Date: Thu, 24 Jul 2003 10:28:10 +0200 From: Pawel Jakub Dawidek <nick@garage.freebsd.pl> To: Julian Elischer <julian@elischer.org> Cc: freebsd-current@freebsd.org Subject: Re: fuword(), suword(), etc. Message-ID: <20030724082810.GV43543@garage.freebsd.pl> In-Reply-To: <Pine.BSF.4.21.0307231441410.60197-100000@InterJet.elischer.org> References: <Pine.BSF.4.21.0307231441410.60197-100000@InterJet.elischer.org>
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On Wed, Jul 23, 2003 at 02:48:41PM -0700, Julian Elischer wrote:
+> I'd like to have a "suptr and fuptr" to be able to save and read
+> user pointers in a "machine independent" manner..
+> at the moment ia need to know the size of a pointer and select the
+> appropriate 32 or 64 version.. It would jus tbe another ENTRY files in=
=20
+> support.[sS] alongside teh appropriate sized entry
+> for each architecture so it wouldn't 'cost' anything..
+>=20
+> for i386 it would be an alternate name for fuword32() and suword32()
+> I'm not sure what it would be on other architectures....
+>=20
+> comments?
Yes, good idea. I'm using for now something like this:
static __inline void *
fuptr(void *uaddr)
{
void *ptr;
if (copyin(uaddr, &ptr, sizeof(void *)) !=3D 0)
return ((void *)-1);
return (ptr);
}
For numbers is always better to use copyin(9)/copyout(9). Functions
like fubyte(9), etc. make no sens for me. -1 is returned on error or
if there is really -1, so one isn't able to find out if there is an
error or not.
--=20
Pawel Jakub Dawidek pawel@dawidek.net
UNIX Systems Programmer/Administrator http://garage.freebsd.pl
Am I Evil? Yes, I Am! http://cerber.sourceforge.net
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