中学加强校园网站建设,输入代码即可玩的小游戏,北京建设工程主管部门网站,爱站网seo一、TCP多进程并发 1.地址快速重用 先退出服务端#xff0c;后退出客户端#xff0c;则服务端会出现以下错误#xff1a; 地址仍在使用中 解决方法#xff1a; /*地址快速重用*/ int flag1,len sizeof (int); if ( setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, 后退出客户端则服务端会出现以下错误 地址仍在使用中 解决方法 /*地址快速重用*/     int flag1,len sizeof (int);     if ( setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, flag, len) -1) {               perror(setsockopt);               exit(1);     } 2.多进程并发 1fork函数 #include stdio.h #include wait.h #include stdlib.hint main(int argc, char *argv[]) {pid_t pid fork();if(pid 0){perror(fork);exit(0);}else if(pid 0){printf(This is child process.\n);}else{printf(This is father process.\n);wait(NULL);}return 0; } 2多个客户端 代码演示 #include stdio.h #include sys/socket.h #include sys/types.h #include stdlib.h #include arpa/inet.h #include unistd.h #include string.h #include strings.h#define BACKLOG 5 void ClinetHandle(int newfd); int main(int argc, char *argv[]) {int fd, newfd;struct sockaddr_in addr, clint_addr;socklen_t addrlen sizeof(clint_addr);pid_t pid;if(argc 3){fprintf(stderr, %saddrport\n, argv[0]);exit(0);}/*创建套接字*/fd socket(AF_INET, SOCK_STREAM, 0);if(fd 0){perror(socket);exit(0);}addr.sin_family AF_INET;addr.sin_port htons( atoi(argv[2]) );if ( inet_aton(argv[1], addr.sin_addr) 0) {fprintf(stderr, Invalid address\n);exit(EXIT_FAILURE);}/*地址快速重用*/int flag1,len sizeof (int); if ( setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, flag, len) -1) { perror(setsockopt); exit(1); } /*绑定通信结构体*/if(bind(fd, (struct sockaddr *)addr, sizeof(addr) ) -1){perror(bind);exit(0);}/*设置套接字为监听模式*/if(listen(fd, BACKLOG) -1){perror(listen);exit(0);}while(1){/*接受客户端的连接请求生成新的用于和客户端通信的套接字*/newfd accept(fd, (struct sockaddr *)clint_addr, addrlen);if(newfd 0){perror(accept);exit(0);}printf(addr:%s port:%d\n, inet_ntoa(clint_addr.sin_addr), ntohs(clint_addr.sin_port) );if( (pid fork() ) 0){perror(fork);exit(0);}else if(pid 0){close(fd);ClinetHandle(newfd);exit(0);}elseclose(newfd);}close(fd);return 0; } void ClinetHandle(int newfd){int ret;char buf[BUFSIZ] {};while(1){//memset(buf, 0, BUFSIZ);bzero(buf, BUFSIZ); //初始化ret read(newfd, buf, BUFSIZ);if(ret 0){perror(read);exit(0);}else if(ret 0)break;elseprintf(buf %s\n, buf);}close(newfd); } 二、僵尸进程处理 #include stdio.h #include sys/socket.h #include sys/types.h #include stdlib.h #include arpa/inet.h #include unistd.h #include string.h #include strings.h #include signal.h #include sys/wait.h#define BACKLOG 5 void SigHandle(int sig){if(sig SIGCHLD){printf(client exited\n);wait(NULL);} } void ClinetHandle(int newfd); int main(int argc, char *argv[]) {int fd, newfd;struct sockaddr_in addr, clint_addr;socklen_t addrlen sizeof(clint_addr);#if 0struct sigaction act;act.sa_handler SigHandle;act.sa_flags SA_RESTART;sigemptyset(act.sa_mask);sigaction(SIGCHLD, act, NULL); #elsesignal(SIGCHLD, SigHandle); #endifpid_t pid;if(argc 3){fprintf(stderr, %saddrport\n, argv[0]);exit(0);}/*创建套接字*/fd socket(AF_INET, SOCK_STREAM, 0);if(fd 0){perror(socket);exit(0);}addr.sin_family AF_INET;addr.sin_port htons( atoi(argv[2]) );if ( inet_aton(argv[1], addr.sin_addr) 0) {fprintf(stderr, Invalid address\n);exit(EXIT_FAILURE);}/*地址快速重用*/int flag1,len sizeof (int); if ( setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, flag, len) -1) { perror(setsockopt); exit(1); } /*绑定通信结构体*/if(bind(fd, (struct sockaddr *)addr, sizeof(addr) ) -1){perror(bind);exit(0);}/*设置套接字为监听模式*/if(listen(fd, BACKLOG) -1){perror(listen);exit(0);}while(1){/*接受客户端的连接请求生成新的用于和客户端通信的套接字*/newfd accept(fd, (struct sockaddr *)clint_addr, addrlen);if(newfd 0){perror(accept);exit(0);}printf(addr:%s port:%d\n, inet_ntoa(clint_addr.sin_addr), ntohs(clint_addr.sin_port) );if( (pid fork() ) 0){perror(fork);exit(0);}else if(pid 0){close(fd);ClinetHandle(newfd);exit(0);}elseclose(newfd);}close(fd);return 0; } void ClinetHandle(int newfd){int ret;char buf[BUFSIZ] {};while(1){//memset(buf, 0, BUFSIZ);bzero(buf, BUFSIZ);ret read(newfd, buf, BUFSIZ);if(ret 0){perror(read);exit(0);}else if(ret 0)break;elseprintf(buf %s\n, buf);}close(newfd); } 三、TCP并发多线程 #include stdio.h #include sys/socket.h #include sys/types.h #include stdlib.h #include arpa/inet.h #include unistd.h #include string.h #include strings.h #include pthread.h#define BACKLOG 5void *ClinetHandle(void *arg); int main(int argc, char *argv[]) {int fd, newfd;struct sockaddr_in addr, clint_addr;pthread_t tid;socklen_t addrlen sizeof(clint_addr);if(argc 3){fprintf(stderr, %saddrport\n, argv[0]);exit(0);}/*创建套接字*/fd socket(AF_INET, SOCK_STREAM, 0);if(fd 0){perror(socket);exit(0);}addr.sin_family AF_INET;addr.sin_port htons( atoi(argv[2]) );if ( inet_aton(argv[1], addr.sin_addr) 0) {fprintf(stderr, Invalid address\n);exit(EXIT_FAILURE);}/*地址快速重用*/int flag1,len sizeof (int); if ( setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, flag, len) -1) { perror(setsockopt); exit(1); } /*绑定通信结构体*/if(bind(fd, (struct sockaddr *)addr, sizeof(addr) ) -1){perror(bind);exit(0);}/*设置套接字为监听模式*/if(listen(fd, BACKLOG) -1){perror(listen);exit(0);}while(1){/*接受客户端的连接请求生成新的用于和客户端通信的套接字*/newfd accept(fd, (struct sockaddr *)clint_addr, addrlen);if(newfd 0){perror(accept);exit(0);}printf(addr:%s port:%d\n, inet_ntoa(clint_addr.sin_addr), ntohs(clint_addr.sin_port) );pthread_create(tid, NULL, ClinetHandle, newfd); //创建线程pthread_detach(tid); //设置为分离属性}close(fd);return 0; } void *ClinetHandle(void *arg){int ret;char buf[BUFSIZ] {};int newfd *(int *)arg; //传参强转while(1){//memset(buf, 0, BUFSIZ);bzero(buf, BUFSIZ);ret read(newfd, buf, BUFSIZ);if(ret 0){perror(read);exit(0);}else if(ret 0)break;elseprintf(buf %s\n, buf);}printf(client exited\n);close(newfd);return NULL; } Makefile CCgcc CFLAGS-Wall all:client server server:server.c     $(CC) $^ -Wall -o $ -lpthread clean:     rm client server