1 files changed, 52 insertions, 0 deletions
diff --git a/src/systemtime.c b/src/systemtime.c
new file mode 100644
index 0000000..abbb5ae
--- /dev/null
+++ b/src/systemtime.c
@@ -0,0 +1,52 @@
+/* systemtime.c -- Portable system time source
+   This file is part of Redshift.
+
+   Redshift is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Redshift 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Redshift.  If not, see <http://www.gnu.org/licenses/>.
+
+   Copyright (c) 2010  Jon Lund Steffensen <jonlst@gmail.com>
+*/
+
+#include <stdio.h>
+
+#ifndef _WIN32
+# include <time.h>
+#endif
+
+#include "systemtime.h"
+
+int
+systemtime_get_time(double *t)
+{
+#ifndef _WIN32
+	struct timespec now;
+	int r = clock_gettime(CLOCK_REALTIME, &now);
+	if (r < 0) {
+		perror("clock_gettime");
+		return -1;
+	}
+
+	*t = now.tv_sec + (now.tv_nsec / 1000000000.0);
+#else /* _WIN32 */
+	FILETIME now;
+	ULARGE_INTEGER i;
+	GetSystemTimeAsFileTime(&now);
+	i.LowPart = now.dwLowDateTime;
+	i.HighPart = now.dwHighDateTime;
+
+	/* FILETIME is tenths of microseconds since 1601-01-01 UTC */
+	*t = (i.QuadPart / 10000000.0) - 11644473600.0;
+#endif /* _WIN32 */
+
+	return 0;
+}