unix网络编程第一章demo

#include "unp.h"
int main(int argc,char *argv[])
{       if(argc<2)
        {
         printf("please input server_ip\n");
         return 0;
        }
        int fd=socket(AF_INET,SOCK_STREAM,0);
        if(fd<0)
        err_quit("socket create error");
        struct sockaddr_in servaddr;
        struct sockaddr_in clientaddr;
        clientaddr.sin_family=AF_INET;
        clientaddr.sin_port=htonl(5900);
        clientaddr.sin_addr.s_addr=htons(INADDR_ANY);
        bind(fd,(SA*)&clientaddr,sizeof(clientaddr));`
        servaddr.sin_family=AF_INET;//message proctoal
        servaddr.sin_port=htons(13);
        if(inet_pton(AF_INET,argv[1],&servaddr.sin_addr)<0)
        err_quit("inet_pton error");
        if(connect(fd,(SA*)&servaddr,sizeof(servaddr))<0)
        err_quit("connect error");
        char buf[1024];
        int read_length=0;
        int count=0;
        while((read_length=read(fd,buf,sizeof(buf)))>0)
        {     count++;
              buf[read_length]=‘\0‘;
              printf("%s\n read %d ",buf,count);
        }
        printf("count=%d\n",count);
        if(read_length<0)
        err-quit("error of read");
        close(fd);
        return 0;

#include "unp.h"
#include <time.h>
int main(int argc,char *argv[])
{
        int listenfd=Socket(AF_INET,SOCK_STREAM,0);
        struct sockaddr_in servaddr;
        servaddr.sin_family=AF_INET;
        inet_pton(AF_INET,"0.0.0.0",&servaddr.sin_addr);
        servaddr.sin_port=htons(13);
        Bind(listenfd,(SA*)&servaddr,sizeof(servaddr));
        Listen(listenfd,10);
        time_t ticks;
        int i;
        char buf[1024];
        for(;;)
        {
          int client_fd=accept(listenfd,NULL,0);
          ticks=time(NULL);
          snprintf(buf,sizeof(buf),"%.24s\r\n",ctime(&ticks));
         for(i=0;i<strlen(buf);++i)
          Write(client_fd,&buf[i],1);
          Close(client_fd);
          //Close(listenfd);
        }
        return 0;
}
~