1/*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source.  A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12/*
13 * Copyright (c) 2015, Joyent, Inc.
14 */
15
16/*
17 * Test getentropy(3C)
18 */
19
20#include <unistd.h>
21#include <sys/mman.h>
22#include <assert.h>
23#include <errno.h>
24
25int
26main(void)
27{
28	int ret;
29	void *addr;
30	uint8_t errbuf[512];
31	uint8_t buf[128];
32
33	ret = getentropy(buf, sizeof (buf));
34	assert(ret == 0);
35
36	/* Max buffer is 256 bytes, verify if we go larger, we error */
37	ret = getentropy(errbuf, sizeof (errbuf));
38	assert(ret == -1);
39	assert(errno == EIO);
40
41	ret = getentropy(errbuf, 257);
42	assert(ret == -1);
43	assert(errno == EIO);
44
45	ret = getentropy(errbuf, 256);
46	assert(ret == 0);
47
48	ret = getentropy(errbuf, 0);
49	assert(ret == 0);
50
51	/* Bad buffers */
52	ret = getentropy(NULL, sizeof (buf));
53	assert(ret == -1);
54	assert(errno == EFAULT);
55
56	/* Jump through a hoop to know we'll always have a bad address */
57	addr = mmap(NULL, 4096, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0);
58	assert(addr != MAP_FAILED);
59	ret = munmap(addr, 4096);
60	assert(ret == 0);
61	ret = getentropy(addr, sizeof (buf));
62	assert(ret == -1);
63	assert(errno == EFAULT);
64
65	return (0);
66}
67