1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/test/test_file_util.h"
6
7 #include <fcntl.h>
8 #include <sys/stat.h>
9 #include <sys/types.h>
10 #include <unistd.h>
11
12 #if defined(OS_ANDROID)
13 #include <asm/unistd.h>
14 #include <errno.h>
15 #include <linux/fadvise.h>
16 #include <sys/syscall.h>
17 #endif
18
19 #include "base/files/file_path.h"
20 #include "base/files/scoped_file.h"
21
22 namespace base {
23
24 // Inconveniently, the NDK doesn't provide for posix_fadvise
25 // until native API level = 21, which we don't use yet, so provide a wrapper, at
26 // least on ARM32
27 #if defined(OS_ANDROID) && __ANDROID_API__ < 21
28
29 namespace {
posix_fadvise(int fd,off_t offset,off_t len,int advice)30 int posix_fadvise(int fd, off_t offset, off_t len, int advice) {
31 #if defined(ARCH_CPU_ARMEL)
32 // Note that the syscall argument order on ARM is different from the C
33 // function; this is helpfully documented in the Linux posix_fadvise manpage.
34 return syscall(__NR_arm_fadvise64_64, fd, advice,
35 0, // Upper 32-bits for offset
36 offset,
37 0, // Upper 32-bits for length
38 len);
39 #endif
40 NOTIMPLEMENTED();
41 return ENOSYS;
42 }
43
44 } // namespace
45
46 #endif // OS_ANDROID
47
EvictFileFromSystemCache(const FilePath & file)48 bool EvictFileFromSystemCache(const FilePath& file) {
49 ScopedFD fd(open(file.value().c_str(), O_RDONLY));
50 if (!fd.is_valid())
51 return false;
52 if (fdatasync(fd.get()) != 0)
53 return false;
54 if (posix_fadvise(fd.get(), 0, 0, POSIX_FADV_DONTNEED) != 0)
55 return false;
56 return true;
57 }
58
59 } // namespace base
60