Read Example of libev in C

ev_read.c

#include <ev.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <strings.h>


void on_error(struct ev_loop * loop, ev_io * w) {
	fprintf(stderr, "Fatal error: %s\n", strerror(errno));
	ev_io_stop(loop, w); // stop ev-loop for this watcher
}


void on_read(struct ev_loop * loop, ev_io * w, int revents) {
	fprintf(stderr, "on_read!!\n");

	char buf[128];
	int bytes = read (w->fd, buf, sizeof(buf) - 1);

	if (bytes == -1) {
		if (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK) {
			// That's ok. EV-loop will call us again
			return;
		} else {
			return on_error(loop, w);
		}
	} else if (bytes == 0) {

		fprintf(stderr, "EOF catched on read\n");
		ev_io_stop(loop, w);
		return;
	} else {

		buf[bytes] = 0;
		fprintf(stderr, "Got %d bytes\n", bytes);
		printf("%s\n", buf);
		bzero(buf, sizeof(buf));
	}
}


int main(int argc, char const *argv[])
{

	int fin  = open("loop.c", O_RDONLY | O_NONBLOCK);

	struct ev_loop * loop = ev_default_loop(0);

	ev_io inw; // input-watcher
	ev_init(&inw, on_read);
	ev_io_set(&inw, fin, EV_READ);
	ev_io_start(loop, &inw);

	ev_loop(loop, 0); // start ev-loop

	fprintf(stderr, "EV-Loop stoped\n");

	return 0;
}