util/env_posix_test.cc

   1 // Copyright (c) 2011 The LevelDB 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. See the AUTHORS file for names of contributors.
   4
   5 #include "leveldb/env.h"
   6
   7 #include "port/port.h"
   8 #include "util/testharness.h"
   9 #include "util/env_posix_test_helper.h"
  10
  11 namespace leveldb {
  12
  13 static const int kDelayMicros = 100000;
  14 static const int kReadOnlyFileLimit = 4;
  15 static const int kMMapLimit = 4;
  16
  17 class EnvPosixTest {
  18  public:
  19   Env* env_;
  20   EnvPosixTest() : env_(Env::Default()) { }
  21
  22   static void SetFileLimits(int read_only_file_limit, int mmap_limit) {
  23     EnvPosixTestHelper::SetReadOnlyFDLimit(read_only_file_limit);
  24     EnvPosixTestHelper::SetReadOnlyMMapLimit(mmap_limit);
  25   }
  26 };
  27
  28 TEST(EnvPosixTest, TestOpenOnRead) {
  29   // Write some test data to a single file that will be opened |n| times.
  30   std::string test_dir;
  31   ASSERT_OK(env_->GetTestDirectory(&test_dir));
  32   std::string test_file = test_dir + "/open_on_read.txt";
  33
  34   FILE* f = fopen(test_file.c_str(), "w");
  35   ASSERT_TRUE(f != NULL);
  36   const char kFileData[] = "abcdefghijklmnopqrstuvwxyz";
  37   fputs(kFileData, f);
  38   fclose(f);
  39
  40   // Open test file some number above the sum of the two limits to force
  41   // open-on-read behavior of POSIX Env leveldb::RandomAccessFile.
  42   const int kNumFiles = kReadOnlyFileLimit + kMMapLimit + 5;
  43   leveldb::RandomAccessFile* files[kNumFiles] = {0};
  44   for (int i = 0; i < kNumFiles; i++) {
  45     ASSERT_OK(env_->NewRandomAccessFile(test_file, &files[i]));
  46   }
  47   char scratch;
  48   Slice read_result;
  49   for (int i = 0; i < kNumFiles; i++) {
  50     ASSERT_OK(files[i]->Read(i, 1, &read_result, &scratch));
  51     ASSERT_EQ(kFileData[i], read_result[0]);
  52   }
  53   for (int i = 0; i < kNumFiles; i++) {
  54     delete files[i];
  55   }
  56   ASSERT_OK(env_->DeleteFile(test_file));
  57 }
  58
  59 }  // namespace leveldb
  60
  61 int main(int argc, char** argv) {
  62   // All tests currently run with the same read-only file limits.
  63   leveldb::EnvPosixTest::SetFileLimits(leveldb::kReadOnlyFileLimit,
  64                                        leveldb::kMMapLimit);
  65   return leveldb::test::RunAllTests();
  66 }