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/* vi: set sw=4 ts=4: */
/* Licensed under the LGPL v2.1, see the file LICENSE in this tarball. */
#include <sys/mman.h>
#include <sys/syscall.h>
#if defined __NR_madvise && defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
int posix_madvise(void *addr, size_t len, int advice)
{
int result;
/* 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 behaviour does not
* allow this. There is no functionality mapping for the POSIX
* behaviour so far so we ignore that advice for now. */
if (advice == POSIX_MADV_DONTNEED)
return 0;
/* this part might use madvise function */
INTERNAL_SYSCALL_DECL (err);
result = INTERNAL_SYSCALL (madvise, err, 3, addr, len, advice);
return INTERNAL_SYSCALL_ERRNO (result, err);
}
#endif
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