1 files changed, 52 insertions, 0 deletions
diff --git a/tests/017/mmap.tl b/tests/017/mmap.tl
new file mode 100644
index 00000000..aab86a0e
--- /dev/null
+++ b/tests/017/mmap.tl
@@ -0,0 +1,52 @@
+(load "../common")
+
+(defun parent (wp mm)
+  (with-stream (s (open-fileno wp "w"))
+    (each ((i 0..1024))
+      (set [mm i] i))
+    (put-char #\X s)))
+
+(defun child (rp mm)
+  (let ((s (open-fileno rp "r")))
+    (assert (eq (get-char s) #\X))
+    (each ((i 0..1024))
+      (assert (eql [mm i] i)))))
+
+(let ((mm (mmap (ffi uint32) 4096
+                (logior prot-read prot-write)
+                (logior map-anon map-shared))))
+  (tree-bind (rp . wp) (pipe)
+    (match-ecase (fork)
+      (0 (child rp mm)
+         (exit t))
+      (-1 (error "fork failed"))
+      (@pid (parent wp mm)
+            (tree-bind (p . s) (wait pid)
+              (unless (zerop s)
+                (error "child failed")))))))
+
+(assert (plusp page-size))
+
+(let* ((mk-rnd-buf (opip (expt 256 page-size) rand buf-uint))
+       (rndbuf0 [mk-rnd-buf])
+       (rndbuf1 [mk-rnd-buf])
+       (fname "rand.bin"))
+  (unwind-protect
+    (progn
+      (file-put-buf fname rndbuf0)
+      (let* ((mm (mmap (ffi uchar) page-size
+                       (logior prot-read prot-write)
+                       (logior map-shared)
+                       fname)))
+        (each ((i 0..page-size))
+          (assert (eq [rndbuf0 i] [mm i]))
+          (set [mm i] [rndbuf1 i]))
+        (msync mm ms-sync)
+        (assert (equal (file-get-buf fname) rndbuf1))
+        (each ((i 0..page-size))
+          (set [mm i] [rndbuf0 i]))
+        (munmap mm))
+      (assert (equal (file-get-buf fname) rndbuf0)))
+    (remove-path fname)))
+
+(assert (null (ignerr (mmap (ffi char) 4096 prot-read map-anon))))