The Design and Implementation of the Anykernel and Rump Kernels

A–29
RUMPCLIENT(3) NetBSD Library Functions Manual RUMPCLIENT(3)
rumpclient_vfork()
Like above, but the host uses vfork(2).
rumpclient_prefork()
Low-level routine which instructs the rump kernel that the current
process is planning to fork. The routine returns a non-NULL cookie
if successful.
rumpclient_fork_init(rfp)
Low-level routine which works like rumpclient_init(), with the
exception that it uses the rfp context created by a call to
rumpclient_prefork(). This is typically called from the child of a
fork(2) call.
rumpclient_fork_cancel(rfp)
Cancel previously initiated prefork context. This is useful for
error handling in case a full fork could not be carried through.
rumpclient_exec(path, argv, envp)
This call is a rumpclient wrapper around execve(2). The wrapper
makes sure that the rump kernel process context stays the same in
the newly executed program. This means that the rump kernel PID
remains the same and the same rump file descriptors are available
(apart from ones which were marked with FD_CLOEXEC).
It should be noted that the newly executed program must call
rumpclient_init() before any other rump kernel communication can
take place. The wrapper cannot do it because it no longer has program
control. However, since all rump clients call the init routine,
this should not be a problem.
NetBSD 5.99.48 February 16, 2011 NetBSD 5.99.48