Hector Dearman | c20f221 | 2018-03-08 10:39:00 +0000 | [diff] [blame] | 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 | |
Primiano Tucci | 3cbb10a | 2018-04-10 17:52:40 +0100 | [diff] [blame] | 17 | #include "src/ftrace_reader/atrace_wrapper.h" |
Hector Dearman | c20f221 | 2018-03-08 10:39:00 +0000 | [diff] [blame] | 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 |