test/time: Add tst-timerfd

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

test/.gitignore

@@ -288,6 +288,7 @@ time/tst-futimens1
 time/tst-mktime
 time/tst-mktime3
 time/tst-strptime2
+time/tst-timerfd
 time/tst_wcsftime
 tls/tst-tls[1-9]
 tls/tst-tls1[0-8]

test/time/tst-timerfd.c

@@ -0,0 +1,71 @@
+/* vi: set sw=4 ts=4 sts=4: */
+/*
+ * timerfd test for uClibc
+ * Copyright (C) 2012 by Kevin Cernekee <cernekee@gmail.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <error.h>
+#include <signal.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <time.h>
+#include <sys/timerfd.h>
+#include <sys/fcntl.h>
+
+static int
+do_test(void)
+{
+	int fd, ret, result = 0;
+	struct itimerspec s;
+	uint64_t val;
+	time_t start, now;
+
+	fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+	if (fd < 0) {
+		perror("timerfd() failed");
+		result = 1;
+	}
+	s.it_value.tv_sec = 1;
+	s.it_value.tv_nsec = 0;
+	s.it_interval.tv_sec = 0;
+	s.it_interval.tv_nsec = 0;
+	timerfd_settime(fd, 0, &s, NULL);
+	start = time(NULL);
+
+	/* this should return immediately with EAGAIN due to TFD_NONBLOCK */
+	ret = read(fd, &val, sizeof(val));
+	if (ret != -1 || errno != EAGAIN) {
+		error(0, 0, "first read() returned %d", ret);
+		result = 1;
+	}
+
+	/* let the timer expire, then check it again */
+	do {
+		now = time(NULL);
+	} while (now - start < 2);
+
+	ret = read(fd, &val, sizeof(val));
+	if (ret != sizeof(val)) {
+		error(0, 0, "second read() returned %d", ret);
+		result = 1;
+	}
+
+	/* we are expecting a single expiration, since it_interval is 0 */
+	if (val != 1) {
+		error(0, 0, "wrong number of expirations: %" PRIx64, val);
+		result = 1;
+	}
+
+	return result;
+}
+
+#define TIMEOUT 5
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"