| 1 | /* Close a range of file descriptors. |
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| 2 | Copyright (C) 2021-2022 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 <not-cancel.h> |
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| 21 | #include <unistd.h> |
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| 22 | |
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| 23 | /* Close the file descriptors from FIRST up to LAST, inclusive. */ |
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| 24 | int |
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| 25 | __close_range (unsigned int first, unsigned int last, |
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| 26 | int flags) |
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| 27 | { |
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| 28 | if (first > last || flags != 0) |
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| 29 | { |
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| 30 | __set_errno (EINVAL); |
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| 31 | return -1; |
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| 32 | } |
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| 33 | |
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| 34 | int maxfd = __getdtablesize (); |
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| 35 | if (maxfd == -1) |
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| 36 | return -1; |
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| 37 | |
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| 38 | for (int i = first; i <= last && i < maxfd; i++) |
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| 39 | __close_nocancel_nostatus (fd: i); |
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| 40 | |
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| 41 | return 0; |
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| 42 | } |
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| 43 | libc_hidden_def (__close_range) |
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| 44 | weak_alias (__close_range, close_range) |
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| 45 | |
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