===================================================================
RCS file: /cvs/mandoc/Attic/test-mmap.c,v
retrieving revision 1.1
retrieving revision 1.6
diff -u -p -r1.1 -r1.6
--- mandoc/Attic/test-mmap.c	2011/05/26 20:36:21	1.1
+++ mandoc/Attic/test-mmap.c	2015/10/06 18:32:20	1.6
@@ -1,9 +1,9 @@
+#include <sys/types.h>
 #include <sys/mman.h>
+#include <stddef.h>
 
 int
-main(int argc, char **argv)
+main(void)
 {
-
-	mmap(0, 0, PROT_READ, MAP_FILE|MAP_SHARED, -1, 0);
-	return 0;
+	return mmap(NULL, 1, PROT_READ, MAP_SHARED, -1, 0) != MAP_FAILED;
 }