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#include <inttypes.h>
#include <sys/epoll.h>
int main() {
int efd=epoll_create(10);
struct epoll_event x;
if (efd==-1) return 111;;;
if (epoll_ctl(efd,EPOLL_CTL_ADD,0 /* fd */,&x)==-1) return 111;
int i,n;
struct epoll_event y[100];
if ((n=epoll_wait(efd,y,100,1000))==-1) return 111;
if (n>0)
printf("event %d on fd #%d\n",y[0].events,y[0].data.fd);