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TCP之简单回传（二）
鉴于TCP之简单回传（一） 中所出现的问题，本博文所要采取的一种方法是：
客户端：先向服务器传送一个 int32_t 大小的数据，表示随后所要发送数据的真实长度； 服务器：先接收一个int32_t 大小的数据，再接收真实的数据；本程序中所用到的函数都可以在 TCP之函数封装 中找到；
server服务器端具体实现：
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/stat.h>#include <errno.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#define ERR_EXIT(m) do { perror(m); exit(EXIT_FAILURE); }while(0)void do_server(int fd);int main(int argc, const char *argv[]){//socket int listenfd = socket(AF_INET, SOCK_STREAM, 0 ); if( -1 == listenfd) ERR_EXIT("socket");//地址复用 int on = 1; if(setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on) < 0) ERR_EXIT("setsockopt");//bind struct sockaddr_in addr; memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(8888); //主机字节序转化为网络字节序 addr.sin_addr.s_addr = inet_addr("127.0.0.1");//点分十进制转化成网络字节序 if( -1 == bind( listenfd, (struct sockaddr*)&addr, sizeof(addr))) ERR_EXIT("bind");//listen if( -1 == listen(listenfd,SOMAXCONN )) ERR_EXIT("listen"); //accept int peerfd = accept(listenfd, NULL, NULL);//对方的IP&PORT//read&write do_server(peerfd);//close close(peerfd); close(listenfd); return 0;}void do_server(int fd){ char recvbuf[1024100] = {0}; int cnt =0; while(1) { int32_t len = recv_int32(fd);//先接收一个表示真是长度的int型数据 int nread = readn(fd, recvbuf, len);//读取数据 if(nread == -1)//err { if(errno == EINTR) continue; ERR_EXIT("read"); }else if (nread == 0 || nread < len )//write close { printf("close...\n"); exit(EXIT_FAILURE); } // ok printf("count = %d recv size = %d\n",++cnt, nread); memset(recvbuf, 0, sizeof(recvbuf)); }}
client客户端具体实现：
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/types.h>#include <sys/stat.h>#include <errno.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#define ERR_EXIT(m) do { perror(m); exit(EXIT_FAILURE); }while(0)void do_server(int fd);int main(int argc, const char *argv[]){//socket int peerfd = socket(AF_INET, SOCK_STREAM,0); if( -1 == peerfd) ERR_EXIT("socket");//connect struct sockaddr_in addr; addr.sin_family = AF_INET; addr.sin_port = htons(8888); addr.sin_addr.s_addr = inet_addr("127.0.0.1"); if( -1 == connect(peerfd,(struct sockaddr*)&addr, sizeof(addr) )) ERR_EXIT("connect");//read&write do_server(peerfd); return 0;}void do_server(int fd){ #define SIZE 1024 char sendbuf[SIZE +1]= {0}; int i ; for (i = 0; i < SIZE; i++) { sendbuf[i]= ‘a‘; } int cnt =0; while(1) { int i; for (i = 0; i < 10; i++) { send_int32(fd, SIZE);//先发送一个表示真实长度的int型数据 int nwrite =writen(fd, sendbuf, SIZE);//写数据 if( nwrite != SIZE)//err ERR_EXIT("writen"); printf("cout = %d,write %d bytes\n",++cnt, SIZE); } nano_sleep(4.5); }}
测试结果：
./servercount = 1 recv size = 1024count = 2 recv size = 1024count = 3 recv size = 1024count = 4 recv size = 1024count = 5 recv size = 1024count = 6 recv size = 1024count = 7 recv size = 1024count = 8 recv size = 1024count = 9 recv size = 1024count = 10 recv size = 1024count = 11 recv size = 1024count = 12 recv size = 1024count = 13 recv size = 1024count = 14 recv size = 1024count = 15 recv size = 1024count = 16 recv size = 1024count = 17 recv size = 1024count = 18 recv size = 1024count = 19 recv size = 1024count = 20 recv size = 1024
./clientcout = 1,write 1024 bytescout = 2,write 1024 bytescout = 3,write 1024 bytescout = 4,write 1024 bytescout = 5,write 1024 bytescout = 6,write 1024 bytescout = 7,write 1024 bytescout = 8,write 1024 bytescout = 9,write 1024 bytescout = 10,write 1024 bytescout = 11,write 1024 bytescout = 12,write 1024 bytescout = 13,write 1024 bytescout = 14,write 1024 bytescout = 15,write 1024 bytescout = 16,write 1024 bytescout = 17,write 1024 bytescout = 18,write 1024 bytescout = 19,write 1024 bytescout = 20,write 1024 bytes
TCP之简单回传（二）
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