1 // Copyright 2011 The Chromium Authors
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 #include "build/build_config.h"
13
14 #if BUILDFLAG(IS_ANDROID)
15 #include <asm/unistd.h>
16 #include <errno.h>
17 #include <linux/fadvise.h>
18 #include <sys/syscall.h>
19 #endif
20
21 #include "base/files/file_path.h"
22 #include "base/files/scoped_file.h"
23 #include "base/notimplemented.h"
24
25 namespace base {
26
27 // Inconveniently, the NDK doesn't provide for posix_fadvise
28 // until native API level = 21, which we don't use yet, so provide a wrapper, at
29 // least on ARM32
30 #if BUILDFLAG(IS_ANDROID) && __ANDROID_API__ < 21
31
32 namespace {
posix_fadvise(int fd,off_t offset,off_t len,int advice)33 int posix_fadvise(int fd, off_t offset, off_t len, int advice) {
34 #if defined(ARCH_CPU_ARMEL)
35 // Note that the syscall argument order on ARM is different from the C
36 // function; this is helpfully documented in the Linux posix_fadvise manpage.
37 return syscall(__NR_arm_fadvise64_64, fd, advice,
38 0, // Upper 32-bits for offset
39 offset,
40 0, // Upper 32-bits for length
41 len);
42 #endif
43 NOTIMPLEMENTED();
44 return ENOSYS;
45 }
46
47 } // namespace
48
49 #endif // BUILDFLAG(IS_ANDROID)
50
EvictFileFromSystemCache(const FilePath & file)51 bool EvictFileFromSystemCache(const FilePath& file) {
52 ScopedFD fd(open(file.value().c_str(), O_RDONLY));
53 if (!fd.is_valid())
54 return false;
55 if (fdatasync(fd.get()) != 0)
56 return false;
57 if (posix_fadvise(fd.get(), 0, 0, POSIX_FADV_DONTNEED) != 0)
58 return false;
59 return true;
60 }
61
62 } // namespace base
63