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https://github.com/jart/cosmopolitan.git
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0cb6b6ff4b
Now that we have understandable system call tracing on Windows, this change rewrites many of the polyfill internals for that platform, to help things get closer to tip top shape. Support for complex forking scenarios had been in a regressed state for quite some time. Now, it works! Subsequent changes should be able to address the performance.
89 lines
4.3 KiB
C
89 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/calls/strace.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/process.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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/* asan runtime depends on this function */
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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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}
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CloseHandle(dm.maphandle);
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}
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}
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dm.maphandle = kNtInvalidHandleValue;
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dm.addr = (void *)(intptr_t)-1;
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return dm;
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}
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