components/swap.c

   1 /* See LICENSE file for copyright and license details. */
   2 #if defined(__linux__)
   3 #include <err.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6
   7 #include "../util.h"
   8
   9 const char *
  10 swap_free(void)
  11 {
  12         long total, free;
  13         FILE *fp;
  14         size_t bytes_read;
  15         char *match;
  16
  17         fp = fopen("/proc/meminfo", "r");
  18         if (fp == NULL) {
  19                 warn("Failed to open file /proc/meminfo");
  20                 return NULL;
  21         }
  22
  23         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
  24                 warn("swap_free: read error");
  25                 fclose(fp);
  26                 return NULL;
  27         }
  28         fclose(fp);
  29
  30         if ((match = strstr(buf, "SwapTotal")) == NULL)
  31                 return NULL;
  32         sscanf(match, "SwapTotal: %ld kB\n", &total);
  33
  34         if ((match = strstr(buf, "SwapFree")) == NULL)
  35                 return NULL;
  36         sscanf(match, "SwapFree: %ld kB\n", &free);
  37
  38         return bprintf("%f", (float)free / 1024 / 1024);
  39 }
  40
  41 const char *
  42 swap_perc(void)
  43 {
  44         long total, free, cached;
  45         FILE *fp;
  46         size_t bytes_read;
  47         char *match;
  48
  49         fp = fopen("/proc/meminfo", "r");
  50         if (fp == NULL) {
  51                 warn("Failed to open file /proc/meminfo");
  52                 return NULL;
  53         }
  54
  55         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
  56                 warn("swap_perc: read error");
  57                 fclose(fp);
  58                 return NULL;
  59         }
  60         fclose(fp);
  61
  62         if ((match = strstr(buf, "SwapTotal")) == NULL)
  63                 return NULL;
  64         sscanf(match, "SwapTotal: %ld kB\n", &total);
  65
  66         if ((match = strstr(buf, "SwapCached")) == NULL)
  67                 return NULL;
  68         sscanf(match, "SwapCached: %ld kB\n", &cached);
  69
  70         if ((match = strstr(buf, "SwapFree")) == NULL)
  71                 return NULL;
  72         sscanf(match, "SwapFree: %ld kB\n", &free);
  73
  74         return bprintf("%d", 100 * (total - free - cached) / total);
  75 }
  76
  77 const char *
  78 swap_total(void)
  79 {
  80         long total;
  81         FILE *fp;
  82         size_t bytes_read;
  83         char *match;
  84
  85         fp = fopen("/proc/meminfo", "r");
  86         if (fp == NULL) {
  87                 warn("Failed to open file /proc/meminfo");
  88                 return NULL;
  89         }
  90         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
  91                 warn("swap_total: read error");
  92                 fclose(fp);
  93                 return NULL;
  94         }
  95         fclose(fp);
  96
  97         if ((match = strstr(buf, "SwapTotal")) == NULL)
  98                 return NULL;
  99         sscanf(match, "SwapTotal: %ld kB\n", &total);
 100
 101         return bprintf("%f", (float)total / 1024 / 1024);
 102 }
 103
 104 const char *
 105 swap_used(void)
 106 {
 107         long total, free, cached;
 108         FILE *fp;
 109         size_t bytes_read;
 110         char *match;
 111
 112         fp = fopen("/proc/meminfo", "r");
 113         if (fp == NULL) {
 114                 warn("Failed to open file /proc/meminfo");
 115                 return NULL;
 116         }
 117         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 118                 warn("swap_used: read error");
 119                 fclose(fp);
 120                 return NULL;
 121         }
 122         fclose(fp);
 123
 124         if ((match = strstr(buf, "SwapTotal")) == NULL)
 125                 return NULL;
 126         sscanf(match, "SwapTotal: %ld kB\n", &total);
 127
 128         if ((match = strstr(buf, "SwapCached")) == NULL)
 129                 return NULL;
 130         sscanf(match, "SwapCached: %ld kB\n", &cached);
 131
 132         if ((match = strstr(buf, "SwapFree")) == NULL)
 133                 return NULL;
 134         sscanf(match, "SwapFree: %ld kB\n", &free);
 135
 136         return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 137 }
 138 #endif