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.\"
.\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for
.\" permission to reproduce portions of its copyrighted documentation.
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.\"
.\" The Institute of Electrical and Electronics Engineers and The Open
.\" Group, have given us permission to reprint portions of their
.\" documentation.
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.\" In the following statement, the phrase ``this text'' refers to portions
.\" of the system documentation.
.\"
.\" Portions of this text are reprinted and reproduced in electronic form
.\" in the SunOS Reference Manual, from IEEE Std 1003.1, 2004 Edition,
.\" Standard for Information Technology -- Portable Operating System
.\" Interface (POSIX), The Open Group Base Specifications Issue 6,
.\" Copyright (C) 2001-2004 by the Institute of Electrical and Electronics
.\" Engineers, Inc and The Open Group. In the event of any discrepancy
.\" between these versions and the original IEEE and The Open Group
.\" Standard, the original IEEE and The Open Group Standard is the referee
.\" document. The original Standard can be obtained online at
.\" http://www.opengroup.org/unix/online.html.
.\"
.\" This notice shall appear on any product containing this material.
.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
.\" You may not use this file except in compliance with the License.
.\"
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
.\" or http://www.opensolaris.org/os/licensing.
.\" See the License for the specific language governing permissions
.\" and limitations under the License.
.\"
.\" When distributing Covered Code, include this CDDL HEADER in each
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
.\" Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
.\" Portions Copyright (c) 2004, Sun Microsystems, Inc. All Rights Reserved.
.\"
.TH NETDB.H 3HEAD "Sep 10, 2004"
.SH NAME
netdb.h, netdb \- definitions for network database operations
.SH SYNOPSIS
.LP
.nf
\fB#include <netdb.h>\fR
.fi
.SH DESCRIPTION
.sp
.LP
The <\fBnetdb.h\fR> header defines the type \fBin_port_t\fR and the type
\fBin_addr_t\fR as described in \fBin.h\fR(3HEAD).
.sp
.LP
The <\fBnetdb.h\fR> header defines the \fBhostent\fR structure that includes
the following members:
.sp
.in +2
.nf
char *h_name /* official name of the host */
char **h_aliases /* pointer to an array of pointers to
alternative host names, terminated
by a null pointer */
int h_addrtype /* address type */
int h_length /* length, in bytes, of the address */
char **h_addr_list /* pointer to an array of pointers to
network addresses (in network byte
order)for the host, terminated by a
null pointer */
.fi
.in -2
.sp
.LP
The <\fBnetdb.h\fR> header defines the \fBnetent\fR structure that includes the
following members:
.sp
.in +2
.nf
char *n_name /* official, fully-qualified */
(including the domain) name
of the network */
char **n_aliases /* pointer to an array of pointers to
alternative network names, terminated */
by a null pointer */
int n_addrtype /* the address type of the network */
in_addr_t n_net /* the network number, in host byte order */
.fi
.in -2
.sp
.LP
The <\fBnetdb.h\fR> header defines the \fBprotoent\fR structure that includes
the following members:
.sp
.in +2
.nf
char *p_name /* official name of the protocol */
char **p_aliases /* pointer to an array of pointers to
alternative protocol names, terminated
by a null pointer */
int p_proto /* protocol number */
.fi
.in -2
.sp
.LP
The <\fBnetdb.h\fR> header defines the \fBservent\fR structure that includes
the following members:
.sp
.in +2
.nf
char *s_name /* oficial name of the service */
char **s_aliases /* pointer to an array of pointers to
alternativeservice names, terminated by
a null pointer */
int s_port /* port number at which the service
resides, in network byte order */
char *s_proto /* name of the protocol to use when
contacting the service */
.fi
.in -2
.sp
.LP
The <\fBnetdb.h\fR> header defines the macro \fBIPPORT_RESERVED\fR with the
value of the highest reserved Internet port number.
.sp
.LP
The <\fBnetdb.h\fR> header provides a declaration for \fBh_errno\fR:
.sp
.LP
extern int h_errno;
.sp
.LP
The <\fBnetdb.h\fR> header defines the following macros for use as error values
for \fBgethostbyaddr()\fR and \fBgethostbyname()\fR:
.sp
.sp
.TS
l l
l l .
\fBHOST_NOT_FOUND\fR \fBNO_DATA\fR
\fBNO_RECOVERY\fR \fBTRY_AGAIN\fR
.TE
.sp
.LP
Inclusion of the <\fBnetdb.h\fR> header may also make visible all symbols from
\fBin.h\fR(3HEAD).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp
.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability Standard
.TE
.SH SEE ALSO
.sp
.LP
\fBIntro\fR(3), \fBendhostent\fR(3NSL), \fBendhostent\fR(3XNET),
\fBendnetent\fR(3SOCKET), \fBendnetent\fR(3XNET), \fBendprotoent\fR(3SOCKET),
\fBendprotoent\fR(3XNET), \fBendservent\fR(3SOCKET), \fBendservent\fR(3XNET),
\fBin.h\fR(3HEAD), \fBattributes\fR(5), \fBstandards\fR(5)
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