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                 return bprintf("%d", 100 * ((total - free) -
  40                                             (buffers + cached)) / total);
  41         }
  42
  43         const char *
  44         ram_total(void)
  45         {
  46                 uint64_t total;
  47
  48                 if (pscanf("/proc/meminfo", "MemTotal: %" PRIu64 " kB\n",
  49                            &total) != 1) {
  50                         return NULL;
  51                 }
  52
  53                 return fmt_human(total * 1024, 1024);
  54         }
  55
  56         const char *
  57         ram_used(void)
  58         {
  59                 uint64_t total, free, buffers, cached;
  60
  61                 if (pscanf("/proc/meminfo",
  62                            "MemTotal: %" PRIu64 " kB\n"
  63                            "MemFree: %" PRIu64 " kB\n"
  64                            "MemAvailable: %" PRIu64 " kB\nBuffers: %" PRIu64 " kB\n"
  65                            "Cached: %" PRIu64 " kB\n",
  66                            &total, &free, &buffers, &buffers, &cached) != 5) {
  67                         return NULL;
  68                 }
  69
  70                 return fmt_human((total - free - buffers - cached) * 1024,
  71                                  1024);
  72         }
  73 #elif defined(__OpenBSD__)
  74         #include <stdlib.h>
  75         #include <sys/sysctl.h>
  76         #include <sys/types.h>
  77         #include <unistd.h>
  78
  79         #define LOG1024         10
  80         #define pagetok(size, pageshift) (size_t)(size << (pageshift - LOG1024))
  81
  82         inline int
  83         load_uvmexp(struct uvmexp *uvmexp)
  84         {
  85                 int uvmexp_mib[] = {CTL_VM, VM_UVMEXP};
  86                 size_t size;
  87
  88                 size = sizeof(*uvmexp);
  89
  90                 if (sysctl(uvmexp_mib, 2, uvmexp, &size, NULL, 0) >= 0) {
  91                         return 1;
  92                 }
  93
  94                 return 0;
  95         }
  96
  97         const char *
  98         ram_free(void)
  99         {
 100                 struct uvmexp uvmexp;
 101                 int free_pages;
 102
 103                 if (load_uvmexp(&uvmexp)) {
 104                         free_pages = uvmexp.npages - uvmexp.active;
 105                         return fmt_human(pagetok(free_pages, uvmexp.pageshift) *
 106                                          1024, 1024);
 107                 }
 108
 109                 return NULL;
 110         }
 111
 112         const char *
 113         ram_perc(void)
 114         {
 115                 struct uvmexp uvmexp;
 116                 int percent;
 117
 118                 if (load_uvmexp(&uvmexp)) {
 119                         percent = uvmexp.active * 100 / uvmexp.npages;
 120                         return bprintf("%d", percent);
 121                 }
 122
 123                 return NULL;
 124         }
 125
 126         const char *
 127         ram_total(void)
 128         {
 129                 struct uvmexp uvmexp;
 130
 131                 if (load_uvmexp(&uvmexp)) {
 132                         return fmt_human(pagetok(uvmexp.npages,
 133                                                  uvmexp.pageshift) * 1024,
 134                                          1024);
 135                 }
 136
 137                 return NULL;
 138         }
 139
 140         const char *
 141         ram_used(void)
 142         {
 143                 struct uvmexp uvmexp;
 144
 145                 if (load_uvmexp(&uvmexp)) {
 146                         return fmt_human(pagetok(uvmexp.active,
 147                                                  uvmexp.pageshift) * 1024,
 148                                          1024);
 149                 }
 150
 151                 return NULL;
 152         }
 153 #endif