1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17 #include "src/ftrace_reader/atrace_wrapper.h" 18 19 #include <fcntl.h> 20 #include <stdint.h> 21 #include <string.h> 22 #include <sys/stat.h> 23 #include <sys/types.h> 24 #include <sys/wait.h> 25 #include <unistd.h> 26 27 #include "perfetto/base/logging.h" 28 29 namespace perfetto { 30 31 namespace { 32 33 RunAtraceFunction g_run_atrace_for_testing = nullptr; 34 35 #if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) 36 // Args should include "atrace" for argv[0]. 37 bool ExecvAtrace(const std::vector<std::string>& args) { 38 int status = 1; 39 40 std::vector<char*> argv; 41 // args, and then a null. 42 argv.reserve(1 + args.size()); 43 for (const auto& arg : args) 44 argv.push_back(const_cast<char*>(arg.c_str())); 45 argv.push_back(nullptr); 46 47 pid_t pid = fork(); 48 PERFETTO_CHECK(pid >= 0); 49 if (pid == 0) { 50 // Close stdin/out/err + any file descriptor that we might have mistakenly 51 // not marked as FD_CLOEXEC. 52 for (int i = 0; i < 128; i++) 53 close(i); 54 execv("/system/bin/atrace", &argv[0]); 55 // Reached only if execv fails. 56 _exit(1); 57 } 58 PERFETTO_EINTR(waitpid(pid, &status, 0)); 59 return status == 0; 60 } 61 #endif 62 63 } // namespace 64 65 bool RunAtrace(const std::vector<std::string>& args) { 66 if (g_run_atrace_for_testing) 67 return g_run_atrace_for_testing(args); 68 #if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) 69 return ExecvAtrace(args); 70 #else 71 PERFETTO_LOG("Atrace only supported on Android."); 72 return false; 73 #endif 74 } 75 76 void SetRunAtraceForTesting(RunAtraceFunction f) { 77 g_run_atrace_for_testing = f; 78 } 79 80 } // namespace perfetto 81
