text: // Copyright 2020 The Crashpad Authors. All rights reserved.
  //
  // 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 <dlfcn.h>
  #include <pthread.h>
  
  #include "base/logging.h"
  #include "client/crashpad_client.h"
  #include "util/misc/no_cfi_icall.h"
  
  namespace {
  
  using StartRoutineType = void* (*)(void*);
  
  struct StartParams {
    StartRoutineType start_routine;
    void* arg;
  };
  
  void* InitializeSignalStackAndStart(StartParams* params) {
    crashpad::CrashpadClient::InitializeSignalStackForThread();
  
    crashpad::NoCfiIcall<StartRoutineType> start_routine(params->start_routine);
    void* arg = params->arg;
    delete params;
  
    return start_routine(arg);
  }
  
  }  // namespace
  
  extern "C" {
  
  __attribute__((visibility("default"))) int pthread_create(
      pthread_t* thread,
      const pthread_attr_t* attr,
      StartRoutineType start_routine,
      void* arg) {
    static const crashpad::NoCfiIcall<decltype(pthread_create)*>
        next_pthread_create([]() {
          const auto next_pthread_create = dlsym(RTLD_NEXT, "pthread_create");
          CHECK(next_pthread_create) << "dlsym: " << dlerror();
          return next_pthread_create;
        }());
  
    StartParams* params = new StartParams;
    params->start_routine = start_routine;
    params->arg = arg;
  
    int result = next_pthread_create(
        thread,
        attr,
        reinterpret_cast<StartRoutineType>(InitializeSignalStackAndStart),
        params);
    if (result != 0) {
      delete params;
    }
    return result;
  }
  
  }  // extern "C"
  