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Copyright (c) 2012 Joyent, Inc. All Rights Reserved
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hook_t - callback structure for subscribing to netinfo events

#include <sys/hook.h>

illumos DDI specific (illumos DDI). The hook_t data structure defines a callback that is to be inserted into a networking event. This data structure must be allocated with a call to hook_alloc() and released with a call to hook_free().

hook_func_t h_func; /* callback function to invoke */
char *h_name; /* unique name given to the hook */
int h_flags;
hook_hint_t h_hint; /* insertion hint type */
uintptr_t h_hintvalue; /* used with h_hint */
void *h_arg; /* value to pass into h_func */

typedef int (*hook_func_t)(net_event_t token, hook_data_t info,
 void *);

The value returned by the hook_func_t function indicates whether or not the packet should still be considered valid. If the callback function has modified the packet in such a way that it should no longer be processed or considered valid, e.g. called freemsg(9F), then the callback should return 1. Otherwise it should return 0. Hook hints are hints that are used at the time of insertion and are not rules that enforce where a hook lives for its entire lifetime on an event. The valid values for the h_hint field are: HH_NONE HH_FIRST HH_LAST HH_BEFORE HH_AFTER See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Committed

netinfo (9F)