Function patchUserEnv

src/execwrappers.cpp:575–642

}

static vector<string>
patchUserEnv(const char *env[], const char *filename)
{
  vector<string>result;
  string userPreloadStr;

  ostringstream out;
  out << "non-DMTCP env vars:\n";

  for (size_t i = 0; env[i] != NULL; i++) {
    if (isImportantEnv(env[i])) {
      if (dbg) {
        out << "     skipping: " << env[i] << '\n';
      }
      continue;
    }
    if (Util::strStartsWith(env[i], "LD_PRELOAD=")) {
      userPreloadStr = &env[i][strlen("LD_PRELOAD=")];
      continue;
    }

    result.push_back(env[i]);
    if (dbg) {
      out << "     addenv[user]:" << result.back() << '\n';
    }
  }
  JTRACE("Creating a copy of (non-DMTCP) user env vars...") (out.str());

  // pack up our ENV into the new ENV
  out.str("DMTCP env vars:\n");
  for (size_t i = 0; i < ourImportantEnvsCnt; ++i) {
    const char *v = getenv(ourImportantEnvs[i]);
    const string e = ourImportantEnvs[i];
    if (e == ENV_VAR_ORIG_LD_PRELOAD && !userPreloadStr.empty()) {
      result.push_back(e + "=" + userPreloadStr);
    } else if (v != NULL) {
      result.push_back(e + '=' + v);
      if (dbg) {
        out << "     addenv[dmtcp]:" << result.back() << '\n';
      }
    }
  }

  string ldPreloadStr = "LD_PRELOAD=";
  ldPreloadStr += getUpdatedLdPreload(filename, userPreloadStr.c_str());

  result.push_back(ldPreloadStr);

  /*
   * The path virtualization plugin tries to set the new prefix env var on
   * restart. However, for some applications (e.g. bash), setenv() won't affect
   * the envp area, possibly because the application has its private copy of
   * the env vars. We need to patch the right env vars before calling execve().
   * */
  if (getenv("DMTCP_NEW_PATH_PREFIX")) {
    string pathVirt = "DMTCP_NEW_PATH_PREFIX=";
    pathVirt += getenv("DMTCP_NEW_PATH_PREFIX");
    result.push_back(pathVirt);