sys/src/libc/9sys/truerand.c

   1 #include <u.h>
   2 #include <libc.h>
   3
   4 ulong
   5 truerand(void)
   6 {
   7         ulong x;
   8         static int randfd = -1;
   9
  10         if(randfd < 0)
  11                 randfd = open("/dev/random", OREAD|OCEXEC);
  12         if(randfd < 0)
  13                 sysfatal("can't open /dev/random");
  14         if(read(randfd, &x, sizeof(x)) != sizeof(x))
  15                 sysfatal("can't read /dev/random");
  16         return x;
  17 }