1 files changed, 0 insertions, 155 deletions
diff --git a/libmemunreachable/PtracerThread.cpp b/libmemunreachable/PtracerThread.cpp
deleted file mode 100644
index d2fca49f2..000000000
--- a/libmemunreachable/PtracerThread.cpp
+++ /dev/null
@@ -1,155 +0,0 @@
-/*
- * Copyright (C) 2016 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.
- */
-
-#include <errno.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <pthread.h>
-#include <sched.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/prctl.h>
-#include <sys/syscall.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <unistd.h>
-
-#include "android-base/macros.h"
-
-#include "PtracerThread.h"
-#include "log.h"
-
-namespace android {
-
-class Stack {
- public:
-  explicit Stack(size_t size) : size_(size) {
-    int prot = PROT_READ | PROT_WRITE;
-    int flags = MAP_PRIVATE | MAP_ANONYMOUS;
-    page_size_ = sysconf(_SC_PAGE_SIZE);
-    size_ += page_size_ * 2;  // guard pages
-    base_ = mmap(NULL, size_, prot, flags, -1, 0);
-    if (base_ == MAP_FAILED) {
-      base_ = NULL;
-      size_ = 0;
-      return;
-    }
-    prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, base_, size_, "libmemunreachable stack");
-    mprotect(base_, page_size_, PROT_NONE);
-    mprotect(top(), page_size_, PROT_NONE);
-  };
-  ~Stack() { munmap(base_, size_); };
-  void* top() {
-    return reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(base_) + size_ - page_size_);
-  };
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(Stack);
-
-  void* base_;
-  size_t size_;
-  size_t page_size_;
-};
-
-PtracerThread::PtracerThread(const std::function<int()>& func) : child_pid_(0) {
-  stack_ = std::make_unique<Stack>(PTHREAD_STACK_MIN);
-  if (stack_->top() == nullptr) {
-    MEM_LOG_ALWAYS_FATAL("failed to mmap child stack: %s", strerror(errno));
-  }
-
-  func_ = std::function<int()>{[&, func]() -> int {
-    // In the child thread, lock and unlock the mutex to wait for the parent
-    // to finish setting up for the child thread
-    std::unique_lock<std::mutex> lk(m_);
-    lk.unlock();
-    _exit(func());
-  }};
-}
-
-PtracerThread::~PtracerThread() {
-  Kill();
-  Join();
-  ClearTracer();
-  stack_ = nullptr;
-}
-
-bool PtracerThread::Start() {
-  std::unique_lock<std::mutex> lk(m_);
-
-  // Convert from void(*)(void*) to lambda with captures
-  auto proxy = [](void* arg) -> int {
-    prctl(PR_SET_NAME, "libmemunreachable ptrace thread");
-    return (*reinterpret_cast<std::function<int()>*>(arg))();
-  };
-
-  // See README.md for why we create the child process this way
-  child_pid_ = clone(proxy, stack_->top(), CLONE_VM | CLONE_FS | CLONE_FILES /*|CLONE_UNTRACED*/,
-                     reinterpret_cast<void*>(&func_));
-  if (child_pid_ < 0) {
-    MEM_ALOGE("failed to clone child: %s", strerror(errno));
-    return false;
-  }
-
-  SetTracer(child_pid_);
-
-  lk.unlock();
-
-  return true;
-}
-
-int PtracerThread::Join() {
-  if (child_pid_ == -1) {
-    return -1;
-  }
-  int status;
-  int ret = TEMP_FAILURE_RETRY(waitpid(child_pid_, &status, __WALL));
-  if (ret < 0) {
-    MEM_ALOGE("waitpid %d failed: %s", child_pid_, strerror(errno));
-    return -1;
-  }
-
-  child_pid_ = -1;
-
-  if (WIFEXITED(status)) {
-    return WEXITSTATUS(status);
-  } else if (WIFSIGNALED(status)) {
-    return -WTERMSIG(status);
-  } else {
-    MEM_ALOGE("unexpected status %x", status);
-    return -1;
-  }
-}
-
-void PtracerThread::Kill() {
-  if (child_pid_ == -1) {
-    return;
-  }
-
-  syscall(SYS_tkill, child_pid_, SIGKILL);
-}
-
-void PtracerThread::SetTracer(pid_t tracer_pid) {
-  prctl(PR_SET_PTRACER, tracer_pid);
-}
-
-void PtracerThread::ClearTracer() {
-  prctl(PR_SET_PTRACER, 0);
-}
-
-}  // namespace android