socket 小问题
我的代码是想让客户端一直向服务器发数据，服务端一直接收数据并输出。
现在运行结果是服务端只接收第一条数据，之后的数据就不接收了。
我是昨天开始学socket，所以不是很懂，多谢大家的指点。
客户端
#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <string.h>#include <errno.h>#include <sys/socket.h>#include <netinet/in.h>#define MAXLINE 4096int main(int argc, char* argv[]){ int clientfd, n; struct sockaddr_in servaddr; char recvline[MAXLINE], sendline[MAXLINE]; if(argc != 2) { printf("usage: ./client <ip address>\n"); exit(0); } if ((clientfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { printf("create socket error %d: %s", errno, strerror(errno)); exit(-1); } memset(&servaddr, 0, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(6666); if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0) { printf("inet_pton error for ip address: %s", argv[1]); exit(0); } if ( connect(clientfd, (struct sockaddr*)(&servaddr), sizeof(servaddr)) < 0) { printf("connect error: %s(errno: %d)\n",strerror(errno),errno); exit(0); } printf("send messgae to server: \n"); fgets(sendline, MAXLINE, stdin); while (strcmp(sendline, "exit") != 0) { if (send(clientfd, sendline,strlen(sendline),0) < 0) { printf("send message error: %s(errno: %d)\n", strerror(errno), errno); exit(0); } fgets(sendline, MAXLINE, stdin); } close(clientfd); return 0;}#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#define MAXLINE 4096int main(){ int listenfd, connfd; struct sockaddr_in serveraddress; char buff[MAXLINE]; int n; if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { fprintf(stderr, "create socket error %d: %s", errno, strerror(errno)); exit(-1); } memset(&serveraddress, 0, sizeof(serveraddress)); serveraddress.sin_family = AF_INET; serveraddress.sin_addr.s_addr = htonl(INADDR_ANY); serveraddress.sin_port = htons(6666); if (bind(listenfd, (struct sockaddr*)(&serveraddress), sizeof(serveraddress)) == -1) { printf("blind socket error %d: %s", errno, strerror(errno)); exit(-1); } if (listen(listenfd, 10) == -1) { printf("listen socket error %d: %s", errno, strerror(errno)); exit(-1); } printf("================listen client request================\n"); memset(buff, 0, MAXLINE); while (strcmp(buff,"exit") != 0) { if ((connfd = accept(listenfd, NULL, NULL)) == -1) { printf("accept socket error %d: %s", errno, strerror(errno)); continue; } n = recv(connfd, buff, sizeof(buff), 0); buff[n] = '\0'; fprintf(stdout, "server has received : %s\n", buff); } close(connfd); close(listenfd); return 0;}