support even older versions of mingw (as found on some Debian distros) that lack usleep/nanosleep, but have _sleep

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1828 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

urjtag/ChangeLog

@@ -1,3 +1,9 @@
+2010-08-18  Mike Frysinger  <vapier@gentoo.org>
+
+  * configure.ac (AC_CHECK_FUNCS): Check for _sleep.
+  * src/lib/usleep.c: Support a fuzzy version of usleep based on old mingw
+    _sleep functions.
+
 2010-08-16  Mike Frysinger  <vapier@gentoo.org>
 
   * src/tap/detect.c (urj_tap_detect_parts): Include paths to data files when

urjtag/configure.ac

@@ -116,6 +116,7 @@ else
 fi
 
 AC_CHECK_FUNCS(m4_flatten([
+	_sleep
 	geteuid
 	getuid
 	nanosleep

urjtag/src/lib/usleep.c

@@ -23,9 +23,7 @@
 
 #ifndef HAVE_USLEEP
 
-#ifndef HAVE_NANOSLEEP
-#  error Need usleep or nanosleep
-#endif
+#ifdef HAVE_NANOSLEEP
 
 #include <time.h>
 
@@ -42,4 +40,17 @@ int usleep (long unsigned usec)
     return nanosleep (&req, NULL);
 }
 
+#elif defined(HAVE__SLEEP)
+
+/* Not exact, but close enough */
+int usleep (long unsigned usec)
+{
+    _sleep (usec / 1000);
+    return 0;
+}
+
+#else
+# error "Need sleep, usleep, or nanosleep"
+#endif
+
 #endif