1 | /* Test setvbuf on readonly fopen (using mmap stdio). |
2 | Copyright (C) 2002-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdio.h> |
20 | #include <stdlib.h> |
21 | #include <string.h> |
22 | #include <unistd.h> |
23 | |
24 | int main (void) |
25 | { |
26 | char name[] = "/tmp/tst-mmap-setvbuf.XXXXXX" ; |
27 | char buf[4096]; |
28 | const char * const test = "Let's see if mmap stdio works with setvbuf.\n" ; |
29 | char temp[strlen (test) + 1]; |
30 | int fd = mkstemp (template: name); |
31 | FILE *f; |
32 | |
33 | if (fd == -1) |
34 | { |
35 | printf (format: "%u: cannot open temporary file: %m\n" , __LINE__); |
36 | exit (1); |
37 | } |
38 | |
39 | f = fdopen (fd, "w" ); |
40 | if (f == NULL) |
41 | { |
42 | printf (format: "%u: cannot fdopen temporary file: %m\n" , __LINE__); |
43 | exit (1); |
44 | } |
45 | |
46 | fputs (test, f); |
47 | fclose (f); |
48 | |
49 | f = fopen (name, "rm" ); |
50 | if (f == NULL) |
51 | { |
52 | printf (format: "%u: cannot fopen temporary file: %m\n" , __LINE__); |
53 | exit (1); |
54 | } |
55 | |
56 | if (setvbuf (stream: f, buf: buf, _IOFBF, n: sizeof buf)) |
57 | { |
58 | printf (format: "%u: setvbuf failed: %m\n" , __LINE__); |
59 | exit (1); |
60 | } |
61 | |
62 | if (fread (ptr: temp, size: 1, n: strlen (test), stream: f) != strlen (test)) |
63 | { |
64 | printf (format: "%u: couldn't read the file back: %m\n" , __LINE__); |
65 | exit (1); |
66 | } |
67 | temp [strlen (test)] = '\0'; |
68 | |
69 | if (strcmp (test, temp)) |
70 | { |
71 | printf (format: "%u: read different string than was written:\n%s%s" , |
72 | __LINE__, test, temp); |
73 | exit (1); |
74 | } |
75 | |
76 | fclose (f); |
77 | |
78 | unlink (name: name); |
79 | exit (0); |
80 | } |
81 | |