Linux 网络编程 <1>

环境
Cygwin+windows2003

说明：

服务端(Server)

#include <sys/types.h>
#include <sys/socket.h>
#include <time.h>
#include <netinet/in.h>
#include <stddef.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>

int main(int argc,char **argv ){
    int    listenfd,connectfd;
    struct sockaddr_in servaddr;
    char   buffer[4096];
    time_t ticks;
    listenfd=socket(AF_INET,SOCK_STREAM,0);
    bzero(&servaddr,sizeof(servaddr));
    servaddr.sin_family=AF_INET;
    servaddr.sin_addr.s_addr=htonl(INADDR_ANY);//转换成网络字符顺序
     servaddr.sin_port=htons(13);//转换成网络字符顺序
    bind(listenfd,(struct sockaddr *) &servaddr,sizeof(servaddr));
    listen(listenfd,1024);
    for (;;) {
connectfd=accept(listenfd,(struct  sockaddr *)NULL,NULL);
ticks=time(NULL);
        snprintf(buffer,sizeof(buffer),"-------%.24s----------",ctime(&ticks));
        write(connectfd,buffer,strlen(buffer));

        close(connectfd);

}
}


客户端(Client)
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
void birdprint(char *value,...){
printf("\r\nvalue=%s",value);
}

int main(int argc, char **argv)
{
argv[1]="127.0.0.1";
birdprint("------开始run------");
int sockfd, n;
char recvline[4096 + 1];
struct sockaddr_in servaddr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port   = htons(13); /* daytime server */
inet_pton(AF_INET, argv[1], &servaddr.sin_addr);
connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
while ( (n = read(sockfd, recvline, 4096)) > 0) {
recvline[n] = 0; /* null terminate */
if (fputs(recvline, stdout) == EOF){
}
}

birdprint("------结束run------");
exit(0);
}


//注意如下转换
      struct sockaddr_in servaddr;
     (struct sockaddr *) &servaddr


struct sockaddr
{
    unsigned short int sa_family;
    char sa_data[14];
};

struct socketaddr_in
{
    unsigned short int sin_family;
    uint16_t sin_port;
    struct in_addr sin_addr;
    unsigned char sin_zero[8];
};
struct in_addr
{
    uint32_t s_addr;
};

  char array4w[2][3][4][5];
                         int i,j,k,l;
                         for(i=0;i<2;i++)
                             for(j=0;j<3;j++)
                                 for(k=0;k<4;k++)
                                for(l=0;l<4;l++)
                                     array4w[i][j][k][l]=i*12+j*4+k+l;


[2][3][4][5]


   {
{
{
0_0_0_0
0_0_0_1
0_0_0_2
0_0_0_3
0_0_0_4
},
{
0_0_1_0
0_0_1_1
0_0_1_2
0_0_1_3
0_0_1_4
},
{
0_0_2_0
0_0_2_1
0_0_2_2
0_0_2_3
0_0_2_4
},
{
0_0_3_0
0_0_3_1
0_0_3_2
0_0_3_3
0_0_3_4
}
},
{
{
0_1_0_0
0_1_0_1
0_1_0_2
0_1_0_3
0_1_0_4
},
{
0_1_1_0
0_1_1_1
0_1_1_2
0_1_1_3
0_1_1_4
},
{
0_1_2_0
0_1_2_1
0_1_2_2
0_1_2_3
0_1_2_4
},
{
0_1_3_0
0_1_3_1
0_1_3_2
0_1_3_3
0_1_3_4
}
   
  },

  {
{
0_2_0_0
0_2_0_1
0_2_0_2
0_2_0_3
0_2_0_4
},
{
0_2_1_0
0_2_1_1
0_2_1_2
0_2_1_3
0_2_1_4
},
{
0_2_2_0
0_2_2_1
0_2_2_2
0_2_2_3
0_2_2_4
},
{
0_2_3_0
0_2_3_1
0_2_3_2
0_2_3_3
0_2_3_4
}
   }
},
{

   {
{
1_0_0_0
1_0_0_1
1_0_0_2
1_0_0_3
1_0_0_4
},
{
1_0_1_0
1_0_1_1
1_0_1_2
1_0_1_3
1_0_1_4
},
{
1_0_2_0
1_0_2_1
1_0_2_2
1_0_2_3
1_0_2_4
},
{
1_0_3_0
1_0_3_1
1_0_3_2
1_0_3_3
1_0_3_4
}
},
{
{
1_1_0_0
1_1_0_1
1_1_0_2
1_1_0_3
1_1_0_4
},
{
1_1_1_0
1_1_1_1
1_1_1_2
1_1_1_3
1_1_1_4
},
{
1_1_2_0
1_1_2_1
1_1_2_2
1_1_2_3
1_1_2_4
},
{
1_1_3_0
1_1_3_1
1_1_3_2
1_1_3_3
1_1_3_4
}
   },
    {
{
1_2_0_0
1_2_0_1
1_2_0_2
1_2_0_3
1_2_0_4
},
{
1_2_1_0
1_2_1_1
1_2_1_2
1_2_1_3
1_2_1_4
},
{
1_2_2_0
1_2_2_1
1_2_2_2
1_2_2_3
1_2_2_4
},
{
1_2_3_0
1_2_3_1
1_2_3_2
1_2_3_3
1_2_3_4
}
    }
}