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[Networking] IPv4 Socket Address Structure

2006-10-08 09:48:50| 分类： net | 标签： |举报 |字号大中小订阅

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先来介绍一下 structure 会用到的 datatype，以及它们所在的位置（头文件）。下面的所有 datatype 均是 POSIX 定义的标准类型。

Datatype	Description	Header
int8_t uint8_t int16_t uint16_t int32_t uint32_t	Signed 8-bit integer Unsigned 8-bit integer Signed 16-bit integer Unsigned 16-bit integer Signed 32-bit integer Unsigned 32-bit integer	<sys/types.h>
sa_family_t socklen_t	Address family of socket address structure Length of socket address structure, normally uint32_t	<sys/socket.h>
in_addr_t in_port_t	IPv4 address, normally uint32_t TCP or UDP port, normally uint16_t	<netinet/in.h>

Unix 下 IPv4 的数据结构：


struct in_addr {
    in_addr_t       s_addr;        /* 32-bit IPv4 address(network byte ordered) */
};

struct sockaddr_in {
    uint8_t         sin_len;       /* length of structure (16) */
    sa_family_t     sin_family;    /* AF_INET */
    in_port_t       sin_port;      /* 16-bit TCP or UDP port number(network byte ordered) */
    struct in_addr  sin_addr;      /* 32-bit IPv4 address(network byte order) */
    char            sin_zero[8]    /* unused */
};

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