swap.c

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