G4FindDataDir.cc File Reference

#include <mutex>
#include "G4FindDataDir.hh"
#include "G4Filesystem.hh"
#include "G4Exception.hh"
#include <cstdio>
#include <cstdlib>
#include <cstring>

Go to the source code of this file.

Functions
const char *	G4FindDataDir (const char *name)

Function Documentation

G4FindDataDir()

const char * G4FindDataDir

(

const char *

name

)

Definition at line 94 of file G4FindDataDir.cc.

{
#if defined(G4MULTITHREADED)
  static std::mutex mutex;
  std::lock_guard<std::mutex> lock(mutex);
#endif
 
  /* If environment variable is set for this dataset, use it */
  if (const char *datadir = std::getenv(name))
    return datadir;
 
  /* If we know which directory/version to search for, try to find it */
  if (const char *dataset = G4GetDataDir(name)) {
    /* If GEANT4_DATA_DIR environment variable is set, use it and don't search further */
    if (const char *basedir = std::getenv("GEANT4_DATA_DIR")) {
      if (is_directory(basedir)) return G4FindDataDir(name, basedir, dataset);
 
      G4Exception("G4FindDataDir", "Invalid GEANT4_DATA_DIR", JustWarning, "The GEANT4_DATA_DIR environment variable points to an invalid directory.\n"
                  "Will try fallback locations now. Correct the variable to disable this behaviour.");
    }
 
    /* If GEANT4_DATA_DIR environment variable is not set, search in default system paths */
    for (const auto prefix : system_paths)
      if (const auto datadir = G4FindDataDir(name, prefix, dataset))
        return datadir;
  }
 
  return nullptr;
}

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