implement posix_madvise
Bug: 18472477
Change-Id: I8183de6c281acf69ed5f7f88351b056b9827b162
diff --git a/tests/sys_mman_test.cpp b/tests/sys_mman_test.cpp
index 75ccfa3..b0e40fd 100644
--- a/tests/sys_mman_test.cpp
+++ b/tests/sys_mman_test.cpp
@@ -172,3 +172,46 @@
ASSERT_STREQ(NEWPAGE2_MSG, buf);
ASSERT_STREQ(END_MSG, buf+pagesize-sizeof(END_MSG));
}
+
+TEST(sys_mman, posix_madvise) {
+ TemporaryFile tempfile;
+ size_t pagesize = sysconf(_SC_PAGESIZE);
+ char buf[pagesize];
+
+ // Prepare environment.
+ ASSERT_EQ(static_cast<ssize_t>(pagesize), write(tempfile.fd, buf, pagesize));
+ void* map = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, tempfile.fd, 0);
+ ASSERT_NE(MAP_FAILED, map);
+
+ // Verify different options of posix_madvise.
+ ASSERT_EQ(0, posix_madvise(map, pagesize, POSIX_MADV_NORMAL));
+ ASSERT_EQ(0, posix_madvise(map, pagesize, POSIX_MADV_SEQUENTIAL));
+ ASSERT_EQ(0, posix_madvise(map, pagesize, POSIX_MADV_RANDOM));
+ ASSERT_EQ(0, posix_madvise(map, pagesize, POSIX_MADV_WILLNEED));
+
+ ASSERT_EQ(0, munmap(map, pagesize));
+}
+
+// Verify that memory can still access after posix_madvise(POSIX_MADV_DONTNEED).
+// We should test on MAP_ANONYMOUS memory to verify whether the memory is discarded,
+// because the content of non MAP_ANONYMOUS memory can be reread from file.
+TEST(sys_mman, posix_madvise_POSIX_MADV_DONTNEED) {
+ size_t pagesize = sysconf(_SC_PAGESIZE);
+
+ void* map = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ ASSERT_NE(MAP_FAILED, map);
+
+ int* int_ptr = reinterpret_cast<int*>(map);
+ for (int i = 0; i < static_cast<int>(pagesize / sizeof(int)); ++i) {
+ *int_ptr++ = i;
+ }
+
+ ASSERT_EQ(0, posix_madvise(map, pagesize, POSIX_MADV_DONTNEED));
+
+ int_ptr = reinterpret_cast<int*>(map);
+ for (int i = 0; i < static_cast<int>(pagesize / sizeof(int)); ++i) {
+ ASSERT_EQ(i, *int_ptr++);
+ }
+
+ ASSERT_EQ(0, munmap(map, pagesize));
+}