sockaddr_in(3type)

sockaddr_in3type

Ipv4 socket address

Usage

#include <netinet/in.h>

struct sockaddr_in { sa_family_t sin_family; /* AF_INET */ in_port_t sin_port; /* Port number */ struct in_addr sin_addr; /* IPv4 address */ };

struct in_addr { in_addr_t s_addr; };

typedef uint32_t in_addr_t; typedef uint16_t in_port_t;

Library

Standard C library (libc)

Overview

sockaddr_in

Describes an IPv4 Internet domain socket address.

.sin_port and .sin_addr are stored in network byte order.

Releases

3 releases since Debian 12 (Bookworm); the text changed 2 times.

  1. 12
  2. 13
  3. Arch

Standards

POSIX.1-2024.

History

POSIX.1-2001.

From man-pages 6.19-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.