components/ram.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdio.h>
   3
   4 #include "../util.h"
   5
   6 #if defined(__linux__)
   7         #include <inttypes.h>
   8
   9         const char *
  10         ram_free(void)
  11         {
  12                 uint64_t free;
  13
  14                 if (pscanf("/proc/meminfo",
  15                            "MemTotal: %" PRIu64 " kB\n"
  16                            "MemFree: %" PRIu64 " kB\n"
  17                            "MemAvailable: %" PRIu64 " kB\n",
  18                            &free, &free, &free) != 3) {
  19                         return NULL;
  20                 }
  21
  22                 return fmt_human(free * 1024, 1024);
  23         }
  24
  25         const char *
  26         ram_perc(void)
  27         {
  28                 uint64_t total, free, buffers, cached;
  29
  30                 if (pscanf("/proc/meminfo",
  31                            "MemTotal: %" PRIu64 " kB\n"
  32                            "MemFree: %" PRIu64 " kB\n"
  33                            "MemAvailable: %" PRIu64 " kB\nBuffers: %ld kB\n"
  34                            "Cached: %" PRIu64 " kB\n",
  35                            &total, &free, &buffers, &buffers, &cached) != 5) {
  36                         return NULL;
  37                 }
  38
  39                 if (total == 0) {
  40                         return NULL;
  41                 }
  42
  43                 return bprintf("%d", 100 * ((total - free) -
  44                                             (buffers + cached)) / total);
  45         }
  46
  47         const char *
  48         ram_total(void)
  49         {
  50                 uint64_t total;
  51
  52                 if (pscanf("/proc/meminfo", "MemTotal: %" PRIu64 " kB\n",
  53                            &total) != 1) {
  54                         return NULL;
  55                 }
  56
  57                 return fmt_human(total * 1024, 1024);
  58         }
  59
  60         const char *
  61         ram_used(void)
  62         {
  63                 uint64_t total, free, buffers, cached;
  64
  65                 if (pscanf("/proc/meminfo",
  66                            "MemTotal: %" PRIu64 " kB\n"
  67                            "MemFree: %" PRIu64 " kB\n"
  68                            "MemAvailable: %" PRIu64 " kB\nBuffers: %" PRIu64 " kB\n"
  69                            "Cached: %" PRIu64 " kB\n",
  70                            &total, &free, &buffers, &buffers, &cached) != 5) {
  71                         return NULL;
  72                 }
  73
  74                 return fmt_human((total - free - buffers - cached) * 1024,
  75                                  1024);
  76         }
  77 #elif defined(__OpenBSD__)
  78         #include <stdlib.h>
  79         #include <sys/sysctl.h>
  80         #include <sys/types.h>
  81         #include <unistd.h>
  82
  83         #define LOG1024         10
  84         #define pagetok(size, pageshift) (size_t)(size << (pageshift - LOG1024))
  85
  86         inline int
  87         load_uvmexp(struct uvmexp *uvmexp)
  88         {
  89                 int uvmexp_mib[] = {CTL_VM, VM_UVMEXP};
  90                 size_t size;
  91
  92                 size = sizeof(*uvmexp);
  93
  94                 if (sysctl(uvmexp_mib, 2, uvmexp, &size, NULL, 0) >= 0) {
  95                         return 1;
  96                 }
  97
  98                 return 0;
  99         }
 100
 101         const char *
 102         ram_free(void)
 103         {
 104                 struct uvmexp uvmexp;
 105                 int free_pages;
 106
 107                 if (load_uvmexp(&uvmexp)) {
 108                         free_pages = uvmexp.npages - uvmexp.active;
 109                         return fmt_human(pagetok(free_pages, uvmexp.pageshift) *
 110                                          1024, 1024);
 111                 }
 112
 113                 return NULL;
 114         }
 115
 116         const char *
 117         ram_perc(void)
 118         {
 119                 struct uvmexp uvmexp;
 120                 int percent;
 121
 122                 if (load_uvmexp(&uvmexp)) {
 123                         percent = uvmexp.active * 100 / uvmexp.npages;
 124                         return bprintf("%d", percent);
 125                 }
 126
 127                 return NULL;
 128         }
 129
 130         const char *
 131         ram_total(void)
 132         {
 133                 struct uvmexp uvmexp;
 134
 135                 if (load_uvmexp(&uvmexp)) {
 136                         return fmt_human(pagetok(uvmexp.npages,
 137                                                  uvmexp.pageshift) * 1024,
 138                                          1024);
 139                 }
 140
 141                 return NULL;
 142         }
 143
 144         const char *
 145         ram_used(void)
 146         {
 147                 struct uvmexp uvmexp;
 148
 149                 if (load_uvmexp(&uvmexp)) {
 150                         return fmt_human(pagetok(uvmexp.active,
 151                                                  uvmexp.pageshift) * 1024,
 152                                          1024);
 153                 }
 154
 155                 return NULL;
 156         }
 157 #endif