/*-*- 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/pageflags.h"
#include "libc/nt/memory.h"
#include "libc/nt/runtime.h"
#include "libc/runtime/directmap.h"

textwindows struct DirectMap __mmap$nt(void *addr, size_t size, unsigned prot,
                                       unsigned flags, int fd, int64_t off) {
  int64_t handle;
  struct DirectMap res;
  if (fd != -1) {
    handle = g_fds.p[fd].handle;
  } else {
    handle = kNtInvalidHandleValue;
  }
  if ((res.maphandle = CreateFileMappingNuma(
           handle, NULL, kNtPageExecuteReadwrite, size >> 32, size, NULL,
           kNtNumaNoPreferredNode))) {
    if (!(res.addr = MapViewOfFileExNuma(res.maphandle, fprot2nt(prot, flags),
                                         off >> 32, off, size, addr,
                                         kNtNumaNoPreferredNode))) {
      CloseHandle(res.maphandle);
      res.maphandle = kNtInvalidHandleValue;
      res.addr = (void *)(intptr_t)__winerr();
    }
  } else {
    res.maphandle = kNtInvalidHandleValue;
    res.addr = (void *)(intptr_t)__winerr();
  }
  return res;
}