wmmemload/src/mem_openbsd.c

   1 /*
   2  * mem_openbsd.c - module to get memory/swap usages in percent, for OpenBSD
   3  *
   4  * Copyright (c) 2001 Seiichi SATO <ssato@sh.rim.or.jp>
   5  *
   6  * licensed under the GPL
   7  */
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include "config.h"
  11 #endif
  12
  13 #include <stdio.h>
  14 #include <unistd.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include "mem.h"
  18
  19 #include <sys/param.h>
  20 #include <sys/sysctl.h>
  21 #include <sys/swap.h>
  22
  23 /* initialize function */
  24 void
  25 mem_init(void)
  26 {
  27         return;
  28 }
  29
  30 /* get swap usage */
  31 static int
  32 get_swap_usage(void)
  33 {
  34         struct swapent *swap_dev;
  35         int num_swap;
  36         int stotal, sused, i;
  37
  38         stotal = sused = 0;
  39
  40         num_swap = swapctl(SWAP_NSWAP, 0, 0);
  41         if (num_swap == 0)
  42                 return 0;
  43
  44         swap_dev = malloc(num_swap * sizeof(*swap_dev));
  45         if (swap_dev  == NULL)
  46                 return 0;
  47
  48         if (swapctl(SWAP_STATS, swap_dev, num_swap) == -1)
  49                 return 0;
  50
  51         for (i = 0; i < num_swap; i++) {
  52                 if (swap_dev[i].se_flags & SWF_ENABLE) {
  53                         stotal += swap_dev[i].se_nblks;
  54                         sused += swap_dev[i].se_inuse;
  55                 }
  56         }
  57
  58         free(swap_dev);
  59
  60         if (sused == 0)
  61                 return 0;
  62
  63         return (100 * (double) sused / (double) stotal);
  64 }
  65
  66
  67 /* return mem/swap usage in percent 0 to 100 */
  68 void
  69 mem_getusage(int *per_mem, int *per_swap, const struct mem_options *opts)
  70 {
  71
  72         struct vmtotal vm;
  73         size_t size = sizeof(vm);
  74         static int mib[] = { CTL_VM, VM_METER };
  75
  76         /* get mem usage */
  77         if (sysctl(mib, 2, &vm, &size, NULL, 0) < 0)
  78                 bzero(&vm, sizeof(vm));
  79
  80         /* calc mem usage in percent */
  81         if (vm.t_rm > 0)
  82                 *per_mem = 100 * (double) vm.t_rm / (double) (vm.t_rm + vm.t_free);
  83
  84         if (*per_mem > 97)
  85                 *per_mem = 100;
  86
  87         /* swap */
  88         *per_swap = get_swap_usage();
  89
  90 #ifdef DEBUG
  91         printf("t_rm      total real memory in use     %6d\n", vm.t_rm);
  92         printf("t_arm     active real memory           %6d\n", vm.t_arm);
  93         printf("t_rmshr   shared real memory           %6d\n", vm.t_rmshr);
  94         printf("t_armshr  active shared real memory    %6d\n", vm.t_armshr);
  95         printf("t_free    free memory pages            %6d\n", vm.t_free);
  96 #endif
  97
  98         return;
  99 }