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b168057a | 1 | /* Copyright (C) 2007-2015 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
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15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
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17 | |
18 | #include <sysdep.h> | |
19 | #include <sys/mman.h> | |
20 | ||
21 | ||
22 | int | |
cdfd61e1 | 23 | posix_madvise (void *addr, size_t len, int advice) |
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24 | { |
25 | /* We have one problem: the kernel's MADV_DONTNEED does not | |
26 | correspond to POSIX's POSIX_MADV_DONTNEED. The former simply | |
27 | discards changes made to the memory without writing it back to | |
28 | disk, if this would be necessary. The POSIX behavior does not | |
29 | allow this. There is no functionality mapping the POSIX behavior | |
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30 | so far so we ignore that advice for now. */ |
31 | if (advice == POSIX_MADV_DONTNEED) | |
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32 | return 0; |
33 | ||
34 | INTERNAL_SYSCALL_DECL (err); | |
cdfd61e1 | 35 | int result = INTERNAL_SYSCALL (madvise, err, 3, addr, len, advice); |
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36 | return INTERNAL_SYSCALL_ERRNO (result, err); |
37 | } |