libwget-dns-caching(3) Introduction to Library Functions

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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wget2 Version 2.2.1 libwget-dns-caching(3)