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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/calls/madvise-nt.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program 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 │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/macros.h"
#include "libc/nt/memory.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/memoryrangeentry.h"
#include "libc/sysv/consts/madv.h"
#include "libc/sysv/errfuns.h"
forceinline typeof(PrefetchVirtualMemory) *GetPrefetchVirtualMemory(void) {
static bool once;
static typeof(PrefetchVirtualMemory) *PrefetchVirtualMemory_;
if (!once) {
once = true;
PrefetchVirtualMemory_ = /* win8.1+ */
getprocaddressmodule("KernelBase.dll", "PrefetchVirtualMemory");
}
return PrefetchVirtualMemory_;
}
forceinline typeof(OfferVirtualMemory) *GetOfferVirtualMemory(void) {
static bool once;
static typeof(OfferVirtualMemory) *OfferVirtualMemory_;
if (!once) {
once = true;
OfferVirtualMemory_ = /* win8.1+ */
getprocaddressmodule("KernelBase.dll", "OfferVirtualMemory");
}
return OfferVirtualMemory_;
}
textwindows int madvise$nt(void *addr, size_t length, int advice) {
uint32_t rangecount;
struct NtMemoryRangeEntry ranges[1];
if ((advice & (int)MADV_WILLNEED) == (int)MADV_WILLNEED ||
(advice & (int)MADV_SEQUENTIAL) == (int)MADV_SEQUENTIAL) {
typeof(PrefetchVirtualMemory) *fn = GetPrefetchVirtualMemory();
if (fn) {
ranges[0].VirtualAddress = addr;
ranges[0].NumberOfBytes = length;
rangecount = ARRAYLEN(ranges);
if (fn(GetCurrentProcess(), &rangecount, ranges, 0)) {
return 0;
} else {
return winerr();
}
} else {
return enosys();
}
} else if ((advice & (int)MADV_FREE) == (int)MADV_FREE) {
typeof(OfferVirtualMemory) *fn = GetOfferVirtualMemory();
if (fn) {
if (fn(addr, length, kNtVmOfferPriorityNormal)) {
return 0;
} else {
return winerr();
}
} else {
return enosys();
}
} else {
return einval();
}
}