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// Copyright (c) 2011, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// crash_generator.h: Define the google_breakpad::CrashGenerator class,
// which is used to generate a crash (and a core dump file) for testing.
#ifndef COMMON_LINUX_TESTS_CRASH_GENERATOR_H_
#define COMMON_LINUX_TESTS_CRASH_GENERATOR_H_
#include <sys/resource.h>
#include <string>
#include "common/tests/auto_tempdir.h"
namespace google_breakpad {
// A utility class for generating a crash (and a core dump file) for
// testing. It creates a child process with the specified number of
// threads, which is then termainated by the specified signal. A core
// dump file is expected to be created upon the termination of the child
// process, which can then be used for testing code that processes core
// dump files.
class CrashGenerator {
public:
CrashGenerator();
~CrashGenerator();
// Returns true if a core dump file named 'core' will be generated in
// the current directory for a test that produces a crash by checking
// if /proc/sys/kernel/core_pattern has the default value 'core'.
bool HasDefaultCorePattern() const;
// Returns the expected path of the core dump file.
std::string GetCoreFilePath() const;
// Returns the directory of a copy of proc files of the child process.
std::string GetDirectoryOfProcFilesCopy() const;
// Creates a crash (and a core dump file) by creating a child process with
// |num_threads| threads, and the terminating the child process by sending
// a signal with number |crash_signal| to the |crash_thread|-th thread.
// Returns true on success.
bool CreateChildCrash(unsigned num_threads, unsigned crash_thread,
int crash_signal, pid_t* child_pid);
// Returns the thread ID of the |index|-th thread in the child process.
// This method does not validate |index|.
pid_t GetThreadId(unsigned index) const;
private:
// Copies the following proc files of the process with |pid| to the directory
// at |path|: auxv, cmdline, environ, maps, status
// The directory must have been created. Returns true on success.
bool CopyProcFiles(pid_t pid, const char* path) const;
// Creates |num_threads| threads in the child process.
void CreateThreadsInChildProcess(unsigned num_threads);
// Sets the maximum size of core dump file (both the soft and hard limit)
// to |limit| bytes. Returns true on success.
bool SetCoreFileSizeLimit(rlim_t limit) const;
// Creates a shared memory of |memory_size| bytes for communicating thread
// IDs between the parent and child process. Returns true on success.
bool MapSharedMemory(size_t memory_size);
// Releases any shared memory created by MapSharedMemory(). Returns true on
// success.
bool UnmapSharedMemory();
// Returns the pointer to the thread ID of the |index|-th thread in the child
// process. This method does not validate |index|.
pid_t* GetThreadIdPointer(unsigned index);
// Temporary directory in which a core file is generated.
AutoTempDir temp_dir_;
// Shared memory for communicating thread IDs between the parent and
// child process.
void* shared_memory_;
// Number of bytes mapped for |shared_memory_|.
size_t shared_memory_size_;
};
} // namespace google_breakpad
#endif // COMMON_LINUX_TESTS_CRASH_GENERATOR_H_
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