+#ifndef __NR_getrandom
+# if defined __x86_64__
+# define __NR_getrandom 318
+# elif defined(__i386__)
+# define __NR_getrandom 355
+# elif defined(__arm__) || defined(__aarch64__)
+# define __NR_getrandom 384
+# elif defined(__ia64__)
+# define __NR_getrandom 1339
+# elif defined(__m68k__)
+# define __NR_getrandom 352
+# elif defined(__s390x__)
+# define __NR_getrandom 349
+# else
+# warning "__NR_getrandom unknown for your architecture"
+# define __NR_getrandom 0xffffffff
+# endif
+#endif
+
+#if !HAVE_DECL_GETRANDOM
+static inline int getrandom(void *buffer, size_t count, unsigned flags) {
+ return syscall(__NR_getrandom, buffer, count, flags);
+}
+#endif
+
+#ifndef GRND_NONBLOCK
+#define GRND_NONBLOCK 0x0001
+#endif
+
+#ifndef GRND_RANDOM
+#define GRND_RANDOM 0x0002
+#endif
+