The Design and Implementation of the Anykernel and Rump Kernels

A–50
RUMP_SP(7) NetBSD Miscellaneous Information Manual RUMP_SP(7)
NAME
rump_sp -- rump remote system call support
DESCRIPTION
The rump_sp facility allows clients to attach to a rump kernel server
over a socket and perform system calls. While making a local rump system
call is faster than calling the host kernel, a remote system call over a
socket is slower. This facility is therefore meant mostly for operations
which are not performance critical, such as configuration of a rump kernel
server.
Clients
The NetBSD base system comes with multiple preinstalled clients which can
be used to configure a rump kernel and request diagnostic information.
These clients run as hybrids partially in the host system and partially
against the rump kernel. For example, network-related clients will typically
avoid making any file system related system calls against the rump
kernel, since it is not guaranteed that a rump network server has file
system support. Another example is DNS: since a rump server very rarely
has a DNS service configured, host networking is used to do DNS lookups.
Some examples of clients include rump.ifconfig which configures interfaces,
rump.sysctl which is used to access the sysctl(7) namespace and
rump.traceroute which is used to display a network trace starting from
the rump kernel.
Also, almost any unmodified dynamically linked application (for example
telnet(1) or ls(1)) can be used as a rump kernel client with the help of
system call hijacking. See rumphijack(3) for more information.
Connecting to the server
NetBSD 5.99.48 February 7, 2011 NetBSD 5.99.48