NAME

       libwget-dns-caching - DNS caching

SYNOPSIS

   Functions
       void wget_dns_cache_init (void)
       void wget_dns_cache_exit (void)
       struct addrinfo * wget_dns_cache_get (const char *host, uint16_t port)
       struct addrinfo * wget_dns_cache_add (const char *host, uint16_t port, struct addrinfo
           *addrinfo)
       void wget_dns_cache_free (void)

Detailed Description

       DNS cache management functions.

Function Documentation

   void wget_dns_cache_init (void)
       Initialize the internal mutex needed for thread-safety operations on the cache entry
       container (hashmap). If you don't use multi-threading, you don't have to call this
       function.

       The initialization is normally automatically during library construction. But some systems
       doesn't support library constructors, also static linking doesn't do. That's where this
       function is needed.

   void wget_dns_cache_exit (void)
       Free the internal mutex allocated by wget_dns_cache_init().

   struct addrinfo* wget_dns_cache_get (const char * host, uint16_t port)
       Parameters
           host Hostname to look up
           port Port to look up

       Returns
           The cached addrinfo structure or NULL if not found

   struct addrinfo* wget_dns_cache_add (const char * host, uint16_t port, struct addrinfo *
       addrinfo)
       Parameters
           host Hostname part of the key
           port Port part of the key
           addrinfo Addrinfo structure to cache

       Returns
           The cached addrinfo structure or NULL if not found

   void wget_dns_cache_free (void)
       Free the DNS cache.

       The DNS cache is kept internally in memory. This function releases all its entries and
       then removes the cache itself, thus freeing memory.

       The cache will be re-generated again when calling wget_tcp_resolve(), if the tcp->caching
       flag was set.

Author

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