datapath: Rename linux-2.6 and compat-2.6 directories.

[sliver-openvswitch.git] / datapath / linux / compat / time.c

diff --git a/datapath/linux/compat/time.c b/datapath/linux/compat/time.c
new file mode 100644 (file)
index 0000000..ad3ee94
--- /dev/null
+++ b/datapath/linux/compat/time.c
@@ -0,0 +1,39 @@
+#include <linux/time.h>
+
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
+
+/* "set_normalized_timespec" is defined but not exported in kernels
+ * before 2.6.26. */
+
+/**
+ * set_normalized_timespec - set timespec sec and nsec parts and normalize
+ *
+ * @ts:         pointer to timespec variable to be set
+ * @sec:        seconds to set
+ * @nsec:       nanoseconds to set
+ *
+ * Set seconds and nanoseconds field of a timespec variable and
+ * normalize to the timespec storage format
+ *
+ * Note: The tv_nsec part is always in the range of
+ *      0 <= tv_nsec < NSEC_PER_SEC
+ * For negative values only the tv_sec field is negative !
+ */
+void set_normalized_timespec(struct timespec *ts,
+                   time_t sec, long nsec)
+{
+       while (nsec >= NSEC_PER_SEC) {
+               nsec -= NSEC_PER_SEC;
+               ++sec;
+       }
+       while (nsec < 0) {
+               nsec += NSEC_PER_SEC;
+               --sec;
+       }
+       ts->tv_sec = sec;
+       ts->tv_nsec = nsec;
+}
+
+#endif /* linux kernel < 2.6.26 */