// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/process_util.h"

#include <dirent.h>
#include <malloc.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#include "base/file_util.h"
#include "base/logging.h"
#include "base/process/internal_linux.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/sys_info.h"
#include "base/threading/thread_restrictions.h"

namespace base {

#if defined(USE_LINUX_BREAKPAD)
size_t g_oom_size = 0U;
#endif

const char kProcSelfExe[] = "/proc/self/exe";

ProcessId GetParentProcessId(ProcessHandle process) {
  ProcessId pid =
      internal::ReadProcStatsAndGetFieldAsInt(process, internal::VM_PPID);
  if (pid)
    return pid;
  return -1;
}

FilePath GetProcessExecutablePath(ProcessHandle process) {
  FilePath stat_file = internal::GetProcPidDir(process).Append("exe");
  FilePath exe_name;
  if (!file_util::ReadSymbolicLink(stat_file, &exe_name)) {
    // No such process.  Happens frequently in e.g. TerminateAllChromeProcesses
    return FilePath();
  }
  return exe_name;
}

int GetNumberOfThreads(ProcessHandle process) {
  return internal::ReadProcStatsAndGetFieldAsInt(process,
                                                 internal::VM_NUMTHREADS);
}

}  // namespace base