Forgot to add usleep.c

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1602 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

urjtag/src/lib/usleep.c

@@ -0,0 +1,45 @@
+/*
+ * $Id: usleep.c 1519 2009-04-22 23:12:44Z rfhh $
+ *
+ * Copyright (C) 2009, Rutger Hofman, VU Amsterdam
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ */
+#include "sysdep.h"
+
+#ifndef HAVE_USLEEP
+
+#ifndef HAVE_NANOSLEEP
+#  error Need usleep or nanosleep
+#endif
+
+#include <time.h>
+
+#define MICRO   1000000L
+#define NANO    1000000000L
+
+int usleep (long unsigned usec)
+{
+    struct timespec req;
+
+    req.tv_sec = usec / MICRO;
+    req.tv_nsec = (usec % MICRO) * (NANO / MICRO);
+
+    return nanosleep (&req, NULL);
+}
+
+#endif