timerfd.c
vico.chern_qq.com (Vico Chen)
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	vico.chern_qq.com
	Sep 4 2023, 3:28 AM

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timerfd.c
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	#include <signal.h>
	#include <assert.h>
	#include <stddef.h>
	#include <stdio.h>
	#include <errno.h>
	#include <signal.h>
	#include <stdlib.h>
	#include <stdint.h>
	#include <stdbool.h>
	#include <string.h>
	#include <fcntl.h>
	#include <sys/socket.h>
	#include <sys/un.h>
	#include <sys/epoll.h>
	#include <sys/signalfd.h>
	#include <sys/timerfd.h>
	#include <unistd.h>
	#include <poll.h>

	#include <pthread.h>


	int
	main(int argc, char **argv)
	{
	int counter = 0;
	int n = 0;
	int err = 0;
	int tmfd = 0;
	struct itimerspec its;
	struct pollfd pd;

	printf("TFD_CLOEXEC=%x, TFD_NONBLOCK=%x.\n", TFD_CLOEXEC, TFD_NONBLOCK);
	tmfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC \| TFD_NONBLOCK);
	//tmfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
	if (tmfd < 0) {
	printf("tmfd=%d\n", tmfd);
	return -1;
	}

	its.it_interval.tv_sec = 0;
	its.it_interval.tv_nsec = 0;
	its.it_value.tv_sec = 1;
	its.it_value.tv_nsec = 1;
	err = timerfd_settime(tmfd, 0, &its, NULL);
	printf("err=%d...\n", err);

	pd.fd = tmfd;
	pd.events = POLL_IN;
	pd.revents = 0;

	do {
	pd.revents = 0;
	printf("Polling...\n");
	n = poll(&pd, 1, -1);
	if (n < 0)
	continue;
	++counter;
	printf("Get one: #%d, n=%d, revents=0x%x\n", counter, n, pd.revents);
	timerfd_settime(tmfd, 0, &its, NULL);
	} while(1);
	}