1/*
2 * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "tests.h"
29
30#ifdef HAVE_PWRITEV
31
32# include <fcntl.h>
33# include <stdio.h>
34# include <sys/uio.h>
35# include <unistd.h>
36
37# define LEN 8
38# define LIM (LEN - 1)
39
40static void
41print_iov(const struct iovec *iov)
42{
43	unsigned int i;
44	unsigned char *buf = iov->iov_base;
45
46	fputs("{iov_base=\"", stdout);
47	for (i = 0; i < iov->iov_len; ++i) {
48		if (i < LIM)
49			printf("\\%d", (int) buf[i]);
50	}
51	printf("\"%s, iov_len=%u}",
52	       i > LIM ? "..." : "", (unsigned) iov->iov_len);
53}
54
55static void
56print_iovec(const struct iovec *iov, unsigned int cnt, unsigned int size)
57{
58	if (!size) {
59		printf("%p", iov);
60		return;
61	}
62	unsigned int i;
63	putchar('[');
64	for (i = 0; i < cnt; ++i) {
65		if (i)
66			fputs(", ", stdout);
67		if (i == size) {
68			printf("%p", &iov[i]);
69			break;
70		}
71		if (i == LIM) {
72			fputs("...", stdout);
73			break;
74		}
75		print_iov(&iov[i]);
76	}
77	putchar(']');
78}
79
80int
81main(void)
82{
83	(void) close(0);
84	if (open("/dev/null", O_WRONLY))
85		perror_msg_and_fail("open");
86
87	char *buf = tail_alloc(LEN);
88	unsigned i;
89	for (i = 0; i < LEN; ++i)
90		buf[i] = i;
91
92	struct iovec *iov = tail_alloc(sizeof(*iov) * LEN);
93	for (i = 0; i < LEN; ++i) {
94		buf[i] = i;
95		iov[i].iov_base = &buf[i];
96		iov[i].iov_len = LEN - i;
97	}
98
99	const off_t offset = 0xdefaceddeadbeefLL;
100	long rc;
101	int written = 0;
102	for (i = 0; i < LEN; ++i) {
103		written += iov[i].iov_len;
104		if (pwritev(0, iov, i + 1, offset + i) != written)
105			perror_msg_and_fail("pwritev");
106		fputs("pwritev(0, ", stdout);
107		print_iovec(iov, i + 1, LEN);
108		printf(", %u, %lld) = %d\n",
109		       i + 1, (long long) offset + i, written);
110	}
111
112	for (i = 0; i <= LEN; ++i) {
113		unsigned int n = LEN + 1 - i;
114		fputs("pwritev(0, ", stdout);
115		print_iovec(iov + i, n, LEN - i);
116		rc = pwritev(0, iov + i, n, offset + LEN + i);
117		printf(", %u, %lld) = %ld %s (%m)\n",
118		       n, (long long) offset + LEN + i, rc, errno2name());
119	}
120
121	iov->iov_base = iov + LEN * 2;
122	rc = pwritev(0, iov, 1, -1);
123	printf("pwritev(0, [{iov_base=%p, iov_len=%d}], 1, -1) = %ld %s (%m)\n",
124	       iov->iov_base, LEN, rc, errno2name());
125
126	iov += LEN;
127	rc = pwritev(0, iov, 42, -2);
128	printf("pwritev(0, %p, 42, -2) = %ld %s (%m)\n",
129	       iov, rc, errno2name());
130
131	rc = pwritev(0, NULL, 1, -3);
132	printf("pwritev(0, NULL, 1, -3) = %ld %s (%m)\n",
133	       rc, errno2name());
134
135	rc = pwritev(0, iov, 0, -4);
136	printf("pwritev(0, [], 0, -4) = %ld %s (%m)\n",
137	       rc, errno2name());
138
139	puts("+++ exited with 0 +++");
140	return 0;
141}
142
143#else
144
145SKIP_MAIN_UNDEFINED("HAVE_PWRITEV")
146
147#endif
148