问检测客户端断开连接

EN

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include<string.h>


void printHex(char * bts  )
{
    char *s = bts;
    int i=0;
    do
    {
        printf("%02X ", (unsigned char  ) *bts);

    } while (* ++bts !=0);
    printf("%s\n",s);

}


int main()
{
    char str[100];
    int listen_fd, comm_fd;

    struct sockaddr_in servaddr;

    listen_fd = socket(AF_INET, SOCK_STREAM, 0);

    bzero( &servaddr, sizeof(servaddr));

    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htons(INADDR_ANY);
    servaddr.sin_port = htons(22000);
    printf("binding\n");

    bind(listen_fd, (struct sockaddr *) &servaddr, sizeof(servaddr));

    printf("listening\n");

    listen(listen_fd, 10);
    printf("accepting\n");

    comm_fd = accept(listen_fd, (struct sockaddr*) NULL, NULL);
    printf("accep done\n");

    int cn =0;

    while(1)
    {

        bzero( str, 100);
        printf("will read\n");
        int br= read(comm_fd,str,100);
        printf("read done\n");

        if (br>0)
        {
            printHex(str);
        }

    }
}