| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "crash_dispatcher" |
| |
| #include <vector> |
| |
| #include <elf.h> |
| #include <errno.h> |
| #include <unistd.h> |
| |
| #include <android-base/file.h> |
| #include <log/log.h> |
| |
| namespace { |
| |
| const char kCrashCollector32Path[] = "/system/bin/crash_collector32"; |
| const char kCrashCollector64Path[] = "/system/bin/crash_collector64"; |
| |
| } // namespace |
| |
| // Reads the coredump from STDIN and checks whether it's 32-bit or 64-bit, |
| // and dispatches it to the appropriate version of crash_collector. |
| int main(int argc, char** argv) { |
| // Do not abort on a write error caused by a broken pipe. |
| signal(SIGPIPE, SIG_IGN); |
| // Read the ELF header until EI_CLASS. |
| char buf_head[EI_CLASS + 1]; |
| if (!android::base::ReadFully(STDIN_FILENO, buf_head, sizeof(buf_head))) { |
| ALOGE("Failed to read. errno = %d", errno); |
| return 1; |
| } |
| // Set up pipe to feed coredump to crash_collector. |
| int pipe_fds[2]; |
| if (pipe(pipe_fds) == -1) { |
| ALOGE("Failed to pipe. errno = %d", errno); |
| return 1; |
| } |
| // Prepare crash_collector arguments. |
| const char* crash_collector_path = buf_head[EI_CLASS] == ELFCLASS64 ? |
| kCrashCollector64Path : kCrashCollector32Path; |
| std::vector<const char*> args(argc + 1); |
| args[0] = crash_collector_path; |
| std::copy(argv + 1, argv + argc, args.begin() + 1); |
| args.back() = nullptr; |
| // Exec crash_collector. |
| const pid_t pid = fork(); |
| if (pid == -1) { |
| ALOGE("Failed to fork. errno = %d", errno); |
| return 1; |
| } |
| if (pid == 0) { |
| if (close(pipe_fds[1]) != 0 && errno != EINTR) { |
| ALOGE("Failed to close the pipe's write end. errno = %d", errno); |
| _exit(1); |
| } |
| if (TEMP_FAILURE_RETRY(dup2(pipe_fds[0], STDIN_FILENO)) != 0) { |
| ALOGE("Failed to dup the pipe's read end. errno = %d", errno); |
| _exit(1); |
| } |
| execve(args[0], const_cast<char**>(&args[0]), environ); |
| ALOGE("Failed to execute crash_collector. errno = %d", errno); |
| _exit(1); |
| } |
| // Send buf_head to crash_collector. |
| if (close(pipe_fds[0]) != 0 && errno != EINTR) { |
| ALOGE("Failed to close the pipe's read end."); |
| return 1; |
| } |
| if (!android::base::WriteFully(pipe_fds[1], buf_head, sizeof(buf_head))) { |
| return 1; |
| } |
| // Send the rest of coredump to crash_collector. |
| const size_t kBufSize = 32768; |
| char buf[kBufSize]; |
| while (true) { |
| int rv = TEMP_FAILURE_RETRY(read(STDIN_FILENO, buf, kBufSize)); |
| if (rv == -1) { |
| ALOGE("Failed to read. errno = %d", errno); |
| return 1; |
| } |
| if (rv == 0) |
| break; |
| if (!android::base::WriteFully(pipe_fds[1], buf, rv)) { |
| return 1; |
| } |
| } |
| return 0; |
| } |