1 /* Close a range of file descriptors.
2 Copyright (C) 2021-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <errno.h>
20 #include <not-cancel.h>
21 #include <unistd.h>
22
23 /* Close the file descriptors from FIRST up to LAST, inclusive. */
24 int
__close_range(unsigned int first,unsigned int last,int flags)25 __close_range (unsigned int first, unsigned int last,
26 int flags)
27 {
28 if (first > last || flags != 0)
29 {
30 __set_errno (EINVAL);
31 return -1;
32 }
33
34 int maxfd = __getdtablesize ();
35 if (maxfd == -1)
36 return -1;
37
38 for (int i = first; i <= last && i < maxfd; i++)
39 __close_nocancel_nostatus (i);
40
41 return 0;
42 }
43 libc_hidden_def (__close_range)
44 weak_alias (__close_range, close_range)
45