1 files changed, 75 insertions, 0 deletions
diff --git a/src/port/win32gettimeofday.c b/src/port/win32gettimeofday.c
new file mode 100644
index 0000000..1e00f7e
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+++ b/src/port/win32gettimeofday.c
@@ -0,0 +1,75 @@
+/*
+ * win32gettimeofday.c
+ *	  Win32 gettimeofday() replacement
+ *
+ * src/port/win32gettimeofday.c
+ *
+ * Copyright (c) 2003 SRA, Inc.
+ * Copyright (c) 2003 SKC, Inc.
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose, without fee, and without a
+ * written agreement is hereby granted, provided that the above
+ * copyright notice and this paragraph and the following two
+ * paragraphs appear in all copies.
+ *
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
+ * LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
+ * DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS
+ * IS" BASIS, AND THE AUTHOR HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ */
+
+#include "c.h"
+
+#include <sysinfoapi.h>
+
+#include <sys/time.h>
+
+/* FILETIME of Jan 1 1970 00:00:00, the PostgreSQL epoch */
+static const unsigned __int64 epoch = UINT64CONST(116444736000000000);
+
+/*
+ * FILETIME represents the number of 100-nanosecond intervals since
+ * January 1, 1601 (UTC).
+ */
+#define FILETIME_UNITS_PER_SEC	10000000L
+#define FILETIME_UNITS_PER_USEC 10
+
+
+/*
+ * timezone information is stored outside the kernel so tzp isn't used anymore.
+ *
+ * Note: this function is not for Win32 high precision timing purposes. See
+ * elapsed_time().
+ */
+int
+gettimeofday(struct timeval *tp, void *tzp)
+{
+	FILETIME	file_time;
+	ULARGE_INTEGER ularge;
+
+	/*
+	 * POSIX declines to define what tzp points to, saying "If tzp is not a
+	 * null pointer, the behavior is unspecified".  Let's take this
+	 * opportunity to verify that noplace in Postgres tries to use any
+	 * unportable behavior.
+	 */
+	Assert(tzp == NULL);
+
+	GetSystemTimePreciseAsFileTime(&file_time);
+	ularge.LowPart = file_time.dwLowDateTime;
+	ularge.HighPart = file_time.dwHighDateTime;
+
+	tp->tv_sec = (long) ((ularge.QuadPart - epoch) / FILETIME_UNITS_PER_SEC);
+	tp->tv_usec = (long) (((ularge.QuadPart - epoch) % FILETIME_UNITS_PER_SEC)
+						  / FILETIME_UNITS_PER_USEC);
+
+	return 0;
+}