1 /* 2 * libjingle 3 * Copyright 2009, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <set> 29 #include <sstream> 30 31 #include "talk/base/gunit.h" 32 #include "talk/base/linuxfdwalk.h" 33 34 #include <sys/types.h> 35 #include <sys/stat.h> 36 #include <fcntl.h> 37 #include <unistd.h> 38 39 static const int kArbitraryLargeFdNumber = 424; 40 41 static void FdCheckVisitor(void *data, int fd) { 42 std::set<int> *fds = static_cast<std::set<int> *>(data); 43 EXPECT_EQ(1U, fds->erase(fd)); 44 } 45 46 static void FdEnumVisitor(void *data, int fd) { 47 std::set<int> *fds = static_cast<std::set<int> *>(data); 48 EXPECT_TRUE(fds->insert(fd).second); 49 } 50 51 // Checks that the set of open fds is exactly the given list. 52 static void CheckOpenFdList(std::set<int> fds) { 53 EXPECT_EQ(0, fdwalk(&FdCheckVisitor, &fds)); 54 EXPECT_EQ(0U, fds.size()); 55 } 56 57 static void GetOpenFdList(std::set<int> *fds) { 58 fds->clear(); 59 EXPECT_EQ(0, fdwalk(&FdEnumVisitor, fds)); 60 } 61 62 TEST(LinuxFdWalk, TestFdWalk) { 63 std::set<int> fds; 64 GetOpenFdList(&fds); 65 std::ostringstream str; 66 // I have observed that the open set when starting a test is [0, 6]. Leaked 67 // fds would change that, but so can (e.g.) running under a debugger, so we 68 // can't really do an EXPECT. :( 69 str << "File descriptors open in test executable:"; 70 for (std::set<int>::const_iterator i = fds.begin(); i != fds.end(); ++i) { 71 str << " " << *i; 72 } 73 LOG(LS_INFO) << str.str(); 74 // Open some files. 75 int fd1 = open("/dev/null", O_RDONLY); 76 EXPECT_LE(0, fd1); 77 int fd2 = open("/dev/null", O_WRONLY); 78 EXPECT_LE(0, fd2); 79 int fd3 = open("/dev/null", O_RDWR); 80 EXPECT_LE(0, fd3); 81 int fd4 = dup2(fd3, kArbitraryLargeFdNumber); 82 EXPECT_LE(0, fd4); 83 EXPECT_TRUE(fds.insert(fd1).second); 84 EXPECT_TRUE(fds.insert(fd2).second); 85 EXPECT_TRUE(fds.insert(fd3).second); 86 EXPECT_TRUE(fds.insert(fd4).second); 87 CheckOpenFdList(fds); 88 EXPECT_EQ(0, close(fd1)); 89 EXPECT_EQ(0, close(fd2)); 90 EXPECT_EQ(0, close(fd3)); 91 EXPECT_EQ(0, close(fd4)); 92 } 93
