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 <sys/types.h>
#include <pwd.h>
#include <unistd.h>
#include <stdlib.h>
 
#include <iterator>
 
#include <ers/LocalContext.hpp>
 
#if !defined(__APPLE__) && !defined(__rtems__)
#include <sys/syscall.h>
#include <execinfo.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());