Merge "implement posix_madvise"

4 files changed, 52 insertions, 1 deletions

diff --git a/libc/Android.mk b/libc/Android.mk
index 2270dc607..f04cf5cd5 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -153,6 +153,7 @@ libc_bionic_src_files := \
     bionic/poll.cpp \
     bionic/posix_fadvise.cpp \
     bionic/posix_fallocate.cpp \
+    bionic/posix_madvise.cpp \
     bionic/posix_timers.cpp \
     bionic/pthread_atfork.cpp \
     bionic/pthread_attr.cpp \
diff --git a/libc/bionic/posix_madvise.cpp b/libc/bionic/posix_madvise.cpp
new file mode 100644
index 000000000..d77be0178
--- /dev/null
+++ b/libc/bionic/posix_madvise.cpp
@@ -0,0 +1,42 @@
+/*
+ * 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 <errno.h>
+#include <sys/mman.h>
+
+#include "private/ErrnoRestorer.h"
+
+int posix_madvise(void* addr, size_t len, int advice) {
+  ErrnoRestorer errno_restorer;
+
+  // Don't call madvise() on POSIX_MADV_DONTNEED, it will make the space not available.
+  if (advice == POSIX_MADV_DONTNEED) {
+    return 0;
+  }
+  return (madvise(addr, len, advice) == 0 ? 0 : errno);
+}
diff --git a/libc/include/machine/posix_limits.h b/libc/include/machine/posix_limits.h
index 939a1de5b..25887bef6 100644
--- a/libc/include/machine/posix_limits.h
+++ b/libc/include/machine/posix_limits.h
@@ -32,7 +32,7 @@
 
 /* Any constant values here other than -1 or 200809L are explicitly specified by POSIX.1-2008. */
 /* Keep it sorted. */
-#define _POSIX_ADVISORY_INFO        -1  /* posix_madvise() not implemented */
+#define _POSIX_ADVISORY_INFO        200809L
 #define _POSIX_AIO_LISTIO_MAX       2
 #define _POSIX_AIO_MAX              1
 #define _POSIX_ARG_MAX              4096
diff --git a/libc/include/sys/mman.h b/libc/include/sys/mman.h
index 09bf0d914..166322269 100644
--- a/libc/include/sys/mman.h
+++ b/libc/include/sys/mman.h
@@ -43,6 +43,12 @@ __BEGIN_DECLS
 #define MREMAP_MAYMOVE  1
 #define MREMAP_FIXED    2
 
+#define POSIX_MADV_NORMAL     MADV_NORMAL
+#define POSIX_MADV_RANDOM     MADV_RANDOM
+#define POSIX_MADV_SEQUENTIAL MADV_SEQUENTIAL
+#define POSIX_MADV_WILLNEED   MADV_WILLNEED
+#define POSIX_MADV_DONTNEED   MADV_DONTNEED
+
 extern void* mmap(void*, size_t, int, int, int, off_t);
 extern void* mmap64(void*, size_t, int, int, int, off64_t);
 extern int munmap(void*, size_t);
@@ -61,6 +67,8 @@ extern int munlock(const void*, size_t);
 
 extern int mincore(void*, size_t, unsigned char*);
 
+extern int posix_madvise(void*, size_t, int);
+
 __END_DECLS
 
 #endif /* _SYS_MMAN_H_ */