1/*	$OpenBSD: pwritev.c,v 1.5 2011/11/06 15:00:34 guenther Exp $	*/
2/*
3 *	Written by Artur Grabowski <art@openbsd.org> 2002 Public Domain.
4 */
5#include <sys/types.h>
6#include <sys/uio.h>
7#include <err.h>
8#include <errno.h>
9#include <fcntl.h>
10#include <limits.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
14#include <unistd.h>
15
16int
17main(int argc, char *argv[])
18{
19	char temp[] = "/tmp/pwritevXXXXXXXXX";
20	char magic[10] = "0123456789";
21	const char zeroes[10] = "0000000000";
22	char buf[10];
23	struct iovec iov[2];
24	char c;
25	int fd, ret;
26
27	if ((fd = mkstemp(temp)) < 0)
28		err(1, "mkstemp");
29	remove(temp);
30
31	if (write(fd, zeroes, sizeof(zeroes)) != sizeof(zeroes))
32		err(1, "write");
33
34	if (lseek(fd, 5, SEEK_SET) != 5)
35		err(1, "lseek");
36
37	iov[0].iov_base = &magic[8];
38	iov[0].iov_len = 2;
39	iov[1].iov_base = &magic[7];
40	iov[1].iov_len = 2;
41
42	if (pwritev(fd, iov, 2, 4) != 4)
43		err(1, "pwritev");
44
45	if (read(fd, &c, 1) != 1)
46		err(1, "read");
47
48	if (c != '9')
49		errx(1, "read %c != %c", c, '9');
50
51	c = '5';
52	if (write(fd, &c, 1) != 1)
53		err(1, "write");
54
55	if (pread(fd, buf, 10, 0) != 10)
56		err(1, "pread");
57
58	iov[1].iov_base = &magic[1];
59	iov[1].iov_len = 2;
60	if ((ret = pwritev(fd, iov, 2, -1)) != -1)
61		errx(1, "pwritev with negative offset succeeded,\
62				returning %d", ret);
63	if (errno != EINVAL)
64		err(1, "pwritev with negative offset");
65
66	if ((ret = pwritev(fd, iov, 2, LLONG_MAX)) != -1)
67		errx(1, "pwritev with wrapping offset succeeded,\
68				returning %d", ret);
69	if (errno != EFBIG && errno != EINVAL)
70		err(1, "pwritev with wrapping offset");
71
72	if (memcmp(buf, "0000895800", 10) != 0)
73		errx(1, "data mismatch: %s != %s", buf, "0000895800");
74
75	/* pwrite should be unaffected by O_APPEND */
76	if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_APPEND))
77		err(1, "fcntl");
78	if (pwritev(fd, iov, 2, 2) != 4)
79		err(1, "pwritev");
80	if (pread(fd, buf, 10, 0) != 10)
81		err(1, "pread");
82	if (memcmp(buf, "0089125800", 10) != 0)
83		errx(1, "data mismatch: %s != %s", buf, "0089125800");
84
85	close(fd);
86
87	/* also, verify that pwritev fails on ttys */
88	fd = open("/dev/tty", O_RDWR);
89	if (fd < 0)
90		printf("skipping tty test\n");
91	else if ((ret = pwritev(fd, iov, 2, 7)) != -1)
92		errx(1, "pwritev succeeded on tty, returning %d", ret);
93	else if (errno != ESPIPE)
94		err(1, "pwritev");
95
96	return 0;
97}
98