A back-up server that uses the Epoll function to process both TCP requests and UDP requests under Linux

#include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <assert.h> #include <stdio.h> #include <unistd.h> #include <errno.h> #include < string.h> #include <fcntl.h> #include <stdlib.h> #include <sys/epoll.h> #include <pthread.h > #define Max_event_number 1024#define tcp_buffer_size 512#define udp_buffer_size 1024int setnonblocking (int fd) {i    NT old_option = fcntl (fd, F_GETFL); int new_option = Old_option |    O_nonblock;    Fcntl (FD, F_SETFL, new_option); return old_option;}    void addfd (int epollfd, int fd) {struct epoll_event event;    EVENT.DATA.FD = FD; event.events = Epollin |    Epollet;    Event.events = Epollin;    Epoll_ctl (EPOLLFD, Epoll_ctl_add, FD, &event); Setnonblocking (FD);}    int main (int argc, char* argv[]) {const char* IP = "127.0.01";    int port = 12345;    int i=0;    int ret = 0;    struct SOCKADDR_IN address; Bzero (&addRess, sizeof (address));    address.sin_family = af_inet;    Inet_pton (Af_inet, IP, &address.sin_addr);    Address.sin_port = htons (port);    int LISTENFD = socket (pf_inet, sock_stream, 0);    ASSERT (LISTENFD >= 0);    ret = bind (LISTENFD, (struct sockaddr*) &address, sizeof (address));    ASSERT (Ret! =-1);    RET = Listen (LISTENFD, 5);    ASSERT (Ret! =-1);    Bzero (&address, sizeof (address));    address.sin_family = af_inet;    Inet_pton (Af_inet, IP, &address.sin_addr);    Address.sin_port = htons (port);    int UDPFD = socket (pf_inet, SOCK_DGRAM, 0);    ASSERT (UDPFD >= 0);    ret = bind (UDPFD, (struct sockaddr*) &address, sizeof (address));    ASSERT (Ret! =-1);    struct epoll_event events[Max_event_number];    int EPOLLFD = epoll_create (5);    ASSERT (EPOLLFD! =-1);    ADDFD (EPOLLFD, LISTENFD);    ADDFD (EPOLLFD, UDPFD); while (1) {int number = Epoll_wait (EPOLLFD, Events, Max_event_number, 1 );            if (number < 0) {printf ("Epoll failure\n");        Break            } for (i = 0; i < number; i++) {int sockfd = EVENTS[I].DATA.FD;                if (sockfd = = listenfd) {struct sockaddr_in client_address;                socklen_t client_addrlength = sizeof (client_address);                int CONNFD = Accept (LISTENFD, (struct sockaddr*) &client_address, &client_addrlength);            ADDFD (EPOLLFD, CONNFD);                } else if (sockfd = = udpfd) {char buf[udp_buffer_size];                memset (buf, ' udp_buffer_size ');                struct sockaddr_in client_address;                socklen_t client_addrlength = sizeof (client_address);                ret = Recvfrom (UDPFD, buf, udp_buffer_size-1, 0, (struct sockaddr*) &client_address, &client_addrlength);           if (Ret > 0) {         SendTo (UDPFD, buf, udp_buffer_size-1, 0, (struct sockaddr*) &client_address, client_addrlength); }} else if (Events[i].events & Epollin) {char buf[Tcp_buff                Er_size];                    while (1) {memset (buf, ' n ', tcp_buffer_size);                    ret = recv (SOCKFD, buf, tcp_buffer_size-1, 0); if (Ret < 0) {if (errno = = Eagain) | |                        (errno = = Ewouldblock))                        {break;                        } close (SOCKFD);                    Break                    } else if (ret = = 0) {close (SOCKFD);                    } else {Send (SOCKFD, buf, ret, 0); }                }            }           else {printf ("something else happened \ n");    }}} close (LISTENFD); return 0;}

A back-up server that uses the Epoll function to process both TCP requests and UDP requests under Linux