mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
29bf8b1a30
- Make rand64() thread safe - Introduce lemur64 lcg prng - Improve strace on New Technology - Improve msync() on New Technology
66 lines
3.4 KiB
C
66 lines
3.4 KiB
C
/*-*- 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/nt/enum/filemapflags.h"
|
|
#include "libc/nt/enum/pageflags.h"
|
|
#include "libc/nt/memory.h"
|
|
#include "libc/nt/runtime.h"
|
|
#include "libc/runtime/directmap.internal.h"
|
|
#include "libc/sysv/consts/map.h"
|
|
#include "libc/sysv/consts/prot.h"
|
|
|
|
textwindows noasan struct DirectMap sys_mmap_nt(void *addr, size_t size,
|
|
int prot, int flags,
|
|
int64_t handle, int64_t off) {
|
|
size_t i;
|
|
struct DirectMap dm;
|
|
struct ProtectNt fl;
|
|
const struct NtSecurityAttributes *sec;
|
|
|
|
if (flags & MAP_PRIVATE) {
|
|
sec = 0; // MAP_PRIVATE isn't inherited across fork()
|
|
} else {
|
|
sec = &kNtIsInheritable; // MAP_SHARED gives us zero-copy fork()
|
|
}
|
|
|
|
if ((prot & PROT_WRITE) && (flags & MAP_PRIVATE) && handle != -1) {
|
|
// windows has cow pages but they can't propagate across fork()
|
|
if (prot & PROT_EXEC) {
|
|
fl = (struct ProtectNt){kNtPageExecuteWritecopy,
|
|
kNtFileMapCopy | kNtFileMapExecute};
|
|
} else {
|
|
fl = (struct ProtectNt){kNtPageWritecopy, kNtFileMapCopy};
|
|
}
|
|
} else {
|
|
fl = __nt2prot(prot);
|
|
}
|
|
|
|
if ((dm.maphandle = CreateFileMapping(handle, sec, fl.flags1,
|
|
(size + off) >> 32, (size + off), 0))) {
|
|
if ((dm.addr = MapViewOfFileEx(dm.maphandle, fl.flags2, off >> 32, off,
|
|
size, addr))) {
|
|
return dm;
|
|
}
|
|
CloseHandle(dm.maphandle);
|
|
}
|
|
|
|
dm.maphandle = kNtInvalidHandleValue;
|
|
dm.addr = (void *)(intptr_t)-1;
|
|
return dm;
|
|
}
|