solaris: make 'v test-compiler' pass (stage 2)

vlib/crypto/rand/rand_solaris.v

@@ -0,0 +1,45 @@
+// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
+module rand
+
+import math
+
+#include <sys/random.h>
+
+fn C.getrandom(p byteptr, n size_t, flags u32) int
+
+const (
+	read_batch_size = 256
+)
+
+pub fn read(bytes_needed int) ?[]byte {	
+	mut buffer := &byte(0)
+	unsafe {
+	   buffer = malloc(bytes_needed)
+	}
+	mut bytes_read := 0
+	// getrandom syscall wont block if requesting <= 256 bytes
+	if bytes_needed > read_batch_size {
+		no_batches := int(math.floor(f64(bytes_needed/read_batch_size)))
+		for i:=0; i<no_batches; i++ {
+			if v_getrandom(read_batch_size, buffer+bytes_read) == -1 {
+				return read_error
+			}
+			bytes_read += read_batch_size
+		}
+	}
+	if v_getrandom(bytes_needed-bytes_read, buffer+bytes_read) == -1 {
+		return read_error
+	}
+	
+	return c_array_to_bytes_tmp(bytes_needed, buffer)
+}
+
+fn v_getrandom(bytes_needed int, buffer voidptr) int {
+	if bytes_needed > read_batch_size {
+		panic('getrandom() dont request more than $read_batch_size bytes at once.')
+	}
+	return C.getrandom(buffer, bytes_needed, 0)
+}