/*
 * eset_rtp (ESET Real-time file system protection module)
 * Copyright (C) 1992-2023 ESET, spol. s r.o.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * In case of any questions, you can contact us at ESET, spol. s r.o., Einsteinova 24, 851 01 Bratislava, Slovakia.
 */

#include "ertp_scanner.h"
#include "ertp_logs.h"

struct ertp_scanner escanner = {.tgid = ATOMIC_INIT(-1)};

static inline int ertp_no_scanner(void) {
  return atomic_read(&escanner.tgid) == -1;
}

int ertp_scanner_register(pid_t tgid) {
  if (!ertp_no_scanner()) return -EEXIST;

  ertp_pr_log(ERTP_LOG_EVENTS, "registering new scanner with pid(tgid) %d",
              tgid);
  atomic_set(&escanner.tgid, tgid);

  return 0;
}

void ertp_scanner_unregister(void) {
  if (ertp_no_scanner()) return;

  ertp_pr_log(ERTP_LOG_EVENTS, "unregistering scanner with pid(tgid) %d",
              atomic_read(&escanner.tgid));
  atomic_set(&escanner.tgid, -1);
}