69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
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/*
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* (C)opyright 1993,1994,1995 by Darren Reed.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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/*
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* kmemcpy() - copies n bytes from kernel memory into user buffer.
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* returns 0 on success, -1 on error.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/file.h>
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#define KMEM "/dev/kmem"
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#if !defined(lint) && defined(LIBC_SCCS)
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static char sccsid[] = "@(#)kmem.c 1.4 1/12/96 (C) 1992 Darren Reed";
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static char rcsid[] = "$Id: kmem.c,v 2.0.1.1 1997/01/09 15:14:44 darrenr Exp $";
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#endif
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static int kmemfd = -1;
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int openkmem()
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{
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if ((kmemfd = open(KMEM,O_RDONLY)) == -1)
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{
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perror("kmeminit:open");
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return -1;
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}
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return kmemfd;
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}
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int kmemcpy(buf, pos, n)
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register char *buf;
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long pos;
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register int n;
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{
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register int r;
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if (!n)
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return 0;
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if (kmemfd == -1)
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if (openkmem() == -1)
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return -1;
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if (lseek(kmemfd, pos, 0) == -1)
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{
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perror("kmemcpy:lseek");
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return -1;
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}
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while ((r = read(kmemfd, buf, n)) < n)
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if (r <= 0)
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{
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perror("kmemcpy:read");
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return -1;
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}
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else
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{
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buf += r;
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n -= r;
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}
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return 0;
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}
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