2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/File.h>
21 #include <boost/thread/locks.hpp>
22 #include <glog/logging.h>
23 #include <gtest/gtest.h>
25 #include <folly/String.h>
26 #include <folly/Subprocess.h>
27 #include <folly/experimental/io/FsUtil.h>
28 #include <folly/experimental/TestUtil.h>
30 using namespace folly;
31 using namespace folly::test;
34 void expectWouldBlock(ssize_t r) {
35 int savedErrno = errno;
37 EXPECT_EQ(EAGAIN, savedErrno) << errnoStr(savedErrno);
39 void expectOK(ssize_t r) {
40 int savedErrno = errno;
41 EXPECT_LE(0, r) << ": errno=" << errnoStr(savedErrno);
46 // Open a file, ensure it's indeed open for reading
50 EXPECT_NE(-1, f.fd());
51 EXPECT_EQ(1, ::read(f.fd(), &buf, 1));
53 EXPECT_EQ(-1, f.fd());
57 TEST(File, SimpleStringPiece) {
59 File f(StringPiece("/etc/hosts"));
60 EXPECT_NE(-1, f.fd());
61 EXPECT_EQ(1, ::read(f.fd(), &buf, 1));
63 EXPECT_EQ(-1, f.fd());
67 // Wrap a file descriptor, make sure that ownsFd works
68 // We'll test that the file descriptor is closed by closing the writing
69 // end of a pipe and making sure that a non-blocking read from the reading
75 int flags = ::fcntl(p[0], F_GETFL);
77 expectOK(::fcntl(p[0], F_SETFL, flags | O_NONBLOCK));
78 expectWouldBlock(::read(p[0], &buf, 1));
81 EXPECT_EQ(p[1], f.fd());
83 // Ensure that moving the file doesn't close it
86 EXPECT_EQ(p[1], f.fd());
87 File f1(std::move(f));
88 EXPECT_EQ(-1, f.fd());
89 EXPECT_EQ(p[1], f1.fd());
91 expectWouldBlock(::read(p[0], &buf, 1)); // not closed
94 EXPECT_EQ(p[1], f.fd());
96 ssize_t r = ::read(p[0], &buf, 1); // eof
102 TEST(File, Release) {
103 File in(STDOUT_FILENO, false);
104 CHECK_EQ(STDOUT_FILENO, in.release());
105 CHECK_EQ(-1, in.release());
108 #define EXPECT_CONTAINS(haystack, needle) \
109 EXPECT_NE(::std::string::npos, ::folly::StringPiece(haystack).find(needle)) \
110 << "Haystack: '" << haystack << "'\nNeedle: '" << needle << "'";
112 TEST(File, UsefulError) {
114 File("does_not_exist.txt", 0, 0666);
115 } catch (const std::runtime_error& e) {
116 EXPECT_CONTAINS(e.what(), "does_not_exist.txt");
117 EXPECT_CONTAINS(e.what(), "0666");
122 File temp = File::temporary();
124 EXPECT_TRUE(bool(temp));
132 if (File file = File::temporary()) {
138 EXPECT_FALSE(bool(File()));
142 if (File notOpened = File()) {
148 typedef std::unique_lock<File> Lock;
149 typedef boost::shared_lock<File> SharedLock;
151 // Find out where we are.
152 static constexpr size_t pathLength = 2048;
153 char buf[pathLength + 1];
154 int r = readlink("/proc/self/exe", buf, pathLength);
158 // NOTE(agallagher): Our various internal build systems layout built
159 // binaries differently, so the two layouts below.
161 auto helper_basename = "file_test_lock_helper";
163 if (fs::exists(me.parent_path() / helper_basename)) {
164 helper = me.parent_path() / helper_basename;
165 } else if (fs::exists(
166 me.parent_path().parent_path() / helper_basename / helper_basename)) {
167 helper = me.parent_path().parent_path()
168 / helper_basename / helper_basename;
170 throw std::runtime_error(
171 folly::to<std::string>("cannot find helper ", helper_basename));
174 TemporaryFile tempFile;
175 File f(tempFile.fd());
177 enum LockMode { EXCLUSIVE, SHARED };
178 auto testLock = [&] (LockMode mode, bool expectedSuccess) {
180 Subprocess({helper.native(),
181 mode == SHARED ? "-s" : "-x",
182 tempFile.path().native()}).wait();
183 EXPECT_TRUE(ret.exited());
185 EXPECT_EQ(expectedSuccess ? 0 : 42, ret.exitStatus());
189 // Make sure nothing breaks and things compile.
199 Lock lock(f, std::defer_lock);
200 EXPECT_TRUE(lock.try_lock());
204 SharedLock lock(f, boost::defer_lock);
205 EXPECT_TRUE(lock.try_lock());
211 testLock(EXCLUSIVE, false);
217 testLock(SHARED, false);
223 testLock(EXCLUSIVE, false);
226 // S does not block S
229 testLock(SHARED, true);