1 /* $OpenBSD: pwrite.c,v 1.6 2014/02/28 16:14:05 espie Exp $ */
2 /*
3 * Written by Artur Grabowski <art@openbsd.org> 2002 Public Domain.
4 */
5 #include <err.h>
6 #include <errno.h>
7 #include <fcntl.h>
8 #include <limits.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <unistd.h>
13
14 int
main(int argc,char * argv[])15 main(int argc, char *argv[])
16 {
17 char temp[] = "/tmp/pwriteXXXXXXXXX";
18 const char magic[10] = "0123456789";
19 const char zeroes[10] = "0000000000";
20 char buf[10];
21 char c;
22 int fd, ret;
23
24 if ((fd = mkstemp(temp)) < 0)
25 err(1, "mkstemp");
26 remove(temp);
27
28 if (write(fd, zeroes, sizeof(zeroes)) != sizeof(zeroes))
29 err(1, "write");
30
31 if (lseek(fd, 5, SEEK_SET) != 5)
32 err(1, "lseek");
33
34 if (pwrite(fd, &magic[1], 4, 4) != 4)
35 err(1, "pwrite");
36
37 if (read(fd, &c, 1) != 1)
38 err(1, "read");
39
40 if (c != '2')
41 errx(1, "read %c != %c", c, '2');
42
43 c = '5';
44 if (write(fd, &c, 1) != 1)
45 err(1, "write");
46
47 if (write(fd, &c, 0) != 0)
48 err(1, "write");
49
50 if (pread(fd, buf, 10, 0) != 10)
51 err(1, "pread");
52
53 if (memcmp(buf, "0000125400", 10) != 0)
54 errx(1, "data mismatch: %s != %s", buf, "0000125400");
55
56 if ((ret = pwrite(fd, &magic[5], 1, -1)) != -1)
57 errx(1, "pwrite with negative offset succeeded,\
58 returning %d", ret);
59 if (errno != EINVAL)
60 err(1, "pwrite with negative offset");
61
62 if ((ret = pwrite(fd, &magic[5], 1, LLONG_MAX)) != -1)
63 errx(1, "pwrite with wrapping offset succeeded,\
64 returning %d", ret);
65 if (errno != EFBIG && errno != EINVAL)
66 err(1, "pwrite with wrapping offset");
67
68 /* pwrite should be unaffected by O_APPEND */
69 if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_APPEND))
70 err(1, "fcntl");
71 if (pwrite(fd, &magic[2], 3, 2) != 3)
72 err(1, "pwrite");
73 if (pread(fd, buf, 10, 0) != 10)
74 err(1, "pread");
75 if (memcmp(buf, "0023425400", 10) != 0)
76 errx(1, "data mismatch: %s != %s", buf, "0023425400");
77
78 close(fd);
79
80 /* also, verify that pwrite fails on ttys */
81 fd = open("/dev/tty", O_RDWR);
82 if (fd < 0)
83 printf("skipping tty test\n");
84 else if ((ret = pwrite(fd, &c, 1, 7)) != -1)
85 errx(1, "pwrite succeeded on tty, returning %d", ret);
86 else if (errno != ESPIPE)
87 err(1, "pwrite");
88
89 return 0;
90 }
91