arpa_inet.h - Linux

Overview

arpa_inet.h is a header file that contains definitions for the arpa/inet.h library. It includes the standard definitions for internet operations and the following operations.

int htons (short x): Convert a short integer from host byte order to network byte order (big-endian).
short ntohs (short x): Convert a short integer from network byte order to host byte order (little-endian).
long int htonl (long int x): Convert a long integer from host byte order to network byte order (big-endian).
long int ntohl (long int x): Convert a long integer from network byte order to host byte order (little-endian).

Syntax

#include <arpa/inet.h>

Options / Flags

There are no options or flags associated with this library.

Examples

1. Convert a short integer from host byte order to network byte order.

#include <arpa/inet.h>

int main()
{
    short x = 0x1234;
    short y = htons(x);

    printf("Host byte order: %x\n", x);
    printf("Network byte order: %x\n", y);

    return 0;
}

2. Convert a long integer from network byte order to host byte order.

#include <arpa/inet.h>

int main()
{
    long int x = 0x12345678;
    long int y = ntohl(x);

    printf("Network byte order: %lx\n", x);
    printf("Host byte order: %lx\n", y);

    return 0;
}

Common Issues

None reported.

Integration

This library can be used with other Linux commands or tools to perform advanced tasks. For example, it can be used with the socket() function to create a socket and specify the network byte order.

Related Commands

socket() – Create a socket
bind() – Bind a socket to an address
listen() – Listen for connections on a socket
accept() – Accept a connection on a socket
connect() – Connect to a socket
send() – Send data over a socket
recv() – Receive data over a socket
close() – Close a socket