| 1 | /* Regression test for reported old bug that errno is clobbered |
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| 2 | by the first successful output to a stream on an unseekable object. |
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| 3 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, see |
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| 18 | <https://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #include <errno.h> |
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| 21 | #include <stdio.h> |
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| 22 | #include <unistd.h> |
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| 23 | |
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| 24 | int |
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| 25 | main (void) |
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| 26 | { |
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| 27 | int fd[2]; |
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| 28 | FILE *f; |
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| 29 | |
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| 30 | /* Get a stream that cannot seek. */ |
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| 31 | |
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| 32 | if (pipe (pipedes: fd)) |
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| 33 | { |
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| 34 | perror ("pipe" ); |
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| 35 | return 1; |
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| 36 | } |
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| 37 | f = fdopen (fd[1], "w" ); |
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| 38 | if (f == NULL) |
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| 39 | { |
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| 40 | perror ("fdopen" ); |
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| 41 | return 1; |
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| 42 | } |
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| 43 | |
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| 44 | errno = 0; |
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| 45 | if (fputs ("fnord" , f) == EOF) |
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| 46 | { |
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| 47 | perror ("fputs" ); |
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| 48 | return 1; |
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| 49 | } |
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| 50 | |
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| 51 | if (errno) |
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| 52 | { |
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| 53 | perror ("errno gratuitously set -- TEST FAILED" ); |
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| 54 | return 1; |
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| 55 | } |
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| 56 | |
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| 57 | puts (s: "Test succeeded." ); |
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| 58 | return 0; |
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| 59 | } |
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| 60 | |
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