/* Copyright (c) 2024, NVIDIA CORPORATION.  All rights reserved.
 *
 * NVIDIA Corporation and its licensors retain all intellectual property
 * and proprietary rights in and to this software, related documentation
 * and any modifications thereto.  Any use, reproduction, disclosure or
 * distribution of this software and related documentation without an express
 * license agreement from NVIDIA Corporation is strictly prohibited.
 */

#include "wsl_utils.h"

bool is_running_in_WSL(void)
{
  static volatile bool verified = false;
  static volatile bool ret = false;

  if (!verified) {
    verified = true;
    FILE *versionFile = fopen("/proc/version", "r");
    if (versionFile != NULL) {
      char versionInfo[512];
      if (fgets(versionInfo, sizeof(versionInfo), versionFile) != NULL) {
        for (int i=0; versionInfo[i] != '\0'; i++) {
          versionInfo[i] = tolower((unsigned char)versionInfo[i]);
        }
        if (strstr(versionInfo, "microsoft") != NULL) {
          /* Yes, Running inside WSL */
          ret = true;
        }
      }
      fclose(versionFile);
    } else {
      printf("ERROR: opening /proc/version failed\n");
    }
  }

  return ret;
}