components/ram.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdio.h>
   3 #if defined (__OpenBSD__)
   4 #include <sys/types.h>
   5 #include <sys/sysctl.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #endif
   9
  10 #include "../util.h"
  11
  12 #if defined(__linux__)
  13 const char *
  14 ram_free(void)
  15 {
  16         long free;
  17
  18         return (pscanf("/proc/meminfo", "MemFree: %ld kB\n", &free) == 1) ?
  19                bprintf("%f", (float)free / 1024 / 1024) : NULL;
  20 }
  21
  22 const char *
  23 ram_perc(void)
  24 {
  25         long total, free, buffers, cached;
  26
  27         return (pscanf("/proc/meminfo",
  28                        "MemTotal: %ld kB\n"
  29                        "MemFree: %ld kB\n"
  30                        "MemAvailable: %ld kB\nBuffers: %ld kB\n"
  31                        "Cached: %ld kB\n",
  32                        &total, &free, &buffers, &buffers, &cached) == 5) ?
  33                bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total) :
  34                NULL;
  35 }
  36
  37 const char *
  38 ram_total(void)
  39 {
  40         long total;
  41
  42         return (pscanf("/proc/meminfo", "MemTotal: %ld kB\n", &total) == 1) ?
  43                bprintf("%f", (float)total / 1024 / 1024) : NULL;
  44 }
  45
  46 const char *
  47 ram_used(void)
  48 {
  49         long total, free, buffers, cached;
  50
  51         return (pscanf("/proc/meminfo",
  52                        "MemTotal: %ld kB\n"
  53                        "MemFree: %ld kB\n"
  54                        "MemAvailable: %ld kB\nBuffers: %ld kB\n"
  55                        "Cached: %ld kB\n",
  56                        &total, &free, &buffers, &buffers, &cached) == 5) ?
  57                bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024) :
  58                NULL;
  59 }
  60 #elif defined(__OpenBSD__)
  61 inline int
  62 load_uvmexp(struct uvmexp *uvmexp)
  63 {
  64         int uvmexp_mib[] = {CTL_VM, VM_UVMEXP};
  65         size_t size;
  66
  67         size = sizeof(*uvmexp);
  68
  69         return sysctl(uvmexp_mib, 2, uvmexp, &size, NULL, 0) >= 0 ? 1 : 0;
  70 }
  71
  72 const char *
  73 ram_free(void)
  74 {
  75         struct uvmexp uvmexp;
  76         float free;
  77         int free_pages;
  78
  79         if (load_uvmexp(&uvmexp)) {
  80                 free_pages = uvmexp.npages - uvmexp.active;
  81                 free = (double) (free_pages * uvmexp.pagesize) / 1024 / 1024 / 1024;
  82                 return bprintf("%f", free);
  83         }
  84
  85         return NULL;
  86 }
  87
  88 const char *
  89 ram_perc(void)
  90 {
  91         struct uvmexp uvmexp;
  92         int percent;
  93
  94         if (load_uvmexp(&uvmexp)) {
  95                 percent = uvmexp.active * 100 / uvmexp.npages;
  96                 return bprintf("%d", percent);
  97         }
  98
  99         return NULL;
 100 }
 101
 102 const char *
 103 ram_total(void)
 104 {
 105         struct uvmexp uvmexp;
 106         float total;
 107
 108         if (load_uvmexp(&uvmexp)) {
 109                 total = (double) (uvmexp.npages * uvmexp.pagesize) / 1024 / 1024 / 1024;
 110                 return bprintf("%f", total);
 111         }
 112
 113         return NULL;
 114 }
 115
 116 const char *
 117 ram_used(void)
 118 {
 119         struct uvmexp uvmexp;
 120         float used;
 121
 122         if (load_uvmexp(&uvmexp)) {
 123                 used = (double) (uvmexp.active * uvmexp.pagesize) / 1024 / 1024 / 1024;
 124                 return bprintf("%f", used);
 125         }
 126
 127         return NULL;
 128 }
 129 #endif