Add posix_fadvise(3).

(cherry-pick of 00008263782e484020420c606f7d145fe7d0a4d8.)

Bug: 12449798
Change-Id: I07cbf3f670a0d1304b68148325a774f266b5c433

1 files changed, 51 insertions, 0 deletions

diff --git a/libc/bionic/posix_fadvise.cpp b/libc/bionic/posix_fadvise.cpp
new file mode 100644
index 000000000..3a74af363
--- /dev/null
+++ b/libc/bionic/posix_fadvise.cpp
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <fcntl.h>
+
+#include "private/ErrnoRestorer.h"
+
+extern "C" int __arm_fadvise64_64(int, int, off64_t, off64_t);
+extern "C" int __fadvise64(int, off64_t, off64_t, int);
+
+// No architecture actually has the 32-bit off_t system call.
+int posix_fadvise(int fd, off_t offset, off_t length, int advice) {
+  return posix_fadvise64(fd, offset, length, advice);
+}
+
+#if defined(__arm__)
+int posix_fadvise64(int fd, off64_t offset, off64_t length, int advice) {
+  ErrnoRestorer errno_restorer;
+  return (__arm_fadvise64_64(fd, advice, offset, length) == 0) ? 0 : errno;
+}
+#else
+int posix_fadvise64(int fd, off64_t offset, off64_t length, int advice) {
+  ErrnoRestorer errno_restorer;
+  return (__fadvise64(fd, offset, length, advice) == 0) ? 0 : errno;
+}
+#endif