implement posix_madvise
Bug: 18472477
Change-Id: I8183de6c281acf69ed5f7f88351b056b9827b162
diff --git a/libc/Android.mk b/libc/Android.mk
index 2270dc6..f04cf5c 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -153,6 +153,7 @@
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 0000000..d77be01
--- /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 939a1de..25887be 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 09bf0d9..1663222 100644
--- a/libc/include/sys/mman.h
+++ b/libc/include/sys/mman.h
@@ -43,6 +43,12 @@
#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 mincore(void*, size_t, unsigned char*);
+extern int posix_madvise(void*, size_t, int);
+
__END_DECLS
#endif /* _SYS_MMAN_H_ */