From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Thu, 12 Nov 2015 21:42:05 +0000 (-0500)
Subject: Tests: Add a test utils library
X-Git-Tag: v2.8.0-rc1~213
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=0458ed8c7f5c46e1fb56c8cb920ddbbc7adda8a8;p=lttng-tools.git

Tests: Add a test utils library

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/tests/utils/Makefile.am b/tests/utils/Makefile.am
index f43233d86..eac5bdbc8 100644
--- a/tests/utils/Makefile.am
+++ b/tests/utils/Makefile.am
@@ -1,7 +1,10 @@
-SUBDIRS = tap testapp
+SUBDIRS = . tap testapp
 
 EXTRA_DIST = utils.sh test_utils.py babelstats.pl warn_lttng_processes.sh
 dist_noinst_SCRIPTS = utils.sh test_utils.py babelstats.pl warn_lttng_processes.sh
+noinst_LTLIBRARIES = libtestutils.la
+
+libtestutils_la_SOURCES = utils.c utils.h
 
 all-local:
 	@if [ x"$(srcdir)" != x"$(builddir)" ]; then \
diff --git a/tests/utils/utils.c b/tests/utils/utils.c
new file mode 100644
index 000000000..e7bd9ce9f
--- /dev/null
+++ b/tests/utils/utils.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) - 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation; version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <stdint.h>
+#include <time.h>
+#include <assert.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+
+#define NSEC_PER_SEC 1000000000ULL
+#define NSEC_PER_USEC 1000ULL
+
+static inline
+int64_t elapsed_time_ns(struct timespec *t1, struct timespec *t2)
+{
+	struct timespec delta;
+
+	assert(t1 && t2);
+	delta.tv_sec = t2->tv_sec - t1->tv_sec;
+	delta.tv_nsec = t2->tv_nsec - t1->tv_nsec;
+	return ((int64_t) NSEC_PER_SEC * (int64_t) delta.tv_sec) +
+			(int64_t) delta.tv_nsec;
+}
+
+int usleep_safe(useconds_t usec)
+{
+	int ret = 0;
+	struct timespec t1, t2;
+	int64_t time_remaining_ns = (int64_t) usec * (int64_t) NSEC_PER_USEC;
+
+	ret = clock_gettime(CLOCK_MONOTONIC, &t1);
+	if (ret) {
+		ret = -1;
+		perror("clock_gettime");
+		goto end;
+	}
+
+	while (time_remaining_ns > 0) {
+		ret = usleep(time_remaining_ns / (int64_t) NSEC_PER_USEC);
+		if (ret && errno != EINTR) {
+			perror("usleep");
+			goto end;
+		}
+
+		ret = clock_gettime(CLOCK_MONOTONIC, &t2);
+		if (ret) {
+			perror("clock_gettime");
+			goto end;
+		}
+
+		time_remaining_ns -= elapsed_time_ns(&t1, &t2);
+	}
+end:
+	return ret;
+}
diff --git a/tests/utils/utils.h b/tests/utils/utils.h
new file mode 100644
index 000000000..e5a5310d9
--- /dev/null
+++ b/tests/utils/utils.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) - 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation; version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef TEST_UTILS_H
+#define TEST_UTILS_H
+
+int usleep_safe(useconds_t usec);
+
+#endif /* TEST_UTILS_H */