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bff334e0 | 1 | /* Test setvbuf on readonly fopen (using mmap stdio). |
688903eb | 2 | Copyright (C) 2002-2018 Free Software Foundation, Inc. |
bff334e0 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Jakub Jelinek <jakub@redhat.com>, 2002. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
bff334e0 UD |
19 | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <unistd.h> | |
24 | ||
25 | int main (void) | |
26 | { | |
27 | char name[] = "/tmp/tst-mmap-setvbuf.XXXXXX"; | |
28 | char buf[4096]; | |
29 | const char * const test = "Let's see if mmap stdio works with setvbuf.\n"; | |
30 | char temp[strlen (test) + 1]; | |
31 | int fd = mkstemp (name); | |
32 | FILE *f; | |
33 | ||
34 | if (fd == -1) | |
35 | { | |
6d497bbe | 36 | printf ("%u: cannot open temporary file: %m\n", __LINE__); |
bff334e0 UD |
37 | exit (1); |
38 | } | |
39 | ||
40 | f = fdopen (fd, "w"); | |
41 | if (f == NULL) | |
42 | { | |
6d497bbe | 43 | printf ("%u: cannot fdopen temporary file: %m\n", __LINE__); |
bff334e0 UD |
44 | exit (1); |
45 | } | |
46 | ||
47 | fputs (test, f); | |
48 | fclose (f); | |
49 | ||
1ce8aaae | 50 | f = fopen (name, "rm"); |
bff334e0 UD |
51 | if (f == NULL) |
52 | { | |
6d497bbe | 53 | printf ("%u: cannot fopen temporary file: %m\n", __LINE__); |
bff334e0 UD |
54 | exit (1); |
55 | } | |
56 | ||
57 | if (setvbuf (f, buf, _IOFBF, sizeof buf)) | |
58 | { | |
6d497bbe | 59 | printf ("%u: setvbuf failed: %m\n", __LINE__); |
bff334e0 UD |
60 | exit (1); |
61 | } | |
62 | ||
63 | if (fread (temp, 1, strlen (test), f) != strlen (test)) | |
64 | { | |
6d497bbe | 65 | printf ("%u: couldn't read the file back: %m\n", __LINE__); |
bff334e0 UD |
66 | exit (1); |
67 | } | |
68 | temp [strlen (test)] = '\0'; | |
69 | ||
70 | if (strcmp (test, temp)) | |
71 | { | |
6d497bbe | 72 | printf ("%u: read different string than was written:\n%s%s", |
bff334e0 UD |
73 | __LINE__, test, temp); |
74 | exit (1); | |
75 | } | |
76 | ||
77 | fclose (f); | |
78 | ||
79 | unlink (name); | |
80 | exit (0); | |
81 | } |