// Copyright (c) 2000 - 2007, 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.

//

// Portable implementation - just use glibc

//

// Note:  The glibc implementation may cause a call to malloc.

// This can cause a deadlock in HeapProfiler.

#include <execinfo.h>

#include <string.h>

#include "stacktrace.h"

_START_GOOGLE_NAMESPACE_

// If you change this function, also change GetStackFrames below.

int GetStackTrace(void** result, int max_depth, int skip_count) {

  static const int kStackLength = 64;

  void * stack[kStackLength];

  int size;

  size = backtrace(stack, kStackLength);

  skip_count++;  // we want to skip the current frame as well

  int result_count = size - skip_count;

  if (result_count < 0)

    result_count = 0;

  if (result_count > max_depth)

    result_count = max_depth;

  for (int i = 0; i < result_count; i++)

    result[i] = stack[i + skip_count];

  return result_count;

}

_END_GOOGLE_NAMESPACE_