ref: db6883559fb0f243f94d0a2dfab75f866e651652
dir: /sys/src/9/ip/nullmedium.c/
#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" #include "ip.h" static void nullbind(Ipifc*, int, char**) { error("cannot bind null device"); } static void nullunbind(Ipifc*) { } static void nullbwrite(Ipifc*, Block *bp, int, uchar*, Routehint*) { freeb(bp); error("nullbwrite"); } Medium nullmedium = { .name= "null", .bind= nullbind, .unbind= nullunbind, .bwrite= nullbwrite, }; /* used in ipifc to prevent unbind while bind is in progress */ Medium unboundmedium = { .name= "unbound", .bind= nullbind, .unbind= nullunbind, .bwrite= nullbwrite, }; void nullmediumlink(void) { addipmedium(&nullmedium); }