+ /*
+ * On FreeBSD old implementations returned longs, newer versions support
+ * variable sizes up to 256 byte. The code below would not work properly
+ * when the sysctl returns long and we want to request something not a
+ * multiple of longs, which should never be the case.
+ */
+ if (!ossl_assert(buflen % sizeof(long) == 0)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /*
+ * On NetBSD before 4.0 KERN_ARND was an alias for KERN_URND, and only
+ * filled in an int, leaving the rest uninitialized. Since NetBSD 4.0
+ * it returns a variable number of bytes with the current version supporting
+ * up to 256 bytes.
+ * Just return an error on older NetBSD versions.
+ */
+#if defined(__NetBSD__) && __NetBSD_Version__ < 400000000
+ errno = ENOSYS;
+ return -1;
+#endif
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_ARND;
+
+ do {
+ len = buflen;
+ if (sysctl(mib, 2, buf, &len, NULL, 0) == -1)
+ return done > 0 ? done : -1;
+ done += len;
+ buf += len;
+ buflen -= len;
+ } while (buflen > 0);
+
+ return done;
+}
+# endif
+
+# if defined(OPENSSL_RAND_SEED_GETRANDOM)
+
+# if defined(__linux) && !defined(__NR_getrandom)
+# if defined(__arm__)
+# define __NR_getrandom (__NR_SYSCALL_BASE+384)
+# elif defined(__i386__)
+# define __NR_getrandom 355
+# elif defined(__x86_64__)
+# if defined(__ILP32__)
+# define __NR_getrandom (__X32_SYSCALL_BIT + 318)
+# else
+# define __NR_getrandom 318
+# endif
+# elif defined(__xtensa__)
+# define __NR_getrandom 338
+# elif defined(__s390__) || defined(__s390x__)
+# define __NR_getrandom 349
+# elif defined(__bfin__)
+# define __NR_getrandom 389
+# elif defined(__powerpc__)
+# define __NR_getrandom 359
+# elif defined(__mips__) || defined(__mips64)
+# if _MIPS_SIM == _MIPS_SIM_ABI32
+# define __NR_getrandom (__NR_Linux + 353)
+# elif _MIPS_SIM == _MIPS_SIM_ABI64
+# define __NR_getrandom (__NR_Linux + 313)
+# elif _MIPS_SIM == _MIPS_SIM_NABI32
+# define __NR_getrandom (__NR_Linux + 317)
+# endif
+# elif defined(__hppa__)
+# define __NR_getrandom (__NR_Linux + 339)
+# elif defined(__sparc__)
+# define __NR_getrandom 347
+# elif defined(__ia64__)
+# define __NR_getrandom 1339
+# elif defined(__alpha__)
+# define __NR_getrandom 511
+# elif defined(__sh__)
+# if defined(__SH5__)
+# define __NR_getrandom 373
+# else
+# define __NR_getrandom 384
+# endif
+# elif defined(__avr32__)
+# define __NR_getrandom 317
+# elif defined(__microblaze__)
+# define __NR_getrandom 385
+# elif defined(__m68k__)
+# define __NR_getrandom 352
+# elif defined(__cris__)
+# define __NR_getrandom 356
+# elif defined(__aarch64__)
+# define __NR_getrandom 278
+# else /* generic */
+# define __NR_getrandom 278
+# endif