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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 │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/macros.h"
#include "libc/nt/enum/offerpriority.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();
}
}