*nix Documentation Project
·  Home
 +   man pages
·  Linux HOWTOs
·  FreeBSD Tips
·  *niX Forums

  man pages->NetBSD man pages -> kvm (3)              



NAME    [Toc]    [Back]

     kvm - kernel memory interface

LIBRARY    [Toc]    [Back]

     Kernel Data Access Library (libkvm, -lkvm)

DESCRIPTION    [Toc]    [Back]

     The kvm(3) library provides a uniform interface for accessing kernel virtual
 memory images, including live systems and crashdumps.  Access to
     live systems is via /dev/mem while crashdumps can be examined via the
     core file generated by savecore(8).  The interface behaves identically in
     both cases.  Memory can be read and written, kernel symbol addresses can
     be looked up efficiently, and information about user processes can be

     kvm_open() is first called to obtain a descriptor for all subsequent

COMPATIBILITY    [Toc]    [Back]

     The kvm interface was first introduced in SunOS.  A considerable number
     of programs have been developed that use this interface, making backward
     compatibility highly desirable.  In most respects, the Sun kvm interface
     is consistent and clean.  Accordingly, the generic portion of the interface
 (i.e., kvm_open(), kvm_close(), kvm_read(), kvm_write(), and
     kvm_nlist()) has been incorporated into the BSD interface.  Indeed, many
     kvm applications (i.e., debuggers and statistical monitors) use only this
     subset of the interface.

     The process interface was not kept.  This is not a portability issue
     since any code that manipulates processes is inherently machine dependent.

     Finally, the Sun kvm error reporting semantics are poorly defined.  The
     library can be configured either to print errors to stderr automatically,
     or to print no error messages at all.  In the latter case, the nature of
     the error cannot be determined.  To overcome this, the BSD interface
     includes a routine, kvm_geterr(3), to return (not print out) the error
     message corresponding to the most recent error condition on the given

SEE ALSO    [Toc]    [Back]

     kvm_close(3), kvm_getargv(3), kvm_getenvv(3), kvm_geterr(3),
     kvm_getloadavg(3), kvm_getprocs(3), kvm_nlist(3), kvm_open(3),
     kvm_openfiles(3), kvm_read(3), kvm_write(3)

BSD                              June 4, 1993                              BSD
[ Back ]
 Similar pages
Name OS Title
kmem Tru64 mapped kernel memory interface
dontdump HP-UX defines which classes of kernel memory pages are not dumped when a kernel panic occurs
alwaysdump HP-UX defines which classes of kernel memory pages are dumped when a kernel panic occurs
free OpenBSD kernel memory allocator
malloc_roundup NetBSD kernel memory allocator
FREE NetBSD kernel memory allocator
MALLOC NetBSD kernel memory allocator
malloc NetBSD kernel memory allocator
MALLOC OpenBSD kernel memory allocator
free NetBSD kernel memory allocator
Copyright © 2004-2005 DeniX Solutions SRL
newsletter delivery service