如何在c侧获取系统空间

static napi_value TotalDisk(napi_env env, napi_callback_info info) { 
  uint32_t size = loadSystemMemory::LoadSystemMemoryFunc(); 
  napi_value sum; 
  napi_create_int64(env, size, &sum); 
  return sum; 
}

#include "loadSystemMemory.h" 
#include <cstdio> 
#include <cstdlib> 
#include <cstring> 
   
uint32_t loadSystemMemory::LoadSystemMemoryFunc() { 
  FILE *fp = fopen("/proc/meminfo", "r"); 
  if (fp == NULL) { 
    return 0; 
  } 
   
  char line[1024]; 
  long total_memory = 0; 
   
  while (fgets(line, sizeof(line), fp)) { 
    if (strncmp(line, "MemTotal:", 9) == 0) { 
      char *end; 
      total_memory = strtol(line + 9, &end, 10) / (1024 * 1024); // 假设单位是kB，转换为GB 
      break; 
    } 
  }   
  fclose(fp); 
  return total_memory; 
}

#include <cstdint> 
 
class loadSystemMemory { 
  public: 
    static uint32_t LoadSystemMemoryFunc(); 
};

import testNapi from 'libentry.so'; 
 
let size = testNapi.totalDisk(); 
console.log("内存大小为" + size + "GB")