text: /* Copyright libuv project contributors. All rights reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to
   * deal in the Software without restriction, including without limitation the
   * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   * sell copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   * IN THE SOFTWARE.
   */
  
  #define _GNU_SOURCE 1
  
  #include "uv.h"
  #include "internal.h"
  
  #include <hurd.h>
  #include <hurd/process.h>
  #include <mach/task_info.h>
  #include <mach/vm_statistics.h>
  #include <mach/vm_param.h>
  
  #include <inttypes.h>
  #include <stddef.h>
  #include <unistd.h>
  #include <string.h>
  #include <limits.h>
  
  int uv_exepath(char* buffer, size_t* size) {
    kern_return_t err;
    /* XXX in current Hurd, strings are char arrays of 1024 elements */
    string_t exepath;
    ssize_t copied;
  
    if (buffer == NULL || size == NULL || *size == 0)
      return UV_EINVAL;
  
    if (*size - 1 > 0) {
      /* XXX limited length of buffer in current Hurd, this API will probably
       * evolve in the future */
      err = proc_get_exe(getproc(), getpid(), exepath);
  
      if (err)
        return UV__ERR(err);
    }
  
    copied = uv__strscpy(buffer, exepath, *size);
  
    /* do not return error on UV_E2BIG failure */
    *size = copied < 0 ? strlen(buffer) : (size_t) copied;
  
    return 0;
  }
  
  int uv_resident_set_memory(size_t* rss) {
    kern_return_t err;
    struct task_basic_info bi;
    mach_msg_type_number_t count;
  
    count = TASK_BASIC_INFO_COUNT;
    err = task_info(mach_task_self(), TASK_BASIC_INFO,
  		  (task_info_t) &bi, &count);
  
    if (err)
      return UV__ERR(err);
  
    *rss = bi.resident_size;
  
    return 0;
  }
  
  uint64_t uv_get_free_memory(void) {
    kern_return_t err;
    struct vm_statistics vmstats;
    
    err = vm_statistics(mach_task_self(), &vmstats);
  
    if (err)
      return 0;
    
    return vmstats.free_count * vm_page_size;
  }
  
  
  uint64_t uv_get_total_memory(void) {
    kern_return_t err;
    host_basic_info_data_t hbi;
    mach_msg_type_number_t cnt;
    
    cnt = HOST_BASIC_INFO_COUNT;
    err = host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t) &hbi, &cnt); 
  
    if (err)
      return 0;
  
    return hbi.memory_size;
  }
  
  
  int uv_uptime(double* uptime) {
    char buf[128];
  
    /* Try /proc/uptime first */
    if (0 == uv__slurp("/proc/uptime", buf, sizeof(buf)))
      if (1 == sscanf(buf, "%lf", uptime))
        return 0;
  
    /* Reimplement here code from procfs to calculate uptime if not mounted? */
  
    return UV__ERR(EIO);
  }
  
  void uv_loadavg(double avg[3]) {
    char buf[128];  /* Large enough to hold all of /proc/loadavg. */
  
    if (0 == uv__slurp("/proc/loadavg", buf, sizeof(buf)))
      if (3 == sscanf(buf, "%lf %lf %lf", &avg[0], &avg[1], &avg[2]))
        return;
  
    /* Reimplement here code from procfs to calculate loadavg if not mounted? */
  }
  
  
  int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count) {
    kern_return_t err;
    host_basic_info_data_t hbi;
    mach_msg_type_number_t cnt;
    
    /* Get count of cpus  */
    cnt = HOST_BASIC_INFO_COUNT;
    err = host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t) &hbi, &cnt); 
  
    if (err) {
      err = UV__ERR(err);
      goto abort;
    }
  
    /* XXX not implemented on the Hurd */
    *cpu_infos = uv__calloc(hbi.avail_cpus, sizeof(**cpu_infos));
    if (*cpu_infos == NULL) {
      err = UV_ENOMEM;
      goto abort;
    }
  
    *count = hbi.avail_cpus;
  
    return 0;
    
   abort:
    *cpu_infos = NULL;
    *count = 0;
    return err;
  }
  
  uint64_t uv_get_constrained_memory(void) {
    return 0;  /* Memory constraints are unknown. */
  }
  