linux下C 网络编程

以时间程序为例介绍了linux下C网络编程的TCP/UDP，服务器端/客户端的基本用法，socket，inet-ptoh，hton，bind，listen，acceept，connect，read，write，快速入门，超实用

#include 
#include 
#include 
#include 

#include “connect_client.h“

int 
connect_client （const char *hostname 
                const char *service 
                int         family 
                int         socktype）
{
    struct addrinfo hints *res *ressave;
    int n sockfd;

    memset（&hints 0 sizeof（struct addrinfo））;

    hints.ai_family = family;
    hints.ai_socktype = socktype; 
    
    n = getaddrinfo（hostname service &hints &res）;

    if （n <0） {
        fprintf（stderr 
                “getaddrinfo error:: [%s]\n“  
                gai_strerror（n））;
        return -1;
    }

    ressave = res;

    sockfd=-1;
    while （res） {
        sockfd = socket（res->ai_family 
                        res->ai_socktype 
                        res->ai_protocol）;

        if （!（sockfd < 0）） {
            if （connect（sockfd res->ai_addr res->ai_addrlen） == 0） 
                break;
            
            close（sockfd）;
            sockfd=-1;
        }
        res=res->ai_next;
    }

    freeaddrinfo（ressave）;
    return sockfd;
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件       1739  2002-10-08 02:12  day\tcpserver.c

     文件        774  2002-10-08 02:13  day\tcpclient.c

     文件       1759  2002-10-08 02:12  day\udpserver.c

     文件        882  2002-10-08 02:12  day\udpclient.c

     文件       1893  2002-10-08 01:47  day\listen_server.c

     文件        395  2002-10-08 01:47  day\listen_server.h

     文件        224  2002-10-08 01:47  day\connect_client.h

     文件       1170  2002-10-08 01:47  day\connect_client.c

     文件        203  2002-10-08 02:42  day\readme

     文件       7410  2005-08-01 14:34  day\tcpserver

     文件       1640  2005-08-01 14:34  day\listen_server.o

     文件       7343  2005-08-01 14:34  day\udpserver

     文件       6332  2005-08-01 14:34  day\tcpclient

     文件       1404  2005-08-01 14:34  day\connect_client.o

     文件       6433  2005-08-01 14:34  day\udpclient

     文件        320  2005-09-29 16:32  day\Makefile

     目录          0  2005-08-01 16:27  day

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