systemtime: Use gettimeofday if POSIX timers not available

1 files changed, 25 insertions, 12 deletions

diff --git a/src/systemtime.c b/src/systemtime.c
index abbb5ae..12b74cc 100644
--- a/src/systemtime.c
+++ b/src/systemtime.c
@@ -14,13 +14,17 @@
    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>
+   Copyright (c) 2010-2014  Jon Lund Steffensen <jonlst@gmail.com>
 */
 
 #include <stdio.h>
 
 #ifndef _WIN32
-# include <time.h>
+# ifdef _POSIX_TIMERS
+#  include <time.h>
+# else
+#  include <sys/time.h>
+# endif
 #endif
 
 #include "systemtime.h"
@@ -28,7 +32,16 @@
 int
 systemtime_get_time(double *t)
 {
-#ifndef _WIN32
+#if defined(_WIN32) /* Windows */
+	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;
+#elif defined(_POSIX_TIMERS) /* POSIX timers */
 	struct timespec now;
 	int r = clock_gettime(CLOCK_REALTIME, &now);
 	if (r < 0) {
@@ -37,16 +50,16 @@ systemtime_get_time(double *t)
 	}
 
 	*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;
+#else /* other platforms */
+	struct timeval now;
+	int r = gettimeofday(&now, NULL);
+	if (r < 0) {
+		perror("gettimeofday");
+		return -1;
+	}
 
-	/* FILETIME is tenths of microseconds since 1601-01-01 UTC */
-	*t = (i.QuadPart / 10000000.0) - 11644473600.0;
-#endif /* _WIN32 */
+	*t = now.tv_sec + (now.tv_usec / 1000000.0);
+#endif
 
 	return 0;
 }