libc-bottom-half/sources/getentropy.c

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