libwget-dns-caching(3)

NAME
libwget-dns-caching - DNS caching

SYNOPSIS

  Data Structures
struct cache_entry
struct wget_dns_cache_st

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

Detailed Description

DNS cache management functions.

Function Documentation

  int wget_dns_cache_init (wget_dns_cache ** cache)

Parameters
    cache Pointer to return newly allocated and initialized wget_dns_cache instance

Returns
    WGET_E_SUCCESS if OK, WGET_E_MEMORY if out-of-memory or WGET_E_INVALID if the mutex initialization failed.

Allocates and initializes a wget_dns_cache instance.

  void wget_dns_cache_free (wget_dns_cache ** cache)

Parameters
    [in/out] cache Pointer to wget_dns_cache instance that will be freed and NULLified.

Free the resources allocated by wget_dns_cache_init().

  struct addrinfo * wget_dns_cache_get (wget_dns_cache * cache, const char * host, uint16_t port)

Parameters
    cache A wget_dns_cache instance, created by wget_dns_cache_init().
    host Hostname to look up
    port Port to look up

Returns
    The cached addrinfo structure or NULL if not found

  int wget_dns_cache_add (wget_dns_cache * cache, const char * host, uint16_t port, struct addrinfo ** addrinfo)

Parameters
    cache A wget_dns_cache instance, created by wget_dns_cache_init().
    host Hostname part of the key
    port Port part of the key
    [in/out] addrinfo Addrinfo structure to cache, returns cached addrinfo

Returns
    WGET_E_SUCCESS on success, else a WGET_E_* error value

This functions adds addrinfo to the given DNS cache cache.

If an entry for [host,port] already exists, addrinfo is free'd and replaced by the cached entry. Do not free addrinfo yourself - this will be done when the whole cache is freed.

Author

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