2 epoll反应堆模型

完整代码在我个人github上欢迎fork  https://github.com/hankai17/test/tree/master/linux_pro/day11

#include   
#include   
#include   
#include   
  
#include   
#include   
#include   
#include   
  
#include   
  
  
#define SERVER_PORT         (7778)  
#define EPOLL_MAX_NUM       (2048)  
#define BUFFER_MAX_LEN      (4096)  
  
char buffer[BUFFER_MAX_LEN];  
  
void str_toupper(char *str)  
{  
    int i;  
    for (i = 0; i < strlen(str); i ++) {  
        str[i] = toupper(str[i]);  
    }  
}  
  
int main(int argc, char **argv)  
{  
    int listen_fd = 0;  
    int client_fd = 0;  
  
    struct sockaddr_in server_addr;  
    struct sockaddr_in client_addr;  
    socklen_t           client_len;  
  
    int epfd = 0;  
    struct epoll_event event, *my_events;  
  
    // socket  
    listen_fd = socket(AF_INET, SOCK_STREAM, 0);  
  
    // bind  
    server_addr.sin_family = AF_INET;  
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);  
    server_addr.sin_port = htons(SERVER_PORT);  
      
    bind(listen_fd, (struct sockaddr*)&server_addr, sizeof(server_addr));  
  
    // listen  
    listen(listen_fd, 10);  
  
    // epoll create  
    epfd = epoll_create(EPOLL_MAX_NUM);  
    if (epfd < 0) {  
        perror("epoll create");  
        goto END;  
    }  
  
    // listen_fd -> epoll  
    event.events = EPOLLIN;  
    event.data.fd = listen_fd;  
    if (epoll_ctl(epfd, EPOLL_CTL_ADD, listen_fd, &event) < 0) {  
        perror("epoll ctl add listen_fd ");  
        goto END;  
    }  
  
  
    my_events = malloc(sizeof(struct epoll_event) * EPOLL_MAX_NUM);  
      
  
    while (1) {  
        // epoll wait  
        int active_fds_cnt = epoll_wait(epfd, my_events, EPOLL_MAX_NUM, -1);  
          
        int i = 0;  
        for (i = 0; i < active_fds_cnt; i++) {  
            // if fd == listen_fd  
            if (my_events[i].data.fd == listen_fd) {  
                //accept  
                client_fd = accept(listen_fd, (struct sockaddr*)&client_addr, &client_len);  
                if (client_fd < 0) {  
                    perror("accept");  
                    continue;  
                }  
  
                char ip[20];  
                printf("new connection[%s:%d]\n", inet_ntop(AF_INET, &client_addr.sin_addr, ip, sizeof(ip)), ntohs(client_addr.sin_port));  
  
                event.events = EPOLLIN | EPOLLET;  
                event.data.fd = client_fd;  
                epoll_ctl(epfd, EPOLL_CTL_ADD, client_fd, &event);  
            }  
            else if (my_events[i].events & EPOLLIN) {  
                printf("EPOLLIN\n");  
                client_fd = my_events[i].data.fd;  
  
                // do read  
  
                buffer[0] = '\0';  
                int n = read(client_fd, buffer, 5);  
                if (n < 0) {  
                    perror("read");  
                    continue;  
                }  
                else if (n == 0) {  
                    epoll_ctl(epfd, EPOLL_CTL_DEL, client_fd, &event);  
                    close(client_fd);  
                }  
                else {  
                    printf("[read]: %s\n", buffer);  
                    buffer[n] = '\0';  
#if 0  
                    str_toupper(buffer);  
                    write(client_fd, buffer, strlen(buffer));  
                    printf("[write]: %s\n", buffer);  
                    memset(buffer, 0, BUFFER_MAX_LEN);  
#endif  
  
#if 1  
                    event.events = EPOLLOUT;  
                    event.data.fd = client_fd;  
                    epoll_ctl(epfd, EPOLL_CTL_MOD, client_fd, &event);  
#endif  
                }  
            }  
            else if (my_events[i].events & EPOLLOUT) {  
                printf("EPOLLOUT\n");  
#if 1  
                client_fd = my_events[i].data.fd;  
                str_toupper(buffer);  
                write(client_fd, buffer, strlen(buffer));  
                printf("[write]: %s\n", buffer);  
                memset(buffer, 0, BUFFER_MAX_LEN);  
  
                event.events = EPOLLIN;  
                event.data.fd = client_fd;  
                epoll_ctl(epfd, EPOLL_CTL_MOD, client_fd, &event);  
#endif  
            }  
        }  
    }  
      
  
  
END:  
    close(epfd);  
    close(listen_fd);  
    return 0;  
}