diff options
| -rw-r--r-- | base/test_file_util_mac.cc | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/base/test_file_util_mac.cc b/base/test_file_util_mac.cc index 4df71a5..05e57c4 100644 --- a/base/test_file_util_mac.cc +++ b/base/test_file_util_mac.cc @@ -4,14 +4,32 @@ #include "base/test_file_util.h" +#include <sys/mman.h> +#include <errno.h> #include "base/logging.h" +#include "base/file_util.h" namespace file_util { bool EvictFileFromSystemCache(const FilePath& file) { - // There is no way that we can think of to dump something from the UBC. You - // can add something so when you open it, it doesn't go in, but that won't - // work here. + // There aren't any really direct ways to purge a file from the UBC. From + // talking with Amit Singh, the safest is to mmap the file with MAP_FILE (the + // default) + MAP_SHARED, then do an msync to invalidate the memory. The next + // open should then have to load the file from disk. + + file_util::MemoryMappedFile mapped_file; + if (!mapped_file.Initialize(file)) { + DLOG(WARNING) << "failed to memory map " << file.value(); + return false; + } + + if (msync(const_cast<uint8*>(mapped_file.data()), mapped_file.length(), + MS_INVALIDATE) != 0) { + DLOG(WARNING) << "failed to invalidate memory map of " << file.value() + << ", errno: " << errno; + return false; + } + return true; } |