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| 1 // Copyright (c) 2012 The Chromium 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. | |
| 4 | |
| 5 #include "base/linux_util.h" | |
| 6 | |
| 7 #include <dirent.h> | |
| 8 #include <errno.h> | |
| 9 #include <fcntl.h> | |
| 10 #include <stdlib.h> | |
| 11 #include <sys/stat.h> | |
| 12 #include <sys/types.h> | |
| 13 #include <unistd.h> | |
| 14 | |
| 15 #include <vector> | |
| 16 | |
| 17 #include "base/command_line.h" | |
| 18 #include "base/files/file_util.h" | |
| 19 #include "base/memory/scoped_ptr.h" | |
| 20 #include "base/memory/singleton.h" | |
| 21 #include "base/process/launch.h" | |
| 22 #include "base/strings/string_util.h" | |
| 23 #include "base/synchronization/lock.h" | |
| 24 | |
| 25 namespace { | |
| 26 | |
| 27 // Not needed for OS_CHROMEOS. | |
| 28 #if defined(OS_LINUX) | |
| 29 enum LinuxDistroState { | |
| 30 STATE_DID_NOT_CHECK = 0, | |
| 31 STATE_CHECK_STARTED = 1, | |
| 32 STATE_CHECK_FINISHED = 2, | |
| 33 }; | |
| 34 | |
| 35 // Helper class for GetLinuxDistro(). | |
| 36 class LinuxDistroHelper { | |
| 37 public: | |
| 38 // Retrieves the Singleton. | |
| 39 static LinuxDistroHelper* GetInstance() { | |
| 40 return Singleton<LinuxDistroHelper>::get(); | |
| 41 } | |
| 42 | |
| 43 // The simple state machine goes from: | |
| 44 // STATE_DID_NOT_CHECK -> STATE_CHECK_STARTED -> STATE_CHECK_FINISHED. | |
| 45 LinuxDistroHelper() : state_(STATE_DID_NOT_CHECK) {} | |
| 46 ~LinuxDistroHelper() {} | |
| 47 | |
| 48 // Retrieve the current state, if we're in STATE_DID_NOT_CHECK, | |
| 49 // we automatically move to STATE_CHECK_STARTED so nobody else will | |
| 50 // do the check. | |
| 51 LinuxDistroState State() { | |
| 52 base::AutoLock scoped_lock(lock_); | |
| 53 if (STATE_DID_NOT_CHECK == state_) { | |
| 54 state_ = STATE_CHECK_STARTED; | |
| 55 return STATE_DID_NOT_CHECK; | |
| 56 } | |
| 57 return state_; | |
| 58 } | |
| 59 | |
| 60 // Indicate the check finished, move to STATE_CHECK_FINISHED. | |
| 61 void CheckFinished() { | |
| 62 base::AutoLock scoped_lock(lock_); | |
| 63 DCHECK_EQ(STATE_CHECK_STARTED, state_); | |
| 64 state_ = STATE_CHECK_FINISHED; | |
| 65 } | |
| 66 | |
| 67 private: | |
| 68 base::Lock lock_; | |
| 69 LinuxDistroState state_; | |
| 70 }; | |
| 71 #endif // if defined(OS_LINUX) | |
| 72 | |
| 73 } // namespace | |
| 74 | |
| 75 namespace base { | |
| 76 | |
| 77 // Account for the terminating null character. | |
| 78 static const int kDistroSize = 128 + 1; | |
| 79 | |
| 80 // We use this static string to hold the Linux distro info. If we | |
| 81 // crash, the crash handler code will send this in the crash dump. | |
| 82 char g_linux_distro[kDistroSize] = | |
| 83 #if defined(OS_CHROMEOS) | |
| 84 "CrOS"; | |
| 85 #elif defined(OS_ANDROID) | |
| 86 "Android"; | |
| 87 #else // if defined(OS_LINUX) | |
| 88 "Unknown"; | |
| 89 #endif | |
| 90 | |
| 91 std::string GetLinuxDistro() { | |
| 92 #if defined(OS_CHROMEOS) || defined(OS_ANDROID) | |
| 93 return g_linux_distro; | |
| 94 #elif defined(OS_LINUX) | |
| 95 LinuxDistroHelper* distro_state_singleton = LinuxDistroHelper::GetInstance(); | |
| 96 LinuxDistroState state = distro_state_singleton->State(); | |
| 97 if (STATE_CHECK_FINISHED == state) | |
| 98 return g_linux_distro; | |
| 99 if (STATE_CHECK_STARTED == state) | |
| 100 return "Unknown"; // Don't wait for other thread to finish. | |
| 101 DCHECK_EQ(state, STATE_DID_NOT_CHECK); | |
| 102 // We do this check only once per process. If it fails, there's | |
| 103 // little reason to believe it will work if we attempt to run | |
| 104 // lsb_release again. | |
| 105 std::vector<std::string> argv; | |
| 106 argv.push_back("lsb_release"); | |
| 107 argv.push_back("-d"); | |
| 108 std::string output; | |
| 109 base::GetAppOutput(CommandLine(argv), &output); | |
| 110 if (output.length() > 0) { | |
| 111 // lsb_release -d should return: Description:<tab>Distro Info | |
| 112 const char field[] = "Description:\t"; | |
| 113 if (output.compare(0, strlen(field), field) == 0) { | |
| 114 SetLinuxDistro(output.substr(strlen(field))); | |
| 115 } | |
| 116 } | |
| 117 distro_state_singleton->CheckFinished(); | |
| 118 return g_linux_distro; | |
| 119 #else | |
| 120 NOTIMPLEMENTED(); | |
| 121 return "Unknown"; | |
| 122 #endif | |
| 123 } | |
| 124 | |
| 125 void SetLinuxDistro(const std::string& distro) { | |
| 126 std::string trimmed_distro; | |
| 127 base::TrimWhitespaceASCII(distro, base::TRIM_ALL, &trimmed_distro); | |
| 128 base::strlcpy(g_linux_distro, trimmed_distro.c_str(), kDistroSize); | |
| 129 } | |
| 130 | |
| 131 pid_t FindThreadIDWithSyscall(pid_t pid, const std::string& expected_data, | |
| 132 bool* syscall_supported) { | |
| 133 char buf[256]; | |
| 134 snprintf(buf, sizeof(buf), "/proc/%d/task", pid); | |
| 135 | |
| 136 if (syscall_supported != NULL) | |
| 137 *syscall_supported = false; | |
| 138 | |
| 139 DIR* task = opendir(buf); | |
| 140 if (!task) { | |
| 141 DLOG(WARNING) << "Cannot open " << buf; | |
| 142 return -1; | |
| 143 } | |
| 144 | |
| 145 std::vector<pid_t> tids; | |
| 146 struct dirent* dent; | |
| 147 while ((dent = readdir(task))) { | |
| 148 char* endptr; | |
| 149 const unsigned long int tid_ul = strtoul(dent->d_name, &endptr, 10); | |
| 150 if (tid_ul == ULONG_MAX || *endptr) | |
| 151 continue; | |
| 152 tids.push_back(tid_ul); | |
| 153 } | |
| 154 closedir(task); | |
| 155 | |
| 156 scoped_ptr<char[]> syscall_data(new char[expected_data.length()]); | |
| 157 for (std::vector<pid_t>::const_iterator | |
| 158 i = tids.begin(); i != tids.end(); ++i) { | |
| 159 const pid_t current_tid = *i; | |
| 160 snprintf(buf, sizeof(buf), "/proc/%d/task/%d/syscall", pid, current_tid); | |
| 161 int fd = open(buf, O_RDONLY); | |
| 162 if (fd < 0) | |
| 163 continue; | |
| 164 if (syscall_supported != NULL) | |
| 165 *syscall_supported = true; | |
| 166 bool read_ret = ReadFromFD(fd, syscall_data.get(), expected_data.length()); | |
| 167 close(fd); | |
| 168 if (!read_ret) | |
| 169 continue; | |
| 170 | |
| 171 if (0 == strncmp(expected_data.c_str(), syscall_data.get(), | |
| 172 expected_data.length())) { | |
| 173 return current_tid; | |
| 174 } | |
| 175 } | |
| 176 return -1; | |
| 177 } | |
| 178 | |
| 179 } // namespace base | |
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