components/entropy.c

   1 /* See LICENSE file for copyright and license details. */
   2 #if defined(__linux__)
   3         #include <stdio.h>
   4
   5         #include "../util.h"
   6
   7         const char *
   8         entropy(void)
   9         {
  10                 int num;
  11
  12                 if (pscanf("/proc/sys/kernel/random/entropy_avail",
  13                            "%d", &num) != 1) {
  14                         return NULL;
  15                 }
  16
  17                 return bprintf("%d", num);
  18         }
  19 #elif defined(__OpenBSD__)
  20         const char *
  21         entropy(void)
  22         {
  23                 /* Unicode Character 'INFINITY' (U+221E) */
  24                 return "\xe2\x88\x9e";
  25         }
  26 #endif