186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// Copyright (c) 2011, Google Inc. 286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// All rights reserved. 386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// 486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// Redistribution and use in source and binary forms, with or without 586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// modification, are permitted provided that the following conditions are 686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// met: 786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// 886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// * Redistributions of source code must retain the above copyright 986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// notice, this list of conditions and the following disclaimer. 1086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// * Redistributions in binary form must reproduce the above 1186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// copyright notice, this list of conditions and the following disclaimer 1286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// in the documentation and/or other materials provided with the 1386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// distribution. 1486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// * Neither the name of Google Inc. nor the names of its 1586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// contributors may be used to endorse or promote products derived from 1686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// this software without specific prior written permission. 1786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// 1886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 2086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 2186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 3086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// crash_generator.cc: Implement google_breakpad::CrashGenerator. 3186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// See crash_generator.h for details. 3286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 3386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include "common/linux/tests/crash_generator.h" 3486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 3586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include <pthread.h> 3686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include <signal.h> 37d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org#include <stdio.h> 3886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include <sys/mman.h> 3986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include <sys/resource.h> 4086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include <sys/syscall.h> 4186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include <sys/wait.h> 4286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include <unistd.h> 4386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 4486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include <string> 4586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 464ac3c240983991b6358baad732e2fbe3fd4f7245digit@chromium.org#if defined(__ANDROID__) 474ac3c240983991b6358baad732e2fbe3fd4f7245digit@chromium.org#include "common/android/testing/pthread_fixes.h" 484ac3c240983991b6358baad732e2fbe3fd4f7245digit@chromium.org#endif 4986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include "common/linux/eintr_wrapper.h" 5086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include "common/tests/auto_tempdir.h" 5186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org#include "common/tests/file_utils.h" 524e518a4357a2d1c379d4a91df6d4e153ee791101ivan.penkov@gmail.com#include "common/using_std_string.h" 5386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 5486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgnamespace { 5586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 5686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgstruct ThreadData { 5786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pthread_t thread; 5886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pthread_barrier_t* barrier; 5986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pid_t* thread_id_ptr; 6086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org}; 6186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 6213de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.orgconst char* const kProcFilesToCopy[] = { 6313de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org "auxv", "cmdline", "environ", "maps", "status" 6413de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org}; 6513de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.orgconst size_t kNumProcFilesToCopy = 6613de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org sizeof(kProcFilesToCopy) / sizeof(kProcFilesToCopy[0]); 6713de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org 68548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.orgint gettid() { 69548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org // Glibc does not provide a wrapper for this. 70548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org return syscall(__NR_gettid); 71548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org} 72548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org 73548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.orgint tkill(pid_t tid, int sig) { 74548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org // Glibc does not provide a wrapper for this. 75548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org return syscall(__NR_tkill, tid, sig); 76548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org} 77548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org 7886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org// Core file size limit set to 1 MB, which is big enough for test purposes. 7986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgconst rlim_t kCoreSizeLimit = 1024 * 1024; 8086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 8186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgvoid *thread_function(void *data) { 8286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org ThreadData* thread_data = reinterpret_cast<ThreadData*>(data); 83548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org volatile pid_t thread_id = gettid(); 8486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org *(thread_data->thread_id_ptr) = thread_id; 8586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org int result = pthread_barrier_wait(thread_data->barrier); 8686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (result != 0 && result != PTHREAD_BARRIER_SERIAL_THREAD) { 87548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org perror("Failed to wait for sync barrier"); 8886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org exit(1); 8986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 9086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org while (true) { 9186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pthread_yield(); 9286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 9386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 9486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 9586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} // namespace 9686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 9786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgnamespace google_breakpad { 9886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 9986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgCrashGenerator::CrashGenerator() 10086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org : shared_memory_(NULL), 10186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org shared_memory_size_(0) { 10286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 10386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 10486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgCrashGenerator::~CrashGenerator() { 10586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org UnmapSharedMemory(); 10686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 10786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 10886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgbool CrashGenerator::HasDefaultCorePattern() const { 10986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org char buffer[8]; 11086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org ssize_t buffer_size = sizeof(buffer); 11186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return ReadFile("/proc/sys/kernel/core_pattern", buffer, &buffer_size) && 11286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org buffer_size == 5 && memcmp(buffer, "core", 4) == 0; 11386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 11486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 1154e518a4357a2d1c379d4a91df6d4e153ee791101ivan.penkov@gmail.comstring CrashGenerator::GetCoreFilePath() const { 11686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return temp_dir_.path() + "/core"; 11786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 11886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 1194e518a4357a2d1c379d4a91df6d4e153ee791101ivan.penkov@gmail.comstring CrashGenerator::GetDirectoryOfProcFilesCopy() const { 12013de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org return temp_dir_.path() + "/proc"; 12113de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org} 12213de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org 12386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgpid_t CrashGenerator::GetThreadId(unsigned index) const { 12486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return reinterpret_cast<pid_t*>(shared_memory_)[index]; 12586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 12686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 12786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgpid_t* CrashGenerator::GetThreadIdPointer(unsigned index) { 12886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return reinterpret_cast<pid_t*>(shared_memory_) + index; 12986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 13086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 13186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgbool CrashGenerator::MapSharedMemory(size_t memory_size) { 13286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (!UnmapSharedMemory()) 13386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return false; 13486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 13586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org void* mapped_memory = mmap(0, memory_size, PROT_READ | PROT_WRITE, 13686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org MAP_SHARED | MAP_ANONYMOUS, -1, 0); 137d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org if (mapped_memory == MAP_FAILED) { 138d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org perror("CrashGenerator: Failed to map shared memory"); 13986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return false; 140d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org } 14186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 14286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org memset(mapped_memory, 0, memory_size); 14386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org shared_memory_ = mapped_memory; 14486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org shared_memory_size_ = memory_size; 14586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return true; 14686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 14786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 14886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgbool CrashGenerator::UnmapSharedMemory() { 14986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (!shared_memory_) 15086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return true; 15186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 15286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (munmap(shared_memory_, shared_memory_size_) == 0) { 15386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org shared_memory_ = NULL; 15486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org shared_memory_size_ = 0; 15586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return true; 15686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 157d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org 158d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org perror("CrashGenerator: Failed to unmap shared memory"); 15986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return false; 16086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 16186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 16286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgbool CrashGenerator::SetCoreFileSizeLimit(rlim_t limit) const { 16386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org struct rlimit limits = { limit, limit }; 164d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org if (setrlimit(RLIMIT_CORE, &limits) == -1) { 165d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org perror("CrashGenerator: Failed to set core file size limit"); 166d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org return false; 167d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org } 168d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org return true; 16986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 17086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 17186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgbool CrashGenerator::CreateChildCrash( 1724fa638a7ecb6ab042664300767614308dbc147bbbenchan@chromium.org unsigned num_threads, unsigned crash_thread, int crash_signal, 1734fa638a7ecb6ab042664300767614308dbc147bbbenchan@chromium.org pid_t* child_pid) { 174548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org if (num_threads == 0 || crash_thread >= num_threads) { 175548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org fprintf(stderr, "CrashGenerator: Invalid thread counts; num_threads=%u" 176548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org " crash_thread=%u\n", num_threads, crash_thread); 17786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return false; 178548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org } 17986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 180548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org if (!MapSharedMemory(num_threads * sizeof(pid_t))) { 181548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org perror("CrashGenerator: Unable to map shared memory"); 18286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return false; 183548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org } 18486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 18586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pid_t pid = fork(); 18686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (pid == 0) { 187d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org if (chdir(temp_dir_.path().c_str()) == -1) { 188d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org perror("CrashGenerator: Failed to change directory"); 189d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org exit(1); 190d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org } 191d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org if (SetCoreFileSizeLimit(kCoreSizeLimit)) { 19286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org CreateThreadsInChildProcess(num_threads); 1934e518a4357a2d1c379d4a91df6d4e153ee791101ivan.penkov@gmail.com string proc_dir = GetDirectoryOfProcFilesCopy(); 19413de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org if (mkdir(proc_dir.c_str(), 0755) == -1) { 19513de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org perror("CrashGenerator: Failed to create proc directory"); 19613de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org exit(1); 19713de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org } 19813de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org if (!CopyProcFiles(getpid(), proc_dir.c_str())) { 19913de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org fprintf(stderr, "CrashGenerator: Failed to copy proc files\n"); 20013de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org exit(1); 20113de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org } 20220e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // On Android the signal sometimes doesn't seem to get sent even though 20320e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // tkill returns '0'. Retry a couple of times if the signal doesn't get 20420e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // through on the first go: 20520e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // https://code.google.com/p/google-breakpad/issues/detail?id=579 206a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org#if defined(__ANDROID__) 207a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org const int kRetries = 60; 208a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org const unsigned int kSleepTimeInSeconds = 1; 209a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org#else 210a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org const int kRetries = 1; 211a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org const unsigned int kSleepTimeInSeconds = 600; 212a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org#endif 213a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org for (int i = 0; i < kRetries; i++) { 21420e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org if (tkill(*GetThreadIdPointer(crash_thread), crash_signal) == -1) { 21520e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org perror("CrashGenerator: Failed to kill thread by signal"); 21620e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org } else { 21720e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // At this point, we've queued the signal for delivery, but there's no 21820e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // guarantee when it'll be delivered. We don't want the main thread to 21920e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // race and exit before the thread we signaled is processed. So sleep 22020e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // long enough that we won't flake even under fairly high load. 22120e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // TODO: See if we can't be a bit more deterministic. There doesn't 22220e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // seem to be an API to check on signal delivery status, so we can't 22320e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // really poll and wait for the kernel to declare the signal has been 22420e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // delivered. If it has, and things worked, we'd be killed, so the 22520e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org // sleep length doesn't really matter. 226a05b5ce79b11e816173d1c953feb9f0276b4632cthestig@chromium.org sleep(kSleepTimeInSeconds); 22720e305dc1813dac20acac5f9c0c593d023d8583crmcilroy@chromium.org } 228d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org } 229548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org } else { 230548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org perror("CrashGenerator: Failed to set core limit"); 23186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 23286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org exit(1); 233d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org } else if (pid == -1) { 234d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org perror("CrashGenerator: Failed to create child process"); 235d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org return false; 23686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 23786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 23886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org int status; 239d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org if (HANDLE_EINTR(waitpid(pid, &status, 0)) == -1) { 240d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org perror("CrashGenerator: Failed to wait for child process"); 24186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return false; 242d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org } 243d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org if (!WIFSIGNALED(status) || WTERMSIG(status) != crash_signal) { 244e6b51ac7a6c1e84d34d03b60001012947fb8d995ted.mielczarek fprintf(stderr, "CrashGenerator: Child process not killed by the expected signal\n" 245548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org " exit status=0x%x pid=%u signaled=%s sig=%d expected=%d\n", 246548501df371a517683d8b4d05c05b3929ad43141vapier@chromium.org status, pid, WIFSIGNALED(status) ? "true" : "false", 247e6b51ac7a6c1e84d34d03b60001012947fb8d995ted.mielczarek WTERMSIG(status), crash_signal); 248d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org return false; 249d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org } 2504fa638a7ecb6ab042664300767614308dbc147bbbenchan@chromium.org 2514fa638a7ecb6ab042664300767614308dbc147bbbenchan@chromium.org if (child_pid) 2524fa638a7ecb6ab042664300767614308dbc147bbbenchan@chromium.org *child_pid = pid; 25386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return true; 25486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 25586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 25613de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.orgbool CrashGenerator::CopyProcFiles(pid_t pid, const char* path) const { 25713de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org char from_path[PATH_MAX], to_path[PATH_MAX]; 25813de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org for (size_t i = 0; i < kNumProcFilesToCopy; ++i) { 25913de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org int num_chars = snprintf(from_path, PATH_MAX, "/proc/%d/%s", 26013de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org pid, kProcFilesToCopy[i]); 26113de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org if (num_chars < 0 || num_chars >= PATH_MAX) 26213de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org return false; 26313de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org 26413de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org num_chars = snprintf(to_path, PATH_MAX, "%s/%s", 26513de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org path, kProcFilesToCopy[i]); 26613de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org if (num_chars < 0 || num_chars >= PATH_MAX) 26713de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org return false; 26813de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org 26913de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org if (!CopyFile(from_path, to_path)) 27013de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org return false; 27113de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org } 27213de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org return true; 27313de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org} 27413de24a86ecf4d87d9c151e496282123c4654958benchan@chromium.org 27586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.orgvoid CrashGenerator::CreateThreadsInChildProcess(unsigned num_threads) { 27686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org *GetThreadIdPointer(0) = getpid(); 27786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 27886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (num_threads <= 1) 27986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org return; 28086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 28186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org // This method does not clean up any pthread resource, as the process 28286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org // is expected to be killed anyway. 28386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org ThreadData* thread_data = new ThreadData[num_threads]; 28486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 28586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org // Create detached threads so that we do not worry about pthread_join() 28686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org // later being called or not. 28786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pthread_attr_t thread_attributes; 28886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (pthread_attr_init(&thread_attributes) != 0 || 28986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pthread_attr_setdetachstate(&thread_attributes, 29086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org PTHREAD_CREATE_DETACHED) != 0) { 291d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org fprintf(stderr, "CrashGenerator: Failed to initialize thread attribute\n"); 29286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org exit(1); 29386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 29486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 29586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pthread_barrier_t thread_barrier; 29686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (pthread_barrier_init(&thread_barrier, NULL, num_threads) != 0) { 297d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org fprintf(stderr, "CrashGenerator: Failed to initialize thread barrier\n"); 29886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org exit(1); 29986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 30086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 30186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org for (unsigned i = 1; i < num_threads; ++i) { 30286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org thread_data[i].barrier = &thread_barrier; 30386cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org thread_data[i].thread_id_ptr = GetThreadIdPointer(i); 30486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (pthread_create(&thread_data[i].thread, &thread_attributes, 30586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org thread_function, &thread_data[i]) != 0) { 306d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org fprintf(stderr, "CrashGenerator: Failed to create thread %d\n", i); 30786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org exit(1); 30886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 30986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 31086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 31186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org int result = pthread_barrier_wait(&thread_barrier); 31286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org if (result != 0 && result != PTHREAD_BARRIER_SERIAL_THREAD) { 313d0765367cb68452e580bcb3531b38db822ea17f3benchan@chromium.org fprintf(stderr, "CrashGenerator: Failed to wait for thread barrier\n"); 31486cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org exit(1); 31586cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org } 31686cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 31786cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pthread_barrier_destroy(&thread_barrier); 31886cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org pthread_attr_destroy(&thread_attributes); 31986cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org delete[] thread_data; 32086cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} 32186cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org 32286cbb1e5cc967853dfc2b10f8fc8da43fc734c77benchan@chromium.org} // namespace google_breakpad 323