1 | /* Verify that print functions return error when there is an I/O error. |
2 | |
3 | Copyright (C) 2005-2022 Free Software Foundation, Inc. |
4 | This file is part of the GNU C Library. |
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 |
17 | License along with the GNU C Library; if not, see |
18 | <https://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <errno.h> |
21 | #include <error.h> |
22 | #include <stdio.h> |
23 | #include <stdlib.h> |
24 | #include <unistd.h> |
25 | |
26 | |
27 | static int |
28 | do_test (void) |
29 | { |
30 | char tmpl[] = "/tmp/tst-put-error.XXXXXX" ; |
31 | int fd = mkstemp (template: tmpl); |
32 | if (fd == -1) |
33 | error (EXIT_FAILURE, errno, format: "cannot create temporary file" ); |
34 | FILE *fp = fdopen (fd, "w" ); |
35 | if (fp == NULL) |
36 | error (EXIT_FAILURE, errno, format: "fdopen" ); |
37 | |
38 | /* All of the tests below verify that flushing buffers result in failure of |
39 | the fprintf calls. We ensure that the buffer is flushed at the end of |
40 | each fprintf call by doing two things - setting the file pointer to |
41 | line-buffered so that it is flushed whenever it encounters a newline and |
42 | then ensuring that there is a newline in each of the format strings we |
43 | pass to fprintf. */ |
44 | |
45 | setlinebuf (fp); |
46 | close (fd: fd); |
47 | unlink (name: tmpl); |
48 | |
49 | int n = fprintf (fp, "hello world\n" ); |
50 | printf (format: "fprintf = %d\n" , n); |
51 | if (n >= 0) |
52 | error (EXIT_FAILURE, errnum: 0, format: "first fprintf succeeded" ); |
53 | |
54 | n = fprintf (fp, "hello world\n" ); |
55 | printf (format: "fprintf = %d\n" , n); |
56 | if (n >= 0) |
57 | error (EXIT_FAILURE, errnum: 0, format: "second fprintf succeeded" ); |
58 | |
59 | /* Padded printing takes a different code path. */ |
60 | n = fprintf (fp, "%100s\n" , "foo" ); |
61 | printf (format: "fprintf = %d\n" , n); |
62 | if (n >= 0) |
63 | error (EXIT_FAILURE, errnum: 0, format: "padded fprintf succeeded" ); |
64 | |
65 | return 0; |
66 | } |
67 | |
68 | #define TEST_FUNCTION do_test () |
69 | #include "../test-skeleton.c" |
70 | |