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-.\" Copyright 2000 Sam Varshavchik <mrsam@courier-mta.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References: RFC 2553
-.TH getipnodebyname 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-getipnodebyname, getipnodebyaddr, freehostent \- get network
-hostnames and addresses
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/types.h>
-.B #include <sys/socket.h>
-.B #include <netdb.h>
-.P
-.BI "[[deprecated]] struct hostent *getipnodebyname(const char *" name ", int " af ,
-.BI "                                            int " flags ", int *" error_num );
-.BI "[[deprecated]] struct hostent *getipnodebyaddr(const void " addr [. len ],
-.BI "                                            size_t " len ", int " af ,
-.BI "                                            int *" "error_num" );
-.BI "[[deprecated]] void freehostent(struct hostent *" "ip" );
-.fi
-.SH DESCRIPTION
-These functions are deprecated (and unavailable in glibc).
-Use
-.BR getaddrinfo (3)
-and
-.BR getnameinfo (3)
-instead.
-.P
-The
-.BR getipnodebyname ()
-and
-.BR getipnodebyaddr ()
-functions return the names and addresses of a network host.
-These functions return a pointer to the
-following structure:
-.P
-.in +4n
-.EX
-struct hostent {
-    char  *h_name;
-    char **h_aliases;
-    int    h_addrtype;
-    int    h_length;
-    char **h_addr_list;
-};
-.EE
-.in
-.P
-These functions replace the
-.BR gethostbyname (3)
-and
-.BR gethostbyaddr (3)
-functions, which could access only the IPv4 network address family.
-The
-.BR getipnodebyname ()
-and
-.BR getipnodebyaddr ()
-functions can access multiple network address families.
-.P
-Unlike the
-.B gethostby
-functions,
-these functions return pointers to dynamically allocated memory.
-The
-.BR freehostent ()
-function is used to release the dynamically allocated memory
-after the caller no longer needs the
-.I hostent
-structure.
-.SS getipnodebyname() arguments
-The
-.BR getipnodebyname ()
-function
-looks up network addresses for the host
-specified by the
-.I name
-argument.
-The
-.I af
-argument specifies one of the following values:
-.TP
-.B AF_INET
-The
-.I name
-argument points to a dotted-quad IPv4 address or a name
-of an IPv4 network host.
-.TP
-.B AF_INET6
-The
-.I name
-argument points to a hexadecimal IPv6 address or a name
-of an IPv6 network host.
-.P
-The
-.I flags
-argument specifies additional options.
-More than one option can be specified by bitwise OR-ing
-them together.
-.I flags
-should be set to 0
-if no options are desired.
-.TP
-.B AI_V4MAPPED
-This flag is used with
-.B AF_INET6
-to request a query for IPv4 addresses instead of
-IPv6 addresses; the IPv4 addresses will
-be mapped to IPv6 addresses.
-.TP
-.B AI_ALL
-This flag is used with
-.B AI_V4MAPPED
-to request a query for both IPv4 and IPv6 addresses.
-Any IPv4 address found will be mapped to an IPv6 address.
-.TP
-.B AI_ADDRCONFIG
-This flag is used with
-.B AF_INET6
-to
-further request that queries for IPv6 addresses should not be made unless
-the system has at least one IPv6 address assigned to a network interface,
-and that queries for IPv4 addresses should not be made unless the
-system has at least one IPv4 address assigned to a network interface.
-This flag may be used by itself or with the
-.B AI_V4MAPPED
-flag.
-.TP
-.B AI_DEFAULT
-This flag is equivalent to
-.BR "(AI_ADDRCONFIG | AI_V4MAPPED)" .
-.SS getipnodebyaddr() arguments
-The
-.BR getipnodebyaddr ()
-function
-looks up the name of the host whose
-network address is
-specified by the
-.I addr
-argument.
-The
-.I af
-argument specifies one of the following values:
-.TP
-.B AF_INET
-The
-.I addr
-argument points to a
-.I struct in_addr
-and
-.I len
-must be set to
-.IR "sizeof(struct in_addr)" .
-.TP
-.B AF_INET6
-The
-.I addr
-argument points to a
-.I struct in6_addr
-and
-.I len
-must be set to
-.IR "sizeof(struct in6_addr)" .
-.SH RETURN VALUE
-NULL is returned if an error occurred, and
-.I error_num
-will contain an error code from the following list:
-.TP
-.B HOST_NOT_FOUND
-The hostname or network address was not found.
-.TP
-.B NO_ADDRESS
-The domain name server recognized the network address or name,
-but no answer was returned.
-This can happen if the network host has only IPv4 addresses and
-a request has been made for IPv6 information only, or vice versa.
-.TP
-.B NO_RECOVERY
-The domain name server returned a permanent failure response.
-.TP
-.B TRY_AGAIN
-The domain name server returned a temporary failure response.
-You might have better luck next time.
-.P
-A successful query returns a pointer to a
-.I hostent
-structure that contains the following fields:
-.TP
-.I h_name
-This is the official name of this network host.
-.TP
-.I h_aliases
-This is an array of pointers to unofficial aliases for the same host.
-The array is terminated by a null pointer.
-.TP
-.I h_addrtype
-This is a copy of the
-.I af
-argument to
-.BR getipnodebyname ()
-or
-.BR getipnodebyaddr ().
-.I h_addrtype
-will always be
-.B AF_INET
-if the
-.I af
-argument was
-.BR AF_INET .
-.I h_addrtype
-will always be
-.B AF_INET6
-if the
-.I af
-argument was
-.BR AF_INET6 .
-.TP
-.I h_length
-This field will be set to
-.I sizeof(struct in_addr)
-if
-.I h_addrtype
-is
-.BR AF_INET ,
-and to
-.I sizeof(struct in6_addr)
-if
-.I h_addrtype
-is
-.BR AF_INET6 .
-.TP
-.I h_addr_list
-This is an array of one or more pointers to network address structures for the
-network host.
-The array is terminated by a null pointer.
-.SH STANDARDS
-None.
-.SH HISTORY
-.\" Not in POSIX.1-2001.
-RFC\ 2553.
-.P
-Present in glibc 2.1.91-95, but removed again.
-Several UNIX-like systems support them, but all
-call them deprecated.
-.SH SEE ALSO
-.BR getaddrinfo (3),
-.BR getnameinfo (3),
-.BR inet_ntop (3),
-.BR inet_pton (3)