libc-bottom-half/sources/getentropy.c

   1 #include <wasi/api.h>
   2 #include <errno.h>
   3 #include <unistd.h>
   4
   5 #ifdef _REENTRANT
   6 #error With threads support, getentropy is not intended to be a cancellation point.
   7 #endif
   8
   9 int __getentropy(void *buffer, size_t len) {
  10     if (len > 256) {
  11         errno = EIO;
  12         return -1;
  13     }
  14
  15     int r = __wasi_random_get(buffer, len);
  16
  17     if (r != 0) {
  18         errno = r;
  19         return -1;
  20     }
  21
  22     return 0;
  23 }
  24 extern __typeof(__getentropy) getentropy __attribute__((weak, alias("__getentropy")));