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author | peter <peter@FreeBSD.org> | 1996-08-29 20:08:19 +0000 |
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committer | peter <peter@FreeBSD.org> | 1996-08-29 20:08:19 +0000 |
commit | 1f1fd8028fddf809ce8077697ffa07cb30a1e5d2 (patch) | |
tree | 2cf4d77f1b2f64006b349d61712604ce2acf338e /lib/libc/net/gethostbyname.3 | |
parent | d971f8ba30d6c175abff84fb92fc284744fa18ac (diff) | |
download | FreeBSD-src-1f1fd8028fddf809ce8077697ffa07cb30a1e5d2.zip FreeBSD-src-1f1fd8028fddf809ce8077697ffa07cb30a1e5d2.tar.gz |
Merge in bind-4.9.4-P1 resolver...
Diffstat (limited to 'lib/libc/net/gethostbyname.3')
-rw-r--r-- | lib/libc/net/gethostbyname.3 | 249 |
1 files changed, 0 insertions, 249 deletions
diff --git a/lib/libc/net/gethostbyname.3 b/lib/libc/net/gethostbyname.3 deleted file mode 100644 index 702a116..0000000 --- a/lib/libc/net/gethostbyname.3 +++ /dev/null @@ -1,249 +0,0 @@ -.\" Copyright (c) 1983, 1987, 1991, 1993 -.\" The Regents of the University of California. All rights reserved. -.\" -.\" Redistribution and use in source and binary forms, with or without -.\" modification, are permitted provided that the following conditions -.\" are met: -.\" 1. Redistributions of source code must retain the above copyright -.\" notice, this list of conditions and the following disclaimer. -.\" 2. Redistributions in binary form must reproduce the above copyright -.\" notice, this list of conditions and the following disclaimer in the -.\" documentation and/or other materials provided with the distribution. -.\" 3. All advertising materials mentioning features or use of this software -.\" must display the following acknowledgement: -.\" This product includes software developed by the University of -.\" California, Berkeley and its contributors. -.\" 4. Neither the name of the University nor the names of its contributors -.\" may be used to endorse or promote products derived from this software -.\" without specific prior written permission. -.\" -.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND -.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE -.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS -.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY -.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -.\" SUCH DAMAGE. -.\" -.\" @(#)gethostbyname.3 8.2 (Berkeley) 4/19/94 -.\" -.Dd April 19, 1994 -.Dt GETHOSTBYNAME 3 -.Os BSD 4.2 -.Sh NAME -.Nm gethostbyname , -.Nm gethostbyaddr , -.Nm gethostent , -.Nm sethostent , -.Nm endhostent , -.Nm herror -.Nd get network host entry -.Sh SYNOPSIS -.Fd #include <netdb.h> -.Fd extern struct h_errno; -.Ft struct hostent * -.Fn gethostbyname "char *name" -.Ft struct hostent * -.Fn gethostbyaddr "char *addr" "int len" "int type" -.Ft struct hostent * -.Fn gethostent void -.Fn sethostent "int stayopen" -.Fn endhostent void -.Fn herror "char *string" -.Sh DESCRIPTION -The -.Fn gethostbyname -and -.Fn gethostbyaddr -functions -each return a pointer to an object with the -following structure describing an internet host -referenced by name or by address, respectively. -This structure contains either the information obtained from the name server, -.Xr named 8 , -or broken-out fields from a line in -.Pa /etc/hosts . -If the local name server is not running these routines do a lookup in -.Pa /etc/hosts . -.Bd -literal -struct hostent { - char *h_name; /* official name of host */ - char **h_aliases; /* alias list */ - int h_addrtype; /* host address type */ - int h_length; /* length of address */ - char **h_addr_list; /* list of addresses from name server */ -}; -#define h_addr h_addr_list[0] /* address, for backward compatibility */ -.Ed -.Pp -The members of this structure are: -.Bl -tag -width h_addr_list -.It Fa h_name -Official name of the host. -.It Fa h_aliases -A zero terminated array of alternate names for the host. -.It Fa h_addrtype -The type of address being returned; currently always -.Dv AF_INET . -.It Fa h_length -The length, in bytes, of the address. -.It Fa h_addr_list -A zero terminated array of network addresses for the host. -Host addresses are returned in network byte order. -.It Fa h_addr -The first address in -.Fa h_addr_list ; -this is for backward compatibility. -.Pp -When using the nameserver, -.Fn gethostbyname -will search for the named host in the current domain and its parents -unless the name ends in a dot. -If the name contains no dot, and if the environment variable -.Dq Ev HOSTALIASES -contains the name of an alias file, the alias file will first be searched -for an alias matching the input name. -See -.Xr hostname 7 -for the domain search procedure and the alias file format. -.Pp -The -.Fn sethostent -function -may be used to request the use of a connected -.Tn TCP -socket for queries. -If the -.Fa stayopen -flag is non-zero, -this sets the option to send all queries to the name server using -.Tn TCP -and to retain the connection after each call to -.Fn gethostbyname -or -.Fn gethostbyaddr . -Otherwise, queries are performed using -.Tn UDP -datagrams. -.Pp -The -.Fn endhostent -function -closes the -.Tn TCP -connection. -.Sh FILES -.Bl -tag -width /etc/hosts -compact -.It Pa /etc/hosts -.El -.Sh DIAGNOSTICS -Error return status from -.Fn gethostbyname -and -.Fn gethostbyaddr -is indicated by return of a null pointer. -The external integer -.Va h_errno -may then be checked to see whether this is a temporary failure -or an invalid or unknown host. -The routine -.Fn herror -can be used to print an error message describing the failure. -If its argument -.Fa string -is -.Pf non Dv -NULL , -it is printed, followed by a colon and a space. -The error message is printed with a trailing newline. -.Pp -The variable -.Va h_errno -can have the following values: -.Bl -tag -width HOST_NOT_FOUND -.It Dv HOST_NOT_FOUND -No such host is known. -.It Dv TRY_AGAIN -This is usually a temporary error -and means that the local server did not receive -a response from an authoritative server. -A retry at some later time may succeed. -.It Dv NO_RECOVERY -Some unexpected server failure was encountered. -This is a non-recoverable error. -.It Dv NO_DATA -The requested name is valid but does not have an IP address; -this is not a temporary error. -This means that the name is known to the name server but there is no address -associated with this name. -Another type of request to the name server using this domain name -will result in an answer; -for example, a mail-forwarder may be registered for this domain. -.El -.Sh SEE ALSO -.Xr resolver 3 , -.Xr hosts 5 , -.Xr hostname 7 , -.Xr named 8 -.Sh CAVEAT -The -.Fn gethostent -function -is defined, and -.Fn sethostent -and -.Fn endhostent -are redefined, -when -.Xr libc 3 -is built to use only the routines to lookup in -.Pa /etc/hosts -and not the name server. -.Pp -The -.Fn gethostent -function -reads the next line of -.Pa /etc/hosts , -opening the file if necessary. -.Pp -The -.Fn sethostent -function -opens and/or rewinds the file -.Pa /etc/hosts . -If the -.Fa stayopen -argument is non-zero, -the file will not be closed after each call to -.Fn gethostbyname -or -.Fn gethostbyaddr . -.Pp -The -.Fn endhostent -function -closes the file. -.Sh HISTORY -The -.Fn herror -function appeared in -.Bx 4.3 . -The -.Fn endhostent , -.Fn gethostbyaddr , -.Fn gethostbyname , -.Fn gethostent , -and -.Fn sethostent -functions appeared in -.Bx 4.2 . -.Sh BUGS -These functions use static data storage; -if the data is needed for future use, it should be -copied before any subsequent calls overwrite it. -Only the Internet -address format is currently understood. |