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 f43233d8637d87a372d9a2325de9a3d9b1df3e7e..eac5bdbc85b611f3235ab8c64e90a15b91435cb2 100644 (file)
--- 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 (file)
index 0000000..e7bd9ce
--- /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 (file)
index 0000000..e5a5310
--- /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 */