Manual browser: evdns_compat(3)
| evdns_compat(3) | Library Functions Manual | evdns_compat(3) |
NAME
evdns_compat -Potentially non-threadsafe versions of the functions in dns.h: provided only for backwards compatibility.
SYNOPSIS
#include <event2/dns_compat.h>Functions
struct evdns_server_port * evdns_add_server_port (evutil_socket_t socket, int flags, evdns_request_callback_fn_type callback, void *user_data)
Detailed Description
Potentially non-threadsafe versions of the functions in dns.h: provided only for backwards compatibility.Function Documentation
struct evdns_server_port* evdns_add_server_port (evutil_socket_tsocket, intflags, evdns_request_callback_fn_typecallback, void *user_data) [read]
As evdns_server_new_with_base. Deprecated
This function is deprecated because it does not allow the caller to specify which even_base it uses. The recommended function is evdns_add_server_port_with_base().
int evdns_clear_nameservers_and_suspend (void)
Remove all configured nameservers, and suspend all pending resolves. Resolves will not necessarily be re-attempted until evdns_resume() is called.Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_clear_nameservers_and_suspend().
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_resume()
int evdns_count_nameservers (void)
Get the number of configured nameservers. This returns the number of configured nameservers (not necessarily the number of running nameservers). This is useful for double-checking whether our calls to the various nameserver configuration functions have been successful.Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_count_nameservers().
Returns:
the number of configured nameservers
See Also:
evdns_nameserver_add()
struct evdns_base* evdns_get_global_base (void) [read]
Return the global evdns_base created by event_init() and used by the other deprecated functions. Deprecated
This function is deprecated because use of the global evdns_base is error-prone.
int evdns_init (void)
Initialize the asynchronous DNS library. This function initializes support for non-blocking name resolution by calling evdns_resolv_conf_parse() on UNIX and evdns_config_windows_nameservers() on Windows.Deprecated
This function is deprecated because it always uses the current event base, and is easily confused by multiple calls to event_init(), and so is not safe for multithreaded use. Additionally, it allocates a global structure that only one thread can use. The replacement is evdns_base_new().
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_shutdown()
int evdns_nameserver_add (unsigned long intaddress)
Add a nameserver. The address should be an IPv4 address in network byte order. The type of address is chosen so that it matches in_addr.s_addr.Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_nameserver_add().
Parameters:
address an IP address in network byte order
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_nameserver_ip_add()
int evdns_nameserver_ip_add (const char *ip_as_string)
Add a nameserver. This wraps the evdns_nameserver_add() function by parsing a string as an IP address and adds it as a nameserver.Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_nameserver_ip_add().
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_nameserver_add()
int evdns_resolv_conf_parse (intflags, const char *constfilename)
Parse a resolv.conf file. The 'flags' parameter determines what information is parsed from the resolv.conf file. See the man page for resolv.conf for the format of this file.The following directives are not parsed from the file: sortlist, rotate, no-check-names, inet6, debug.
If this function encounters an error, the possible return values are: 1 = failed to open file, 2 = failed to stat file, 3 = file too large, 4 = out of memory, 5 = short read from file, 6 = no nameservers listed in the file
Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_resolv_conf_parse().
Parameters:
flags any of DNS_OPTION_NAMESERVERS|DNS_OPTION_SEARCH|DNS_OPTION_MISC| DNS_OPTIONS_ALL
filename the path to the resolv.conf file
Returns:
0 if successful, or various positive error codes if an error occurred (see above)
See Also:
resolv.conf(3), evdns_config_windows_nameservers()
int evdns_resolve_ipv4 (const char *name, intflags, evdns_callback_typecallback, void *ptr)
Lookup an A record for a given name. Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_resolve_ipv4().
Parameters:
name a DNS hostname
flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query.
callback a callback function to invoke when the request is completed
ptr an argument to pass to the callback function
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_resolve_ipv6(), evdns_resolve_reverse(), evdns_resolve_reverse_ipv6()
int evdns_resolve_ipv6 (const char *name, intflags, evdns_callback_typecallback, void *ptr)
Lookup an AAAA record for a given name. Parameters:
name a DNS hostname
flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query.
callback a callback function to invoke when the request is completed
ptr an argument to pass to the callback function
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_resolve_ipv4(), evdns_resolve_reverse(), evdns_resolve_reverse_ipv6()
int evdns_resolve_reverse (const struct in_addr *in, intflags, evdns_callback_typecallback, void *ptr)
Lookup a PTR record for a given IP address. Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_resolve_reverse().
Parameters:
in an IPv4 address
flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query.
callback a callback function to invoke when the request is completed
ptr an argument to pass to the callback function
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_resolve_reverse_ipv6()
int evdns_resolve_reverse_ipv6 (const struct in6_addr *in, intflags, evdns_callback_typecallback, void *ptr)
Lookup a PTR record for a given IPv6 address. Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_resolve_reverse_ipv6().
Parameters:
in an IPv6 address
flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query.
callback a callback function to invoke when the request is completed
ptr an argument to pass to the callback function
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_resolve_reverse_ipv6()
int evdns_resume (void)
Resume normal operation and continue any suspended resolve requests. Re-attempt resolves left in limbo after an earlier call to evdns_clear_nameservers_and_suspend().Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_resume().
Returns:
0 if successful, or -1 if an error occurred
See Also:
evdns_clear_nameservers_and_suspend()
void evdns_search_add (const char *domain)
Add a domain to the list of search domains. Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_search_add().
Parameters:
domain the domain to be added to the search list
void evdns_search_clear (void)
Clear the list of search domains. Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_search_clear().
void evdns_search_ndots_set (const intndots)
Set the 'ndots' parameter for searches. Sets the number of dots which, when found in a name, causes the first query to be without any search domain.Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_search_ndots_set().
Parameters:
ndots the new ndots parameter
int evdns_set_option (const char *option, const char *val, intflags)
Set the value of a configuration option. The currently available configuration options are:ndots, timeout, max-timeouts, max-inflight, and attempts
Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_set_option().
Parameters:
option the name of the configuration option to be modified
val the value to be set
flags Ignored.
Returns:
0 if successful, or -1 if an error occurred
void evdns_shutdown (intfail_requests)
Shut down the asynchronous DNS resolver and terminate all active requests. If the 'fail_requests' option is enabled, all active requests will return an empty result with the error flag set to DNS_ERR_SHUTDOWN. Otherwise, the requests will be silently discarded.Deprecated
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to. The recommended function is evdns_base_shutdown().
Parameters:
fail_requests if zero, active requests will be aborted; if non-zero, active requests will return DNS_ERR_SHUTDOWN.
See Also:
evdns_init()
Author
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