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b684326e SP |
1 | /* Test suite for GNU tar - SEEK_HOLE detector. |
2 | ||
c6f0ad51 | 3 | Copyright 2015-2024 Free Software Foundation, Inc. |
b684326e SP |
4 | |
5 | This program is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by the | |
7 | Free Software Foundation; either version 3, or (at your option) any later | |
8 | version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, but | |
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | |
13 | Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License along | |
16 | with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | ||
18 | Description: detect whether it is possible to work with SEEK_HOLE on | |
19 | particular operating system and file system. */ | |
20 | ||
21 | #include "config.h" | |
22 | ||
23 | #include <sys/stat.h> | |
24 | #include <sys/types.h> | |
25 | #include <unistd.h> | |
26 | #include <stdlib.h> | |
27 | #include <fcntl.h> | |
28 | ||
29 | enum { | |
30 | EX_OK = 0, /* SEEK_HOLE support */ | |
31 | EX_FAIL, /* test failed - no SEEK_HOLE support */ | |
32 | EX_BAD, /* test is not relevant */ | |
33 | }; | |
34 | ||
35 | int | |
36 | check_seek_hole (int fd) | |
37 | { | |
38 | #ifdef SEEK_HOLE | |
39 | struct stat stat; | |
40 | off_t offset; | |
41 | ||
42 | /* hole of 100MB */ | |
43 | if (lseek (fd, 100*1024*1024, SEEK_END) < 0) | |
44 | return EX_BAD; | |
45 | ||
46 | /* piece of data */ | |
47 | if (write (fd, "data\n", 5) != 5) | |
48 | return EX_BAD; | |
49 | ||
50 | /* another hole */ | |
51 | if (lseek (fd, 100*1024*1024, SEEK_END) < 0) | |
52 | return EX_BAD; | |
53 | ||
54 | /* piece of data */ | |
55 | if (write (fd, "data\n", 5) != 5) | |
56 | return EX_BAD; | |
57 | ||
58 | if (fstat (fd, &stat)) | |
59 | return EX_BAD; | |
60 | ||
61 | offset = lseek (fd, 0, SEEK_DATA); | |
62 | if (offset == (off_t)-1) | |
63 | return EX_FAIL; | |
64 | ||
65 | offset = lseek (fd, offset, SEEK_HOLE); | |
66 | if (offset == (off_t)-1 || offset == stat.st_size) | |
67 | return EX_FAIL; | |
68 | ||
69 | return EX_OK; | |
70 | #else | |
71 | return EX_BAD; | |
72 | #endif | |
73 | } | |
74 | ||
75 | int | |
76 | main () | |
77 | { | |
78 | #ifdef SEEK_HOLE | |
79 | int rc; | |
80 | char template[] = "testseekhole-XXXXXX"; | |
81 | int fd = mkstemp (template); | |
82 | if (fd == -1) | |
83 | return EX_BAD; | |
84 | rc = check_seek_hole (fd); | |
85 | close (fd); | |
86 | unlink (template); | |
87 | ||
88 | return rc; | |
89 | #else | |
90 | return EX_FAIL; | |
91 | #endif | |
92 | } |