1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/* $OpenBSD: preadv.c,v 1.4 2011/11/06 15:00:34 guenther Exp $ */
/*
* Written by Artur Grabowski <art@openbsd.org> 2002 Public Domain.
*/
#include <sys/types.h>
#include <sys/uio.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
char temp[] = "/tmp/dup2XXXXXXXXX";
const char magic[10] = "0123456789";
char c, c1, c2;
int fd, ret;
struct iovec iv[2];
if ((fd = mkstemp(temp)) < 0)
err(1, "mkstemp");
remove(temp);
if (write(fd, magic, sizeof(magic)) != sizeof(magic))
err(1, "write");
if (lseek(fd, 0, SEEK_SET) != 0)
err(1, "lseek");
if (read(fd, &c, 1) != 1)
err(1, "read1");
if (c != magic[0])
errx(1, "read1 %c != %c", c, magic[0]);
iv[0].iov_base = &c1;
iv[0].iov_len = 1;
iv[1].iov_base = &c2;
iv[1].iov_len = 1;
if (preadv(fd, iv, 2, 7) != 2)
err(1, "preadv");
if (c1 != magic[7])
errx(1, "preadv %c != %c", c1, magic[7]);
if (c2 != magic[8])
errx(1, "preadv %c != %c", c2, magic[7]);
if (read(fd, &c, 1) != 1)
err(1, "read2");
if (c != magic[1])
errx(1, "read2 %c != %c", c, magic[1]);
if ((ret = preadv(fd, iv, 2, -1)) != -1)
errx(1, "preadv with negative offset succeeded,\
returning %d", ret);
if (errno != EINVAL)
err(1, "pread with negative offset");
if ((ret = preadv(fd, iv, 2, LLONG_MAX)) != -1)
errx(1, "preadv with wrapping offset succeeded,\
returning %d", ret);
if (errno != EINVAL)
err(1, "pread with wrapping offset");
if (read(fd, &c, 1) != 1)
err(1, "read3");
if (c != magic[2])
errx(1, "read3 %c != %c", c, magic[2]);
close(fd);
/* also, verify that preadv fails on ttys */
fd = open("/dev/tty", O_RDWR);
if (fd < 0)
printf("skipping tty test\n");
else if ((ret = preadv(fd, iv, 2, 7)) != -1)
errx(1, "preadv succeeded on tty, returning %d", ret);
else if (errno != ESPIPE)
err(1, "preadv");
return 0;
}
|
