-koblenz.de, linux-mm@kvack.org
Subject: Re: Somw questions [ MAYBE OFFTOPIC ]
Date: Fri, 2 Apr 1999 13:56:39 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.05.9904021353340.18457-100000@chris.atenasio.net> (raw)
In-Reply-To: <19990402113555.F9584@uni-koblenz.de>
> A NULL pointer is just yet another invalid address. There is no special
> test for a NULL pointer. Most probably for example (char *)0x12345678 will
> be invalid as a pointer as well and treated the same. The CPU detects this
> when the TLB doesn't have a translation valid for the access being attempted.
Which is why you can do -=*fun*=- things such as:
fd = open("/dev/kmem", O_RDWR);
mmap(0,64000,PROT_READ|PROT_WRITE,MAP_SHARED|MAP_FIXED,fd,0xB8000);
:) ^ ^^^^^^^^^
- Chris
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next prev parent reply other threads:[~1999-04-02 18:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-04-01 9:16 Amol Mohite
1999-04-02 9:35 ` ralf
1999-04-02 18:56 ` Chris Atenasio [this message]
1999-04-05 9:12 ` Amol Mohite
1999-04-06 10:55 ` ralf
1999-04-06 22:51 ` Stephen C. Tweedie
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