kmem(7)                          DG/UX R4.11                         kmem(7)


NAME
       kmem - kernel logical memory

DESCRIPTION
       Kmem is a character special pseudo-device that provides access to
       kernel logical memory for direct reading and writing.  The file
       pointer is treated as a logical address within kernel logical memory.

       For the open and close system calls, user visible functionality is
       the same as for an ordinary disk file.

       With the read system call, the contents of the kernel logical memory
       at the address contained in the file  pointer are transferred into
       the caller's buffer.  If any part of the requested data would be out
       of kernel logical memory, no data is transferred and the error ENXIO
       is returned.  If any part of the requested data is inaccessible
       because of not being memory resident, an implementation may transfer
       no data and return the error ENXIO.  No guarantees of consistency are
       made; the kernel memory being read may change while the read is in
       progress.

       With the write system call, the contents of caller's buffer are
       transferred into the kernel logical memory at the address contained
       in the file pointer.  If the write call would attempt to transfer
       data to locations out of the kernel logical memory, no data will be
       transferred and the error ENXIO will be returned.  If the write call
       would attempt to transfer data to locations that are inaccessible
       because of not being memory resident, an implementation may transfer
       no data and return the error ENXIO.  Correct operation of the system
       is not guaranteed after kernel memory has been modified with this
       call.

       Select always returns READY for both read and write operations.

       There are no ioctl system calls specific to the character special
       device kmem. Other ioctl calls that apply to ordinary disk files also
       apply to kmem.

FILES
       /dev/kmem

SEE ALSO
       mem(7).


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