<dec f='src/src/sys/sys/callback.h' l='57' type='void callback_register(struct callback_head * , struct callback_entry * , void * , int (*)(struct callback_entry *, void *, void *) )'/>
<def f='src/src/sys/kern/subr_callback.c' l='61' ll='73' type='void callback_register(struct callback_head * ch, struct callback_entry * ce, void * obj, int (*)(struct callback_entry *, void *, void *) fn)'/>
