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Merge "implement posix_madvise"

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This commit is contained in:
Yabin Cui
2014-12-04 21:30:43 +00:00
committed by Gerrit Code Review
parent e3e3feaf91 5afae64a1b
commit 295bc2b970
6 changed files with 98 additions and 4 deletions
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1
libc/Android.mk
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@@ -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 \

42
libc/bionic/posix_madvise.cpp Normal file
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@@ -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);
}

2
libc/include/machine/posix_limits.h
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@@ -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

8
libc/include/sys/mman.h
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@@ -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_ */