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RedHat 9 (Linux i386) - man page for port (redhat section 4)

MEM(4)					      Linux Programmer's Manual 				       MEM(4)

NAME
mem, kmem, port - system memory, kernel memory and system ports
DESCRIPTION
Mem is a character device file that is an image of the main memory of the computer. It may be used, for exam- ple, to examine (and even patch) the system. Byte addresses in mem are interpreted as physical memory addresses. References to non-existent locations cause errors to be returned. Examining and patching is likely to lead to unexpected results when read-only or write-only bits are present. It is typically created by: mknod -m 660 /dev/mem c 1 1 chown root:mem /dev/mem The file kmem is the same as mem, except that the kernel virtual memory rather than physical memory is accessed. It is typically created by: mknod -m 640 /dev/kmem c 1 2 chown root:mem /dev/kmem Port is similar to mem, but the IO ports are accessed. It is typically created by: mknod -m 660 /dev/port c 1 4 chown root:mem /dev/port
FILES
/dev/mem /dev/kmem /dev/port
SEE ALSO
chown(1), mknod(1), ioperm(2) Linux 1992-11-21 MEM(4)


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