Add test case for ASHMEM_PURGE_ALL_CACHES ioctl.

1 files changed, 40 insertions, 0 deletions

diff --git a/ashmemtest-basic/ashmemtest.c b/ashmemtest-basic/ashmemtest.c
index 23d83d1..0b27b2d 100644
--- a/ashmemtest-basic/ashmemtest.c
+++ b/ashmemtest-basic/ashmemtest.c
@@ -481,6 +481,45 @@ void ashmem_prot (char *ashmemdev, size_t pagesize)
     printf ("%d [%s]: test passed\n", testno, __func__);
 }
 
+void ashmem_purge (char *ashmemdev, size_t pagesize)
+{
+    void *mem;
+    struct ashmem_pin pin;
+    int i, fd, ret, size = pagesize * 16;
+
+    testno++;
+
+    /* allocate 16 pages */
+    fd = test_open (ashmemdev, O_RDWR);
+    ret = ioctl (fd, ASHMEM_SET_SIZE, size);
+    if (ret < 0)
+	fatal (errno, "can't allocate %ld-bytes read-only region");
+    mem = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+    if (mem == MAP_FAILED)
+	fatal (errno, "can't map ashmem region");
+    /* unpin all odd pages */
+    for (i = 1; i < 16; i += 2) {
+	pin.offset = i * pagesize;
+	pin.len = pagesize;
+	ret = ioctl (fd, ASHMEM_UNPIN, &pin);
+	if (ret < 0)
+	    fatal (errno, "can't unpin page %d of 16", i);
+    }
+    /* purge should release 8 pages */
+    ret = ioctl (fd, ASHMEM_PURGE_ALL_CACHES);
+    if (ret != 8) {
+	if (ret < 0)
+	    fatal (errno, "can't purge caches");
+	else
+	    fatal (0, "purge %d pages, but expect 8", ret);
+    }
+    if (munmap (mem, size))
+	fatal (errno, "can't unmap ashmem region");
+    test_close (fd);
+
+    printf ("%d [%s]: test passed\n", testno, __func__);
+}
+
 int main(int argc, char *argv[])
 {
     char ashmemdev[64];
@@ -495,5 +534,6 @@ int main(int argc, char *argv[])
     ashmem_size (ashmemdev, pagesize);
     ashmem_mmap (ashmemdev, pagesize);
     ashmem_prot (ashmemdev, pagesize);
+    ashmem_purge (ashmemdev, pagesize);
     return 0;
 }