Android--推送机制实现原理（四）-自己实现推送功能--心跳包

客户端、长连接和心跳包参考博客：http://blog.csdn.net/zh724738989/article/details/42007099

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客户端

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服务器端C代码（0.01版）：

/**************服务器端程序***************/#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <netdb.h>#include <time.h>int sockfd;char *hbResponse = "ok";void do_service(fd){    char buf[100];    char hb[] = "hb";    int i;    int len = recv(fd,buf,100,0);/*读取信息*/    if(len < 0){        printf("recv error!\n");        exit(1);    }else if (len == 0){        printf("the client quit!\n");    }else {        buf[len] = '\0';        printf("receive message: %s\n",buf);    }    if(i = strncmp(buf,hb,2) == 0){/*确认是心跳包*/           write(fd,hbResponse,strlen(hbResponse));    }else {/*不是心跳包处理逻辑*/        long t = time(0);        char *s = ctime(&t);        write(fd,s,strlen(s));    }}void out_client(struct sockaddr_in clientaddr){    char buffer[16];    inet_ntop(AF_INET,&clientaddr.sin_addr.s_addr,buffer,sizeof(clientaddr));    unsigned short port = ntohs(clientaddr.sin_port);    printf("client ip:%s (%d)\n",buffer,port);}int main(int argc,char *argv[]){    if(argc < 2)    {        fprintf(stderr,"usage: %s port\n",argv[0]);        exit(1);    }    /*create socket*/    sockfd = socket(AF_INET,SOCK_STREAM,0);    if(sockfd < 0)    {        fprintf(stderr,"socket: %s\n",strerror(errno));        exit(1);    }    /*set ip and port*/    struct sockaddr_in addr;    memset(&addr,0,sizeof(addr));    addr.sin_family = AF_INET;    addr.sin_port = htons(atoi(argv[1]));    addr.sin_addr.s_addr = INADDR_ANY;     /*bind ip and port*/    int len = sizeof(addr);    if(bind(sockfd,(struct sockaddr*)&addr,len) < 0)    {        fprintf(stderr,"bind: %s\n",strerror(errno));        exit(1);    }    /*begin to listen*/    if(listen(sockfd,10) < 0)    {        fprintf(stderr,"listen: %s\n",strerror(errno));        exit(1);    }    while(1)    {        struct sockaddr_in clientaddr;        int c_len = sizeof(clientaddr);        int fd = accept(sockfd,(struct sockaddr*)&clientaddr,&c_len);        if(fd < 0)        {            fprintf(stderr,"accept: %s\n",strerror(errno));            continue;        }        while(1){            out_client(clientaddr);            do_service(fd);            //close(fd);        }    }    return 0;}