swap.c

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