LocalContext.cpp

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/*
 * DUNE DAQ modification notice:
 * This file has been modified from the original ATLAS ers source for the DUNE DAQ project.
 * Fork baseline commit: 8267df82a4f6fe6bf02c4014923eba19eddc4614 (2020-04-14).
 * Renamed since fork: yes (from src/LocalContext.cxx to src/LocalContext.cpp).
 *
 * Original copyright:
 * Copyright (C) 2001-2020 CERN for the benefit of the ATLAS collaboration.
 * Licensed under the Apache License, Version 2.0.
 */
 
/*
 *  LocalContext.cxx
 *  ers
 *
 *  Created by Serguei Kolos on 26.11.05.
 *  Copyright 2004 CERN. All rights reserved.
 *
 */
#include <pwd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
 
#include <iterator>
 
#include <ers/LocalContext.hpp>
 
#if !defined(__APPLE__) && !defined(__rtems__)
#include <execinfo.h>
#include <sys/syscall.h>
#else
int
backtrace(void**, int)
{
  return 0;
}
#endif
 
pid_t
gettid()
{
#if !defined(__APPLE__) && !defined(__rtems__)
  return syscall(SYS_gettid);
#else
  return 0;
#endif
}
 
namespace {
const char*
get_cwd()
{
  static std::string buf;
  if (buf.empty()) {
    char tmp[1024];
    if (::getcwd(tmp, sizeof(tmp)))
      buf = tmp;
  }
  return buf.c_str();
}
 
const char*
get_user_name()
{
  static std::string buf;
  if (buf.empty()) {
    struct passwd* psw = ::getpwuid(geteuid());
    if (psw)
      buf = psw->pw_name;
  }
  return buf.c_str();
}
 
const char*
get_host_name()
{
  static std::string buf;
  if (buf.empty()) {
    char tmp[1024];
    if (!::gethostname(tmp, sizeof(tmp)))
      buf = tmp;
  }
  return buf.c_str();
}
}
 
ers::LocalContext::LocalContext(const char* package_name,
                                const char* filename,
                                int line_number,
                                const char* function_name,
                                bool debug)
  : m_package_name(package_name)
  , m_file_name(filename)
  , m_function_name(function_name)
  , m_line_number(line_number)
  , m_thread_id(gettid())
  , m_stack_size(debug ? backtrace(m_stack, std::size(m_stack)) : 0)
{
  ;
}
 
const char*
ers::LocalContext::application_name() const
{
  static int pid = ::getpid();
  static const char* env = ::getenv("DUNEDAQ_APPLICATION_NAME") ? ::getenv("DUNEDAQ_APPLICATION_NAME") : "Undefined";
 
  if (pid != ::getpid()) {
    pid = ::getpid();
    env = ::getenv("DUNEDAQ_APPLICATION_NAME") ? ::getenv("DUNEDAQ_APPLICATION_NAME") : "Undefined";
  }
  return env;
}
 
const ers::LocalProcessContext ers::LocalContext::c_process(get_host_name(), get_cwd(), geteuid(), get_user_name());