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/* Copyright (C) 2007-2021 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<https://www.gnu.org/licenses/>. */ | |
#include <sysdep.h> | |
#include <sys/mman.h> | |
int | |
posix_madvise (void *addr, size_t len, int advice) | |
{ | |
/* We have one problem: the kernel's MADV_DONTNEED does not | |
correspond to POSIX's POSIX_MADV_DONTNEED. The former simply | |
discards changes made to the memory without writing it back to | |
disk, if this would be necessary. The POSIX behavior does not | |
allow this. There is no functionality mapping the POSIX behavior | |
so far so we ignore that advice for now. */ | |
if (advice == POSIX_MADV_DONTNEED) | |
return 0; | |
int result = INTERNAL_SYSCALL_CALL (madvise, addr, len, advice); | |
return INTERNAL_SYSCALL_ERRNO (result); | |
} |