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     if ((num_swap = swapctl(SWAP_NSWAP, 0, 0)) == 0)
  41         return 0;
  42
  43     if ((swap_dev = malloc(num_swap * sizeof(*swap_dev))) == NULL)
  44         return 0;
  45
  46     if (swapctl(SWAP_STATS, swap_dev, num_swap) == -1)
  47         return 0;
  48
  49     for (i = 0; i < num_swap; i++) {
  50         if (swap_dev[i].se_flags & SWF_ENABLE) {
  51             stotal += swap_dev[i].se_nblks;
  52             sused += swap_dev[i].se_inuse;
  53         }
  54     }
  55
  56     free(swap_dev);
  57
  58     if (sused == 0)
  59         return 0;
  60
  61     return (100 * (double) sused / (double) stotal);
  62 }
  63
  64
  65 /* return mem/swap usage in percent 0 to 100 */
  66 void
  67 mem_getusage(int *per_mem, int *per_swap, const struct mem_options *opts)
  68 {
  69
  70     struct vmtotal vm;
  71     size_t size = sizeof(vm);
  72     static int mib[] = { CTL_VM, VM_METER };
  73
  74     /* get mem usage */
  75     if (sysctl(mib, 2, &vm, &size, NULL, 0) < 0)
  76         bzero(&vm, sizeof(vm));
  77
  78     /* calc mem usage in percent */
  79     if (vm.t_rm > 0)
  80         *per_mem = 100 * (double) vm.t_rm / (double) (vm.t_rm + vm.t_free);
  81
  82     if (*per_mem > 97) *per_mem = 100;
  83
  84     /* swap */
  85     *per_swap = get_swap_usage();
  86
  87 #ifdef DEBUG
  88     printf("t_rm      total real memory in use     %6d\n", vm.t_rm);
  89     printf("t_arm     active real memory           %6d\n", vm.t_arm);
  90     printf("t_rmshr   shared real memory           %6d\n", vm.t_rmshr);
  91     printf("t_armshr  active shared real memory    %6d\n", vm.t_armshr);
  92     printf("t_free    free memory pages            %6d\n", vm.t_free);
  93 #endif
  94
  95     return;
  96 }