mirror of
https://github.com/jart/cosmopolitan.git
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87 lines
4.3 KiB
C
87 lines
4.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/enum/filemapflags.h"
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#include "libc/nt/enum/pageflags.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/overlapped.h"
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#include "libc/runtime/directmap.internal.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/prot.h"
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textwindows noasan struct DirectMap sys_mmap_nt(void *addr, size_t size,
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int prot, int flags,
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int64_t handle, int64_t off) {
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uint32_t got;
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size_t i, upsize;
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struct DirectMap dm;
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struct NtOverlapped op;
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if ((prot & PROT_WRITE) && (flags & MAP_PRIVATE) && handle != -1) {
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/*
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* WIN32 claims it can do COW mappings but we still haven't found a
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* combination of flags, that'll cause Windows to actually do this!
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*/
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upsize = ROUNDUP(size, FRAMESIZE);
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if ((dm.maphandle = CreateFileMappingNuma(
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-1, &kNtIsInheritable, kNtPageExecuteReadwrite, upsize >> 32,
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upsize, NULL, kNtNumaNoPreferredNode))) {
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if ((dm.addr = MapViewOfFileExNuma(
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dm.maphandle, kNtFileMapWrite | kNtFileMapExecute, 0, 0, upsize,
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addr, kNtNumaNoPreferredNode))) {
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for (i = 0; i < size; i += got) {
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got = 0;
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op.Internal = 0;
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op.InternalHigh = 0;
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op.Pointer = (void *)(uintptr_t)i;
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op.hEvent = 0;
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if (!ReadFile(handle, (char *)dm.addr + i, size - i, &got, &op)) {
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break;
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}
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}
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if (i == size) {
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return dm;
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}
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UnmapViewOfFile(dm.addr);
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}
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CloseHandle(dm.maphandle);
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}
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} else {
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if ((dm.maphandle = CreateFileMappingNuma(
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handle, &kNtIsInheritable,
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(prot & PROT_WRITE) ? kNtPageExecuteReadwrite : kNtPageExecuteRead,
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handle != -1 ? 0 : size >> 32, handle != -1 ? 0 : size, NULL,
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kNtNumaNoPreferredNode))) {
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if ((dm.addr = MapViewOfFileExNuma(
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dm.maphandle,
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(prot & PROT_WRITE) ? kNtFileMapWrite | kNtFileMapExecute
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: kNtFileMapRead | kNtFileMapExecute,
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off >> 32, off, size, addr, kNtNumaNoPreferredNode))) {
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return dm;
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} else {
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CloseHandle(dm.maphandle);
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}
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}
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}
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dm.maphandle = kNtInvalidHandleValue;
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dm.addr = (void *)(intptr_t)__winerr();
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return dm;
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}
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