| 1 | /* Error-checking wrapper for sysconf. |
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| 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <support/check.h> |
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| 21 | #include <support/xunistd.h> |
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| 22 | |
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| 23 | long |
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| 24 | xsysconf (int name) |
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| 25 | { |
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| 26 | /* Detect errors by a changed errno value, in case -1 is a valid |
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| 27 | value. Make sure that the caller does not see the zero value for |
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| 28 | errno. */ |
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| 29 | int old_errno = errno; |
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| 30 | errno = 0; |
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| 31 | long result = sysconf (name: name); |
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| 32 | if (result == -1 && errno != 0) |
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| 33 | FAIL_EXIT1 ("sysconf (%d): %m" , name); |
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| 34 | errno = old_errno; |
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| 35 | return result; |
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| 36 | } |
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| 37 | |
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