text: /* Copyright Joyent, Inc. and other Node 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.
   */
  
  #include "uv.h"
  #include "internal.h"
  
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/resource.h>
  #include <sys/sched.h>
  #include <sys/time.h>
  #include <sys/sysctl.h>
  
  #include <ifaddrs.h>
  #include <net/if.h>
  #include <net/if_dl.h>
  
  #include <errno.h>
  #include <fcntl.h>
  #include <kvm.h>
  #include <paths.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #undef NANOSEC
  #define NANOSEC ((uint64_t) 1e9)
  
  
  static char *process_title;
  
  
  int uv__platform_loop_init(uv_loop_t* loop, int default_loop) {
    return uv__kqueue_init(loop);
  }
  
  
  void uv__platform_loop_delete(uv_loop_t* loop) {
  }
  
  
  uint64_t uv__hrtime(uv_clocktype_t type) {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (((uint64_t) ts.tv_sec) * NANOSEC + ts.tv_nsec);
  }
  
  
  void uv_loadavg(double avg[3]) {
    struct loadavg info;
    size_t size = sizeof(info);
    int which[] = {CTL_VM, VM_LOADAVG};
  
    if (sysctl(which, 2, &info, &size, NULL, 0) < 0) return;
  
    avg[0] = (double) info.ldavg[0] / info.fscale;
    avg[1] = (double) info.ldavg[1] / info.fscale;
    avg[2] = (double) info.ldavg[2] / info.fscale;
  }
  
  
  int uv_exepath(char* buffer, size_t* size) {
    int mib[4];
    char **argsbuf = NULL;
    char **argsbuf_tmp;
    size_t argsbuf_size = 100U;
    size_t exepath_size;
    pid_t mypid;
    int err;
  
    if (buffer == NULL || size == NULL)
      return -EINVAL;
  
    mypid = getpid();
    for (;;) {
      err = -ENOMEM;
      argsbuf_tmp = realloc(argsbuf, argsbuf_size);
      if (argsbuf_tmp == NULL)
        goto out;
      argsbuf = argsbuf_tmp;
      mib[0] = CTL_KERN;
      mib[1] = KERN_PROC_ARGS;
      mib[2] = mypid;
      mib[3] = KERN_PROC_ARGV;
      if (sysctl(mib, 4, argsbuf, &argsbuf_size, NULL, 0) == 0) {
        break;
      }
      if (errno != ENOMEM) {
        err = -errno;
        goto out;
      }
      argsbuf_size *= 2U;
    }
    if (argsbuf[0] == NULL) {
      err = -EINVAL;  /* FIXME(bnoordhuis) More appropriate error. */
      goto out;
    }
    exepath_size = strlen(argsbuf[0]);
    if (exepath_size >= *size) {
      err = -EINVAL;
      goto out;
    }
    memcpy(buffer, argsbuf[0], exepath_size + 1U);
    *size = exepath_size;
    err = 0;
  
  out:
    free(argsbuf);
  
    return err;
  }
  
  
  uint64_t uv_get_free_memory(void) {
    struct uvmexp info;
    size_t size = sizeof(info);
    int which[] = {CTL_VM, VM_UVMEXP};
  
    if (sysctl(which, 2, &info, &size, NULL, 0))
      return -errno;
  
    return (uint64_t) info.free * sysconf(_SC_PAGESIZE);
  }
  
  
  uint64_t uv_get_total_memory(void) {
    uint64_t info;
    int which[] = {CTL_HW, HW_PHYSMEM64};
    size_t size = sizeof(info);
  
    if (sysctl(which, 2, &info, &size, NULL, 0))
      return -errno;
  
    return (uint64_t) info;
  }
  
  
  char** uv_setup_args(int argc, char** argv) {
    process_title = argc ? strdup(argv[0]) : NULL;
    return argv;
  }
  
  
  int uv_set_process_title(const char* title) {
    if (process_title) free(process_title);
    process_title = strdup(title);
    setproctitle(title);
    return 0;
  }
  
  
  int uv_get_process_title(char* buffer, size_t size) {
    if (process_title) {
      strncpy(buffer, process_title, size);
    } else {
      if (size > 0) {
        buffer[0] = '\0';
      }
    }
  
    return 0;
  }
  
  
  int uv_resident_set_memory(size_t* rss) {
    struct kinfo_proc kinfo;
    size_t page_size = getpagesize();
    size_t size = sizeof(struct kinfo_proc);
    int mib[6];
  
    mib[0] = CTL_KERN;
    mib[1] = KERN_PROC;
    mib[2] = KERN_PROC_PID;
    mib[3] = getpid();
    mib[4] = sizeof(struct kinfo_proc);
    mib[5] = 1;
  
    if (sysctl(mib, 6, &kinfo, &size, NULL, 0) < 0)
      return -errno;
  
    *rss = kinfo.p_vm_rssize * page_size;
    return 0;
  }
  
  
  int uv_uptime(double* uptime) {
    time_t now;
    struct timeval info;
    size_t size = sizeof(info);
    static int which[] = {CTL_KERN, KERN_BOOTTIME};
  
    if (sysctl(which, 2, &info, &size, NULL, 0))
      return -errno;
  
    now = time(NULL);
  
    *uptime = (double)(now - info.tv_sec);
    return 0;
  }
  
  
  int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count) {
    unsigned int ticks = (unsigned int)sysconf(_SC_CLK_TCK),
                 multiplier = ((uint64_t)1000L / ticks), cpuspeed;
    uint64_t info[CPUSTATES];
    char model[512];
    int numcpus = 1;
    int which[] = {CTL_HW,HW_MODEL,0};
    size_t size;
    int i;
    uv_cpu_info_t* cpu_info;
  
    size = sizeof(model);
    if (sysctl(which, 2, &model, &size, NULL, 0))
      return -errno;
  
    which[1] = HW_NCPU;
    size = sizeof(numcpus);
    if (sysctl(which, 2, &numcpus, &size, NULL, 0))
      return -errno;
  
    *cpu_infos = malloc(numcpus * sizeof(**cpu_infos));
    if (!(*cpu_infos))
      return -ENOMEM;
  
    *count = numcpus;
  
    which[1] = HW_CPUSPEED;
    size = sizeof(cpuspeed);
    if (sysctl(which, 2, &cpuspeed, &size, NULL, 0)) {
      SAVE_ERRNO(free(*cpu_infos));
      return -errno;
    }
  
    size = sizeof(info);
    which[0] = CTL_KERN;
    which[1] = KERN_CPTIME2;
    for (i = 0; i < numcpus; i++) {
      which[2] = i;
      size = sizeof(info);
      if (sysctl(which, 3, &info, &size, NULL, 0)) {
        SAVE_ERRNO(free(*cpu_infos));
        return -errno;
      }
  
      cpu_info = &(*cpu_infos)[i];
  
      cpu_info->cpu_times.user = (uint64_t)(info[CP_USER]) * multiplier;
      cpu_info->cpu_times.nice = (uint64_t)(info[CP_NICE]) * multiplier;
      cpu_info->cpu_times.sys = (uint64_t)(info[CP_SYS]) * multiplier;
      cpu_info->cpu_times.idle = (uint64_t)(info[CP_IDLE]) * multiplier;
      cpu_info->cpu_times.irq = (uint64_t)(info[CP_INTR]) * multiplier;
  
      cpu_info->model = strdup(model);
      cpu_info->speed = cpuspeed;
    }
  
    return 0;
  }
  
  
  void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count) {
    int i;
  
    for (i = 0; i < count; i++) {
      free(cpu_infos[i].model);
    }
  
    free(cpu_infos);
  }
  
  
  int uv_interface_addresses(uv_interface_address_t** addresses,
    int* count) {
    struct ifaddrs *addrs, *ent;
    uv_interface_address_t* address;
    int i;
    struct sockaddr_dl *sa_addr;
  
    if (getifaddrs(&addrs) != 0)
      return -errno;
  
     *count = 0;
  
    /* Count the number of interfaces */
    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
      if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
          (ent->ifa_addr == NULL) ||
          (ent->ifa_addr->sa_family != PF_INET)) {
        continue;
      }
      (*count)++;
    }
  
    *addresses = malloc(*count * sizeof(**addresses));
  
    if (!(*addresses))
      return -ENOMEM;
  
    address = *addresses;
  
    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
      if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
        continue;
  
      if (ent->ifa_addr == NULL)
        continue;
  
      if (ent->ifa_addr->sa_family != PF_INET)
        continue;
  
      address->name = strdup(ent->ifa_name);
  
      if (ent->ifa_addr->sa_family == AF_INET6) {
        address->address.address6 = *((struct sockaddr_in6*) ent->ifa_addr);
      } else {
        address->address.address4 = *((struct sockaddr_in*) ent->ifa_addr);
      }
  
      if (ent->ifa_netmask->sa_family == AF_INET6) {
        address->netmask.netmask6 = *((struct sockaddr_in6*) ent->ifa_netmask);
      } else {
        address->netmask.netmask4 = *((struct sockaddr_in*) ent->ifa_netmask);
      }
  
      address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);
  
      address++;
    }
  
    /* Fill in physical addresses for each interface */
    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
      if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
          (ent->ifa_addr == NULL) ||
          (ent->ifa_addr->sa_family != AF_LINK)) {
        continue;
      }
  
      address = *addresses;
  
      for (i = 0; i < (*count); i++) {
        if (strcmp(address->name, ent->ifa_name) == 0) {
          sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
          memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
        }
        address++;
      }
    }
  
    freeifaddrs(addrs);
  
    return 0;
  }
  
  
  void uv_free_interface_addresses(uv_interface_address_t* addresses,
    int count) {
    int i;
  
    for (i = 0; i < count; i++) {
      free(addresses[i].name);
    }
  
    free(addresses);
  }
  