text: #include "node.h"
  #include "platform.h"
  
  #include <v8.h>
  
  #include <sys/param.h> // for MAXPATHLEN
  #include <sys/sysinfo.h>
  #include <unistd.h> // getpagesize, sysconf
  #include <stdio.h> // sscanf, snprintf
  #include <string.h>
  
  #include <windows.h>
  
  
  namespace node {
  
  using namespace v8;
  
  static char buf[MAXPATHLEN + 1];
  static char *process_title = NULL;
  
  
  // Does the about the same as perror(), but for windows api functions
  static void _winapi_perror(const char* prefix = NULL) {
    DWORD errorno = GetLastError();
    char *errmsg;
  
    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
                  NULL, errorno, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&errmsg, 0, NULL);
  
    // FormatMessage messages include a newline character
  
    if (prefix) {
      fprintf(stderr, "%s: %s", prefix, errmsg);
    } else {
      fputs(errmsg, stderr);
    }
  }
  
  
  char** Platform::SetupArgs(int argc, char *argv[]) {
    return argv;
  }
  
  
  void Platform::SetProcessTitle(char *title) {
    // We need to convert _title_ to UTF-16 first, because that's what windows uses internally.
    // It would be more efficient to use the UTF-16 value that we can obtain from v8,
    // but it's not accessible from here.
  
    // Max title length; according to the specs it should be 64K but in practice it's a little over 30000,
    // but who needs titles that long anyway?
    const int MAX_TITLE_LENGTH = 30001;
  
    int length;
    WCHAR *title_w;
  
    // Find out how big the buffer for the wide-char title must be
    length = MultiByteToWideChar(CP_UTF8, 0, title, -1, NULL, 0);
    if (!length) {
      _winapi_perror("MultiByteToWideChar");
      return;
    }
  
    // Convert to wide-char string
    title_w = new WCHAR[length];
    length = MultiByteToWideChar(CP_UTF8, 0, title, -1, title_w, length);
    if (!length) {
      _winapi_perror("MultiByteToWideChar");
      delete title_w;
      return;
    };
  
    // If the title must be truncated insert a \0 terminator there
    if (length > MAX_TITLE_LENGTH) {
      title_w[MAX_TITLE_LENGTH - 1] = *L"\0";
    }
  
    if (!SetConsoleTitleW(title_w)) {
      _winapi_perror("SetConsoleTitleW");
    }
  
    free(process_title);
    process_title = strdup(title);
  
    delete title_w;
  }
  
  
  static inline char* _getProcessTitle() {
    WCHAR *title_w;
    char *title;
    int length, length_w;
  
    length_w = GetConsoleTitleW((WCHAR*)L"\0", sizeof(WCHAR));
  
    // If length is zero, there may be an error or the title may be empty
    if (!length_w) {
      if (GetLastError()) {
        _winapi_perror("GetConsoleTitleW");
        return NULL;
      } else {
        // The title is empty, so return empty string
        process_title = strdup("\0");
        return process_title;
      }
    }
  
    // Room for \0 terminator
    length_w++;
  
    title_w = new WCHAR[length_w];
  
    if (!GetConsoleTitleW(title_w, length_w * sizeof(WCHAR))) {
      _winapi_perror("GetConsoleTitleW");
      delete title_w;
      return NULL;
    }
  
    // Find out what the size of the buffer is that we need
    length = WideCharToMultiByte(CP_UTF8, 0, title_w, length_w, NULL, 0, NULL, NULL);
    if (!length) {
      _winapi_perror("WideCharToMultiByte");
      delete title_w;
      return NULL;
    }
  
    title = (char *) malloc(length);
    if (!title) {
      perror("malloc");
      delete title_w;
      return NULL;
    }
  
    // Do utf16 -> utf8 conversion here
    if (!WideCharToMultiByte(CP_UTF8, 0, title_w, -1, title, length, NULL, NULL)) {
      _winapi_perror("WideCharToMultiByte");
      delete title_w;
      free(title);
      return NULL;
    }
  
    delete title_w;
  
    return title;
  }
  
  
  const char* Platform::GetProcessTitle(int *len) {
    // If the process_title was never read before nor explicitly set,
    // we must query it with getConsoleTitleW
    if (!process_title) {
      process_title = _getProcessTitle();
    }
  
    if (process_title) {
      *len = strlen(process_title);
      return process_title;
    } else {
      *len = 0;
      return NULL;
    }
  }
  
  
  int Platform::GetMemory(size_t *rss, size_t *vsize) {
    FILE *f = fopen("/proc/self/stat", "r");
    if (!f) return -1;
  
    int itmp;
    char ctmp;
    size_t page_size = getpagesize();
  
    /* PID */
    if (fscanf(f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Exec file */
    if (fscanf (f, "%s ", buf) == 0) goto error; /* coverity[secure_coding] */
    /* State */
    if (fscanf (f, "%c ", &ctmp) == 0) goto error; /* coverity[secure_coding] */
    /* Parent process */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Process group */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Session id */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* TTY */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* TTY owner process group */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Flags */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Minor faults (no memory page) */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Minor faults, children */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Major faults (memory page faults) */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Major faults, children */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* utime */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* stime */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* utime, children */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* stime, children */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* jiffies remaining in current time slice */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* 'nice' value */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* jiffies until next timeout */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* jiffies until next SIGALRM */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* start time (jiffies since system boot) */
    if (fscanf (f, "%d ", &itmp) == 0) goto error; /* coverity[secure_coding] */
  
    /* Virtual memory size */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    *vsize = (size_t) itmp;
  
    /* Resident set size */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    *rss = (size_t) itmp * page_size;
  
    /* rlim */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Start of text */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* End of text */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
    /* Start of stack */
    if (fscanf (f, "%u ", &itmp) == 0) goto error; /* coverity[secure_coding] */
  
    fclose (f);
  
    return 0;
  
  error:
    fclose (f);
    return -1;
  }
  
  
  int Platform::GetExecutablePath(char* buffer, size_t* size) {
    *size = readlink("/proc/self/exe", buffer, *size - 1);
    if (*size <= 0) return -1;
    buffer[*size] = '\0';
    return 0;
  }
  
  int Platform::GetCPUInfo(Local<Array> *cpus) {
    HandleScope scope;
    Local<Object> cpuinfo;
    Local<Object> cputimes;
    unsigned int ticks = (unsigned int)sysconf(_SC_CLK_TCK),
                 multiplier = ((uint64_t)1000L / ticks), cpuspeed;
    int numcpus = 0, i = 0;
    unsigned long long ticks_user, ticks_sys, ticks_idle, ticks_nice, ticks_intr;
    char line[512], speedPath[256], model[512];
    FILE *fpStat = fopen("/proc/stat", "r");
    FILE *fpModel = fopen("/proc/cpuinfo", "r");
    FILE *fpSpeed;
  
    if (fpModel) {
      while (fgets(line, 511, fpModel) != NULL) {
        if (strncmp(line, "model name", 10) == 0) {
          numcpus++;
          if (numcpus == 1) {
            char *p = strchr(line, ':') + 2;
            strcpy(model, p);
            model[strlen(model)-1] = 0;
          }
        } else if (strncmp(line, "cpu MHz", 7) == 0) {
          if (numcpus == 1) {
            sscanf(line, "%*s %*s : %u", &cpuspeed);
          }
        }
      }
      fclose(fpModel);
    }
  
    *cpus = Array::New(numcpus);
  
    if (fpStat) {
      while (fgets(line, 511, fpStat) != NULL) {
        if (strncmp(line, "cpu ", 4) == 0) {
          continue;
        } else if (strncmp(line, "cpu", 3) != 0) {
          break;
        }
  
        sscanf(line, "%*s %llu %llu %llu %llu",
               &ticks_user, &ticks_nice, &ticks_sys, &ticks_idle);
        snprintf(speedPath, sizeof(speedPath),
                 "/sys/devices/system/cpu/cpu%u/cpufreq/cpuinfo_max_freq", i);
  
        fpSpeed = fopen(speedPath, "r");
        if (fpSpeed) {
          if (fgets(line, 511, fpSpeed) != NULL) {
            sscanf(line, "%u", &cpuspeed);
            cpuspeed /= 1000;
          }
          fclose(fpSpeed);
        }
        cpuinfo = Object::New();
        cputimes = Object::New();
        cputimes->Set(String::New("user"), Number::New(ticks_user * multiplier));
        cputimes->Set(String::New("nice"), Number::New(ticks_nice * multiplier));
        cputimes->Set(String::New("sys"), Number::New(ticks_sys * multiplier));
        cputimes->Set(String::New("idle"), Number::New(ticks_idle * multiplier));
        cputimes->Set(String::New("irq"), Number::New(0));
  
        cpuinfo->Set(String::New("model"), String::New(model));
        cpuinfo->Set(String::New("speed"), Number::New(cpuspeed));
  
        cpuinfo->Set(String::New("times"), cputimes);
        (*cpus)->Set(i++, cpuinfo);
      }
      fclose(fpStat);
    }
  
    return 0;
  }
  
  double Platform::GetFreeMemory() {
    double pagesize = static_cast<double>(sysconf(_SC_PAGESIZE));
    double pages = static_cast<double>(sysconf(_SC_AVPHYS_PAGES));
  
    return static_cast<double>(pages * pagesize);
  }
  
  double Platform::GetTotalMemory() {
    double pagesize = static_cast<double>(sysconf(_SC_PAGESIZE));
    double pages = static_cast<double>(sysconf(_SC_PHYS_PAGES));
  
    return pages * pagesize;
  }
  
  double Platform::GetUptime() {
    double amount;
    char line[512];
    FILE *fpUptime = fopen("/proc/uptime", "r");
  
    if (fpUptime) {
      if (fgets(line, 511, fpUptime) != NULL) {
        sscanf(line, "%lf %*lf", &amount);
      }
      fclose(fpUptime);
    }
  
    return amount;
  }
  
  int Platform::GetLoadAvg(Local<Array> *loads) {
    // Unsupported as of cygwin 1.7.7
    return -1;
  }
  
  
  }  // namespace node
  