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#include <stdio.h>
#include <sys/epoll.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
int main(int argc, char **argv) {
int epfd = epoll_create(1);
if (epfd < 0) {
perror("epoll_create");
return 1;
}
int pipefd[2];
if (pipe(pipefd) < 0) {
perror("pipe");
return 1;
}
int evfd[2];
if ((evfd[0] = dup(pipefd[0])) < 0) {
perror("dup(pipefd[0])");
return 1;
}
if ((evfd[1] = dup(pipefd[1])) < 0) {
perror("dup(pipefd[1])");
return 1;
}
struct epoll_event ev;
ev.events = EPOLLOUT;
ev.data.fd = evfd[1];
if (epoll_ctl(epfd, EPOLL_CTL_ADD, ev.data.fd, &ev) < 0) {
perror("epoll_ctl<evfd[1]>");
return 1;
}
ev.events = EPOLLIN;
ev.data.fd = evfd[0];
if (epoll_ctl(epfd, EPOLL_CTL_ADD, ev.data.fd, &ev) < 0) {
perror("epoll_ctl<evfd[0]>");
return 1;
}
printf("%d %d %d %d\n", getpid(), epfd, evfd[0], evfd[1]);
fflush(stdout);
pause();
return 0;
}
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