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.\"     $OpenBSD: net_addrcmp.3,v 1.3 2001/08/07 06:53:27 deraadt Exp $

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.\" Copyright (c) 1999 Theo de Raadt

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.Dd July 3, 1999

.Dt NET_ADDRCMP 3

.Os

.Sh NAME

.Nm net_addrcmp

.Nd compare socket address structures

.Sh SYNOPSIS

.Fd #include 

.Ft int

.Fn net_addrcmp "struct sockaddr *sa1" "struct sockaddr *sa2"

.Sh DESCRIPTION

The

.Fn net_addrcmp

function compares two socket address structures,

.Fa sa1

and

.Fa sa2 .

.Sh RETURN VALUES

If

.Fa sa1

and

.Fa sa2

are for the same address,

.Fn net_addrcmp

returns 0.

.Pp

The

.Fa sa_len

fields are compared first.

If they do not match,

.Fn net_addrcmp

returns \-1 or 1 if

.Li sa1->sa_len

is less than or greater than

.Li sa2->sa_len ,

respectively.

.Pp

Next, the

.Fa sa_family

members are compared.

If they do not match,

.Fn net_addrcmp

returns \-1 or 1 if

.Li sa1->sa_family

is less than or greater than

.Li sa2->sa_family ,

respectively.

.Pp

Lastly, if each socket address structure's

.Fa sa_len

and

.Fa sa_family

fields match,

the protocol-specific data (the

.Fa sa_data

field) is compared.

If there's a match, both

.Fa sa1

and

.Fa sa2

must refer to the same address, and 0 is returned; otherwise, a value >0

or <0 is returned.

.Sh HISTORY

A

.Fn net_addrcmp

function was added in

.Ox 2.5 .