Index: example/io/eventfds.c
===================================================================
--- example/io/eventfds.c	(revision 33608cb54b8ea1ec847090d2cae1dd35145c0f9b)
+++ example/io/eventfds.c	(revision 33608cb54b8ea1ec847090d2cae1dd35145c0f9b)
@@ -0,0 +1,116 @@
+/*
+This is a simple "eventfd" example that uses io_uring
+It demonstrates that reads work as expected on eventfds.
+It uses liburing for simplicity.
+*/
+
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <fcntl.h>
+#include <liburing.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/eventfd.h>
+
+struct io_uring ring;
+
+
+int main(int argc,  char * argv[]) {
+      int fd = eventfd(0, 0);
+      if(fd < 0) {
+            printf("Could not open event fd.\n");
+            return 2;
+      }
+
+      /* prep the array */
+	char buf[sizeof(uint64_t)] = { 0 };
+      struct iovec iov = { buf, 8 };
+
+	{
+            /* Do one write so we can compare blocking behaviour */
+		eventfd_t val;
+		val = 1;
+		eventfd_write( fd, val );
+	}
+
+      /* init liburing */
+      io_uring_queue_init(256, &ring, 0);
+
+      /* declare required structs */
+      struct io_uring_sqe * sqe;
+      struct io_uring_cqe * cqe;
+
+      /* get an sqe and fill in a READ operation */
+      sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_read(sqe, fd, buf, 8, 0);
+
+      sqe->user_data = fd;
+
+      /* tell the kernel we have an sqe ready for consumption */
+      io_uring_submit(&ring);
+
+	printf("First wait\n");
+
+      /* wait for the sqe to complete */
+      int ret = io_uring_wait_cqe(&ring, &cqe);
+
+      /* read and process cqe event */
+      if(ret == 0) {
+            signed int len = cqe->res;
+            io_uring_cqe_seen(&ring, cqe);
+		printf("%d ", len);
+            if(len > 0) {
+                  printf("%.*s", len, buf);
+            }
+            else if( len < 0 ) {
+                  fprintf(stderr, "readv/read returned error : %s\n", strerror(-len));
+            }
+      }
+      else {
+            printf("%d\n", ret);
+            io_uring_cqe_seen(&ring, cqe);
+      }
+
+      /* ============================================ */
+      /* DO it again so the we can compare behaviour. */
+      /* ============================================ */
+
+      /* get an sqe and fill in a READ operation */
+      sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_read(sqe, fd, buf, 8, 0);
+
+      sqe->user_data = fd;
+
+	printf("Second wait\n");
+
+      /* tell the kernel we have an sqe ready for consumption */
+      io_uring_submit(&ring);
+
+      /* wait for the sqe to complete */
+      ret = io_uring_wait_cqe(&ring, &cqe);
+
+      /* read and process cqe event */
+      if(ret == 0) {
+            signed int len = cqe->res;
+            io_uring_cqe_seen(&ring, cqe);
+		printf("%d ", len);
+            if(len > 0) {
+                  printf("%.*s", len, buf);
+            }
+            else if( len < 0 ) {
+                  fprintf(stderr, "readv/read returned error : %s\n", strerror(-len));
+            }
+      }
+      else {
+            printf("%d\n", ret);
+            io_uring_cqe_seen(&ring, cqe);
+      }
+
+      io_uring_queue_exit(&ring);
+
+      close(fd);
+}