1/*
2 *  Copyright 2009 The WebRTC Project Authors. All rights reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include <set>
12#include <sstream>
13
14#include "webrtc/base/gunit.h"
15#include "webrtc/base/linuxfdwalk.h"
16
17#include <sys/types.h>
18#include <sys/stat.h>
19#include <fcntl.h>
20#include <unistd.h>
21
22static const int kArbitraryLargeFdNumber = 424;
23
24static void FdCheckVisitor(void *data, int fd) {
25  std::set<int> *fds = static_cast<std::set<int> *>(data);
26  EXPECT_EQ(1U, fds->erase(fd));
27}
28
29static void FdEnumVisitor(void *data, int fd) {
30  std::set<int> *fds = static_cast<std::set<int> *>(data);
31  EXPECT_TRUE(fds->insert(fd).second);
32}
33
34// Checks that the set of open fds is exactly the given list.
35static void CheckOpenFdList(std::set<int> fds) {
36  EXPECT_EQ(0, fdwalk(&FdCheckVisitor, &fds));
37  EXPECT_EQ(0U, fds.size());
38}
39
40static void GetOpenFdList(std::set<int> *fds) {
41  fds->clear();
42  EXPECT_EQ(0, fdwalk(&FdEnumVisitor, fds));
43}
44
45TEST(LinuxFdWalk, TestFdWalk) {
46  std::set<int> fds;
47  GetOpenFdList(&fds);
48  std::ostringstream str;
49  // I have observed that the open set when starting a test is [0, 6]. Leaked
50  // fds would change that, but so can (e.g.) running under a debugger, so we
51  // can't really do an EXPECT. :(
52  str << "File descriptors open in test executable:";
53  for (std::set<int>::const_iterator i = fds.begin(); i != fds.end(); ++i) {
54    str << " " << *i;
55  }
56  LOG(LS_INFO) << str.str();
57  // Open some files.
58  int fd1 = open("/dev/null", O_RDONLY);
59  EXPECT_LE(0, fd1);
60  int fd2 = open("/dev/null", O_WRONLY);
61  EXPECT_LE(0, fd2);
62  int fd3 = open("/dev/null", O_RDWR);
63  EXPECT_LE(0, fd3);
64  int fd4 = dup2(fd3, kArbitraryLargeFdNumber);
65  EXPECT_LE(0, fd4);
66  EXPECT_TRUE(fds.insert(fd1).second);
67  EXPECT_TRUE(fds.insert(fd2).second);
68  EXPECT_TRUE(fds.insert(fd3).second);
69  EXPECT_TRUE(fds.insert(fd4).second);
70  CheckOpenFdList(fds);
71  EXPECT_EQ(0, close(fd1));
72  EXPECT_EQ(0, close(fd2));
73  EXPECT_EQ(0, close(fd3));
74  EXPECT_EQ(0, close(fd4));
75}
76