tcp网络编程实例3—并发的多线程实现
tcp_server_mulpthread.c #include <signal.h> #include <stdio.h> #include <errno.h> #include <unistd.h> #include <stdlib.h> #include <time.h> #include <pthread.h> #include <string.h> #include <sys/wait.h> #include <arpa/inet.h> #include <sys/types.h> /* See NOTES */ #include <sys/socket.h> //int socket(int domain, int type, int protocol); //typedef void (*sighandler_t)(int); //sighandler_t signal(int signum, sighandler_t handler); //void perror(const char *s); int socket_fd; void sig_fun(int signo) { if(signo == SIGINT){ printf("signal = %d\n",signo); close(socket_fd); exit(1); } } void out_fd(int fd) { struct sockaddr_in addr; socklen_t len = sizeof(addr); if(getpeername(fd, (struct sockaddr *)&addr, &len) <0){ perror("getpeername"); } int port = ntohs(addr.sin_port); char ip[16]; if(inet_ntop(AF_INET, &addr.sin_addr.s_addr, ip ,16) == NULL){ perror("out_addr:"); } printf("cliet:%s(%d)\n",ip,port); return ; } void do_service(int fd) { char buffer[512]; while(1){ /*相当于不完整管道 *如果服务器从socket中读取到的数据为0,说明客户端关闭了socket或客户端已经挂掉了(服务器读一个写端关闭了的socket) *如果服务器往读端(客户端)关闭了的socket中写数据,将会产生一个SIGPIPE的信号,并且errorno被设置为EPIPE(服务器写一个读端关闭了的socket) */ memset(buffer, 0, sizeof(buffer)); ssize_t size; if((size = read(fd, buffer, sizeof(buffer))) < 0){ perror("read:"); break; }else if(size == 0){ break; }else{ //write(STDOUT_FILENO, buffer, sizeof(buffer)); printf("%s(%ld)\n",buffer,size); if(write(fd, buffer, sizeof(buffer)) <0 ){ if(errno == EPIPE){ printf("erro"); break; } perror("write:"); } } } } void *th_fun(void *arg) { long fd = (long)arg; printf("fd2=%ld\n",fd); out_fd(fd); do_service(fd); close(fd); return (void *)0; } int main(int argc,char *argv[]) { if(argc <2){ perror("argc<2:"); exit(1); } if(signal(SIGINT,sig_fun) == SIG_ERR){ perror("signal:"); exit(1); } /* *1. 创建socket */ if((socket_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0){ perror("socket:"); exit(1); } /* *2.绑定IP地址和端口号 *int bind(int sockfd, const struct sockaddr *addr,socklen_t addrlen); */ struct sockaddr_in serviceaddr; memset(&serviceaddr, 0, sizeof(serviceaddr)); serviceaddr.sin_family = AF_INET; serviceaddr.sin_port = htons(atoi(argv[1])); serviceaddr.sin_addr.s_addr = INADDR_ANY;//一台服务器上可能有多块网卡(多个IP地址) //这个宏是响应本机所有网卡(IP地址)上连接的客户端请求 if(bind(socket_fd, (struct sockaddr *)&serviceaddr, sizeof(serviceaddr)) < 0){ perror("bind:"); exit(1); }; /* *3.监听绑定的端口 *通知系统去监听来自客户端的连接请求 *(将监听到的客户端连接请求放置到对应的队列中) *第二个参数:指定队列的长度 */ if(listen(socket_fd, 10) < 0){ perror("listen:"); exit(1); } /* *4.调用accept函数从队列中获得一个客户端的连接请求 *并返回一个新的socket描述符,这个描述符和和客户端 *的连接请求对应,即这个描述符和某个客户端对应 *如果没有客户端连接,调用此函数会阻塞,直到获得一个客户端的连接 *第二个参数:客户端的地址信息 */ pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED); pthread_t t; while(1){ int fd = accept(socket_fd, NULL, NULL); if(fd < 0){ perror("accept:"); continue; } /* *5.创建子线程进行并发处理 *int pthread_create(pthread_t *thread, const pthread_attr_t *attr, * void *(*start_routine) (void *), void *arg); */ if(pthread_create(&t, &attr, th_fun, (void *)(long)fd) != 0){ perror("pthread_create"); continue; } pthread_attr_destroy(&attr); printf("t = %ld\n",t); //t的值不同,因为每创建一个线程就会给t重新赋值 printf("fd1=%d\n",fd);//fd的值不同,因为没接受到一个客户端,就会返回一个不同的值 } return 0; }
tcp_client_mulpthread.c #include <stdio.h> #include <errno.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <arpa/inet.h> #include <sys/types.h> /* See NOTES */ #include <sys/socket.h> int main(int argc, char *argv[]) { int socket_fd; if(argc < 2){ printf("参数太少"); exit(1); } //1.创建socket if((socket_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0){ perror("socket:"); exit(1); } //2. 连接服务器 struct sockaddr_in serviceaddr; memset(&serviceaddr, 0, sizeof(serviceaddr)); serviceaddr.sin_family = AF_INET; serviceaddr.sin_port = htons(atoi(argv[2])); if(inet_pton(AF_INET, argv[2], &serviceaddr.sin_addr.s_addr) < 0){ perror("inet_pton:"); exit(1); } if(connect(socket_fd, (struct sockaddr *)&serviceaddr, sizeof(serviceaddr)) < 0){ perror("connect"); exit(1); } //3. read/write char buff[512]; size_t size; char *s = ">"; while(1){ write(STDOUT_FILENO, s, 1); memset(buff, 0, 1024); size = read(STDIN_FILENO, buff, sizeof(buff)); if(size <0 ) continue; buff[size -1] = '\0'; if(write(socket_fd, buff, sizeof(buff)) < 0){ perror("write"); }else{ if(read(socket_fd, buff, sizeof(buff)) <0){ perror("read"); continue; }else{ printf("%s\n",buff); } } } //关闭套接字 close(socket_fd); return 0; }