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man pages section 3: Library Interfaces and Headers

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Updated: Thursday, June 13, 2019
 
 

libresolv(3LIB)

Name

libresolv - resolver library

Synopsis

cc [ flag... ] file... –lresolv [ library... ]
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <netdb.h>

Description

Functions in this library provide for creating, sending, and interpreting packets to the Internet domain name servers.

This library is maintained to provide backward compatibility for both runtime and compilation environments. The shared object is implemented as a filter on libc.so.1. New application development does not need to specify –lnsl or –lsocket.

INTERFACES

The shared object libresolv.so.2 provides the public interfaces defined below. See intro(3) for additional information on shared object interfaces.

__dn_skipname
__fp_query
__hostalias
__p_cdname
__p_class
__p_query
__p_time
__p_type
__putlong
_getlong
_getshort
_res
dn_comp
dn_expand
fp_resstat
h_errno
herror
hstrerror
inet_cidr_ntop
inet_cidr_pton
ns_find_tsig
ns_sign
ns_sign_tcp
ns_sign_tcp_init
ns_verify
ns_verify_tcp
ns_verify_tcp_init
res_hostalias
res_init
res_mkquery
res_nclose
res_ninit
res_nmkquery
res_nquery
res_nquerydomain
res_nsearch
res_nsend
res_nsendsigned
res_query
res_querydomain
res_search
res_send
res_update

Programs are expected to use the aliases defined in <resolv.h> rather than calling the "__" prefixed procedures, as indicated in the following table. Use of the routines in the first column is discouraged.

FUNCTION REFERENCED
ALIAS TO USE
__dn_skipname
dn_skipname
__fp_query
fp_query
__putlong
putlong
__p_cdname
p_cdname
__p_class
p_class
__p_time
p_time
__p_type
p_type

Files

/lib/libresolv.so.2

shared object

/lib/64/libresolv.so.2

64–bit shared object

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
system/library
Interface Stability
Committed
MT-Level
Unsafe for deprecated interfaces; MT-Safe for all others
Standard
BIND 8.2.4

See Also

pvs(1), resolver(3RESOLV), intro(3), attributes(7)