| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Verify that print functions return error when there is an I/O error. |
| 2 | |
| 3 | Copyright (C) 2005-2016 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 | <http://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 (tmpl); |
| 32 | if (fd == -1) |
| 33 | error (EXIT_FAILURE, errno, "cannot create temporary file"); |
| 34 | FILE *fp = fdopen (fd, "w"); |
| 35 | if (fp == NULL) |
| 36 | error (EXIT_FAILURE, errno, "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); |
| 47 | unlink (tmpl); |
| 48 | |
| 49 | int n = fprintf (fp, "hello world\n"); |
| 50 | printf ("fprintf = %d\n", n); |
| 51 | if (n >= 0) |
| 52 | error (EXIT_FAILURE, 0, "first fprintf succeeded"); |
| 53 | |
| 54 | n = fprintf (fp, "hello world\n"); |
| 55 | printf ("fprintf = %d\n", n); |
| 56 | if (n >= 0) |
| 57 | error (EXIT_FAILURE, 0, "second fprintf succeeded"); |
| 58 | |
| 59 | /* Padded printing takes a different code path. */ |
| 60 | n = fprintf (fp, "%100s\n", "foo"); |
| 61 | printf ("fprintf = %d\n", n); |
| 62 | if (n >= 0) |
| 63 | error (EXIT_FAILURE, 0, "padded fprintf succeeded"); |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | #define TEST_FUNCTION do_test () |
| 69 | #include "../test-skeleton.c" |