res_send(3) Library Functions Manual res_send(3)
NAME
res_send - Sends a query to a name server and retrieves a response
LIBRARY
Standard C Library (libc.a, libc.so)
SYNOPSIS
#include <sys/types.h> #include <netinet/in.h> #include <arpa/nameser.h> #include <resolv.h>
int res_send ( const u_char *msg_ptr, int msg_len, u_char *answer, int ans_len );
PARAMETERS
Points to the beginning of a message. Specifies the length of the message. Points to an address where the response is stored. Specifies
the size of the answer area.
DESCRIPTION
The res_send() function sends a query to name servers and calls the res_init() function if the RES_INIT option of the _res data structure
is not set. This function sends the query to the local name server and handles timeouts and retries.
The res_send() function is one of a set of subroutines that form the resolver, a set of functions that resolve domain names. Global infor-
mation that is used by the resolver functions is kept in the _res data structure. The /include/resolv.h file contains the _res data
structure definition.
RETURN VALUES
Upon successful completion, the res_send() function returns the length of the message. Otherwise, -1 is returned and the h_errno external
variable is set with an error code, if any. Error code values and reasons are defined in <netdb.h>.
FILES
Contains general name server and domain name information.
RELATED INFORMATION
Functions: dn_comp(3), dn_expand(3), dn_find(3), dn_skipname(3), _getlong(3), _getshort(3), putlong(3), putshort(3), res_init(3),
res_mkquery(3), res_query(3), res_search(3). delim off
res_send(3)
