full(4) [linux man page]

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

NAME

       full - always full device

CONFIGURATION

       If your system does not have /dev/full created already, it can be created with the following commands:

	       mknod -m 666 /dev/full c 1 7
	       chown root:root /dev/full

DESCRIPTION

       File /dev/full has major device number 1 and minor device number 7.

       Writes to the /dev/full device will fail with an ENOSPC error.  This can be used to test how a program handles disk-full errors.

       Reads from the /dev/full device will return  characters.

       Seeks on /dev/full will always succeed.

FILES

       /dev/full

SEE ALSO

       mknod(1), null(4), zero(4)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2007-11-24								   FULL(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 example, to examine (and even
       patch) the system.

       Byte addresses in mem are interpreted as physical memory addresses.  References to nonexistent 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:kmem /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:kmem /dev/kmem

       port is similar to mem, but the I/O 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)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    1992-11-21								    MEM(4)