Current File : //usr/share/man/man3head/netdb.h.3head

'\" te
.\" Copyright (c) 1992, X/Open Company Limited.  All Rights Reserved.  Portions Copyright (c) 2004, Sun Microsystems, Inc.  All Rights Reserved.
.\"  Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at  http://www.opengroup.org/bookstore/.
.\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. 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 Sun OS 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. 
.TH netdb.h 3HEAD "10 Sep 2004" "SunOS 5.11" "Headers"
.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
tab();
lw(1.71i) lw(3.79i) 
lw(1.71i) lw(3.79i) 
.
\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
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
_
StandardSee \fBstandards\fR(5).
.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)