libwget-dns-caching3
Dns caching
Usage
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.
Releases
4 releases since Debian 10 (Buster); the text changed 2 times.