| SHMIF(4) | Device Drivers Manual | SHMIF(4) | 
shmif —
#include <rump/rump.h>
int
  
  rump_pub_shmif_create(const char
    *path, int *ifnum);
shmif interface uses a memory mapped regular file as
  a virtual Ethernet bus. All interfaces connected to the same bus see each
  others' traffic.
Using a memory mapped regular file as a bus has two implications:
It is not possible to directly access the host networking
    facilities from a rump kernel using purely shmif.
    However, traffic can be routed to another rump kernel instance which
    provides both shmif and
    virt(4) networking.
An shmif interface can be created in two
    ways:
rump_pub_shmif_create(). The bus pathname is
      passed in path. The number of the newly created
      interface is available after a successful call by dereferencing
      ifnum.Destroying an shmif interface is possible
    only via ifconfig(8)
    destroy.
An shmif interface emulates TX/RX offload
    options in software. They are specified by
    ifconfig(8). Alternatively,
    its if_capenable flag is directly specified by environment
    variable RUMP_SHMIF_CAPENABLE, for example:
See /usr/include/net/if.h for more details.
| December 12, 2018 | NetBSD 9.4 |