1 /* $OpenBSD: preadv.c,v 1.4 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 <unistd.h>
14
15 int
main(int argc,char * argv[])16 main(int argc, char *argv[])
17 {
18 char temp[] = "/tmp/dup2XXXXXXXXX";
19 const char magic[10] = "0123456789";
20 char c, c1, c2;
21 int fd, ret;
22 struct iovec iv[2];
23
24 if ((fd = mkstemp(temp)) < 0)
25 err(1, "mkstemp");
26 remove(temp);
27
28 if (write(fd, magic, sizeof(magic)) != sizeof(magic))
29 err(1, "write");
30
31 if (lseek(fd, 0, SEEK_SET) != 0)
32 err(1, "lseek");
33
34 if (read(fd, &c, 1) != 1)
35 err(1, "read1");
36
37 if (c != magic[0])
38 errx(1, "read1 %c != %c", c, magic[0]);
39
40 iv[0].iov_base = &c1;
41 iv[0].iov_len = 1;
42 iv[1].iov_base = &c2;
43 iv[1].iov_len = 1;
44
45 if (preadv(fd, iv, 2, 7) != 2)
46 err(1, "preadv");
47
48 if (c1 != magic[7])
49 errx(1, "preadv %c != %c", c1, magic[7]);
50
51 if (c2 != magic[8])
52 errx(1, "preadv %c != %c", c2, magic[7]);
53
54 if (read(fd, &c, 1) != 1)
55 err(1, "read2");
56
57 if (c != magic[1])
58 errx(1, "read2 %c != %c", c, magic[1]);
59
60 if ((ret = preadv(fd, iv, 2, -1)) != -1)
61 errx(1, "preadv with negative offset succeeded,\
62 returning %d", ret);
63 if (errno != EINVAL)
64 err(1, "pread with negative offset");
65
66 if ((ret = preadv(fd, iv, 2, LLONG_MAX)) != -1)
67 errx(1, "preadv with wrapping offset succeeded,\
68 returning %d", ret);
69 if (errno != EINVAL)
70 err(1, "pread with wrapping offset");
71
72 if (read(fd, &c, 1) != 1)
73 err(1, "read3");
74
75 if (c != magic[2])
76 errx(1, "read3 %c != %c", c, magic[2]);
77
78 close(fd);
79
80 /* also, verify that preadv fails on ttys */
81 fd = open("/dev/tty", O_RDWR);
82 if (fd < 0)
83 printf("skipping tty test\n");
84 else if ((ret = preadv(fd, iv, 2, 7)) != -1)
85 errx(1, "preadv succeeded on tty, returning %d", ret);
86 else if (errno != ESPIPE)
87 err(1, "preadv");
88
89 return 0;
90 }
91