?? netchat1.c
字號:
/* * server * tcp * 文字聊天 */#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <netinet/in.h>#include <sys/socket.h>#include <sys/wait.h>#include <unistd.h>#include <arpa/inet.h>#define MAXBUF 1024int main(int argc, char **argv){ int sockfd, new_fd; socklen_t len; struct sockaddr_in my_addr, their_addr; unsigned int myport, lisnum; char buf[MAXBUF + 1]; //設端口號 if (argv[1]) myport = atoi(argv[1]); else myport = 7838; //設最大連接個數 if (argv[2]) lisnum = atoi(argv[2]); else lisnum = 2; if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) { perror("socket"); exit(1); } bzero(&my_addr, sizeof(my_addr)); my_addr.sin_family = PF_INET; my_addr.sin_port = htons(myport); if (argv[3]) my_addr.sin_addr.s_addr = inet_addr(argv[3]); else my_addr.sin_addr.s_addr = INADDR_ANY; if (bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))== -1) { perror("bind"); exit(1); } if (listen(sockfd, lisnum) == -1) { perror("listen"); exit(1); } while (1) { printf("\n----等待新的連接到來開始新一輪聊天……\n"); len = sizeof(struct sockaddr); if ((new_fd = accept(sockfd, (struct sockaddr *) &their_addr,&len)) == -1) { perror("accept"); exit(errno); } else printf("server: got connection from %s, port %d, socket %d\n", inet_ntoa(their_addr.sin_addr), ntohs(their_addr.sin_port), new_fd); /* 開始處理每個新連接上的數據收發 */ while (1) { /* 發消息給客戶端 */ bzero(buf, MAXBUF + 1); printf("請輸入要發送給對方的消息:"); fgets(buf, MAXBUF, stdin); //輸入 if (!strncasecmp(buf, "quit", 4)) {//quit printf("自己請求終止聊天!\n"); break; } len = send(new_fd, buf, strlen(buf) - 1, 0);//發送 if (len > 0) printf("消息:%s\t發送成功,共發送了%d個字節!\n",buf, len); else { printf("消息'%s'發送失敗!錯誤代碼是%d,錯誤信息是'%s'\n",buf, errno, strerror(errno)); break; } bzero(buf, MAXBUF + 1); /* 接收客戶端的消息 */ len = recv(new_fd, buf, MAXBUF, 0); if (len > 0) printf("接收消息成功:'%s',共%d個字節的數據\n",buf, len); else { if (len < 0) printf("消息接收失敗!錯誤代碼是%d,錯誤信息是'%s'\n",errno, strerror(errno)); else printf("對方退出了,聊天終止\n"); break; } }//while close(new_fd); /* 處理每個新連接上的數據收發結束 */ }//while close(sockfd); return 0;}/* * fgets(buf, MAXSIZE, stdin); * strncasecmp(buf, "quit", 4); */
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