connlist.c File Reference

Functions to help search and maintain the connection list. These functions are thread-safe. More...

#include "connlist.h"
#include <pthread.h>
#include "debug.h"
#include <unistd.h>

Go to the source code of this file.

Functions
errorcode	connlist_init (connlist_t *list)
	the function to initialize the list
errorcode	connlist_add (connlist_t *list, connlist_item_t *item)
	the function to add an item to the list
errorcode	connlist_find (connlist_t *list, int(*func)(void *, void *), void *arg, connlist_item_t **found_item)
	finds an item in the list
int	connlist_find_pred_port (void *this_item, void *find_item)
	the function to find a predictied port match (used as a match function for the list implementation).
int	connlist_find_buddy (void *this_item, void *find_item)
	the function to find a buddy match (used as a match function for the list implementation).
errorcode	connlist_forget (connlist_t *list, int(*func)(void *, void *), connlist_item_t *item)
	the function to remove an item from the list
int	connlist_item_match (void *this_item, void *find_item)
	the matching function for an item in the list
int	connlist_count (connlist_t *list)
	gets the number of items in the list

---

Detailed Description

Functions to help search and maintain the connection list. These functions are thread-safe.

Author:

Daniel Ferullo (ferullo@cmu.edu)

Definition in file connlist.c.

---

Function Documentation

errorcode connlist_add (  connlist_t *  list, connlist_item_t *  item )

the function to add an item to the list This function is thread safe. forget must be called once for this function to remove the item from the list once it has been added. Parameters: list  pointer to the connlist_t list item  pointer to the item to add Returns: SUCCESS, errorcode on failure Definition at line 49 of file connlist.c. References CHECK_NOT_NULL, connlist_item_t, connlist_t, DBG_THREAD, DEBUG, ERROR_NULL_ARG_1, ERROR_NULL_ARG_2, errorcode, FAILED, connlist::list, list_add(), connlist::mutex, and connlist_item::watchers. Referenced by helper_fsm_start().

int connlist_count (  connlist_t *  list  )

gets the number of items in the list This function is thread safe Parameters: list  pointer to the connlist Returns: the number of elements, negative on error Definition at line 238 of file connlist.c. References CHECK_NOT_NULL, connlist_t, DBG_THREAD, DEBUG, connlist::list, list_count(), and connlist::mutex. Referenced by natblaster_server().

errorcode connlist_find (  connlist_t *  list, int(*)(void *, void *)  func, void *  arg, connlist_item_t **  found_item )

finds an item in the list This function is thread safe Parameters: list  pointer to the connlist_t list func  function pointer to use in find matching. Function must meet requirements specified for function list_find in list.h arg  the one optional argument passed into the func function found_item  pointer to a void* to fill in with the found item. On error this value is undefined. Returns: SUCCESS, errorcode on failure Definition at line 79 of file connlist.c. References CHECK_NOT_NULL, connlist_item_t, connlist_t, DBG_PORT_PRED, DBG_THREAD, DEBUG, ERROR_NULL_ARG_1, ERROR_NULL_ARG_2, ERROR_NULL_ARG_4, errorcode, FAILED, connlist::list, list_find(), connlist::mutex, and connlist_item::watchers. Referenced by find_conn2(), and get_buddy().

int connlist_find_buddy (  void *  this_item, void *  find_item )

the function to find a buddy match (used as a match function for the list implementation). Parameters: this_item  the item from the list to check (a connlist_item_t pointer) find_item  the values to match on (a buddy_info_t pointer) Returns: LIST_FATAL, LIST_FOUND, LIST_NOT_FOUND, as per requirements Definition at line 151 of file connlist.c. References buddy_info_t, CHECK_NOT_NULL, connlist_item_t, buddy_info::ext_ip, connlist_item::info, buddy_info::int_ip, buddy_info::int_port, peer_info::ip, observed_data::ip, LIST_FATAL, connlist_item::obs_data, helper_conn_info::peer, and peer_info::port. Referenced by get_buddy().

int connlist_find_pred_port (  void *  this_item, void *  find_item )

the function to find a predictied port match (used as a match function for the list implementation). Parameters: this_item  the item from the list to check (a connlist_item_t pointer) find_item  the values to match on (an observed_data_t pointer) Returns: LIST_FATAL, LIST_FOUND, LIST_NOT_FOUND, as per requirements Definition at line 121 of file connlist.c. References CHECK_NOT_NULL, connlist_item_t, DBG_IP, DBG_PORT, DBG_PORT_PRED, DEBUG, observed_data::ip, LIST_FATAL, connlist_item::obs_data, observed_data_t, and observed_data::port. Referenced by find_conn2().

errorcode connlist_forget (  connlist_t *  list, int(*)(void *, void *)  func, connlist_item_t *  item )

the function to remove an item from the list This function is thread safe. This function will only remove the item if there are no watchers left. It must be called exactly once for each time find is called, plus once more for the add call. Parameters: list  a pointer to the list to remove from func  the function to use in matching for the forget item  a pointer to the item to remove Returns: SUCCESS, errorcode on failure Definition at line 187 of file connlist.c. References CHECK_NOT_NULL, connlist_item_t, connlist_t, DBG_THREAD, DEBUG, ERROR_NULL_ARG_1, ERROR_NULL_ARG_2, errorcode, FAILED, connlist::list, list_remove(), connlist::mutex, and connlist_item::watchers. Referenced by helper_fsm_buddy_alloc(), helper_fsm_conn2(), and helper_fsm_start().

errorcode connlist_init (  connlist_t *  list  )

the function to initialize the list man page says return value is always 0, but I don't trust it, since the man page for pthreads also says some functions/macros exist that in fact do not. Definition at line 32 of file connlist.c. References CHECK_FAILED, CHECK_NOT_NULL, connlist_t, ERROR_INIT, ERROR_NULL_ARG_1, errorcode, connlist::list, list_init(), and connlist::mutex. Referenced by natblaster_server().

int connlist_item_match (  void *  this_item, void *  find_item )

the matching function for an item in the list Parameters: this_item  a pointer to the current item in the list (will be cast to a connlist_t pointer) find_item  a pointer to the item to find (will be cast to a connlist_item_t pointer) Returns: LIST_FATAL, LIST_FOUND, LIST_NOT_FOUND as list.h requires Definition at line 223 of file connlist.c. References CHECK_NOT_NULL, and LIST_FATAL. Referenced by helper_fsm_buddy_alloc(), helper_fsm_conn2(), and helper_fsm_start().

---