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330 lines
7.9 KiB
C++
330 lines
7.9 KiB
C++
#pragma once
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// portable mmap() implementation
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//
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// - supports win32 (needs vista+)
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// - supports posix.1 (no map_anonymous)
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//
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// notes on windows
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//
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// - no errno support
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// - not designed to support mprotect()
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// - very poor support for memory intervals
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#if defined(_MSC_VER) || defined(__MINGW32__)
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#ifndef __MINGW32__
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#include <Windows.h>
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#include <strsafe.h>
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#else
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#include <windows.h>
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#endif
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#include <io.h>
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#include <atomic>
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#include <map>
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#ifndef PROT_READ
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#define PROT_READ 1
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#endif
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#ifndef PROT_WRITE
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#define PROT_WRITE 2
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#endif
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#ifndef PROT_EXEC
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#define PROT_EXEC 4
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#endif
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#ifndef MAP_SHARED
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#define MAP_SHARED 1
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#endif
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#ifndef MAP_PRIVATE
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#define MAP_PRIVATE 2
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#endif
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#ifndef MAP_FIXED
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#define MAP_FIXED 16
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#endif
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS 32
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#endif
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void*)-1)
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY _O_RDWR // intentional smudge for mmap()
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#endif
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#ifndef O_WRONLY
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#define O_WRONLY _O_WRONLY
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#endif
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#ifndef O_RDWR
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#define O_RDWR _O_RDWR
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#endif
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#ifndef O_CREAT
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#define O_CREAT _O_CREAT
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#endif
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#ifndef O_TRUNC
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#define O_TRUNC _O_TRUNC
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#endif
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#ifndef O_EXCL
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#define O_EXCL _O_EXCL
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#endif
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#ifndef MADV_NORMAL
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#define MADV_NORMAL 0
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#endif
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#ifndef MADV_DONTNEED
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#define MADV_DONTNEED 4
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#endif
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#ifndef MADV_RANDOM
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#define MADV_RANDOM 1
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#endif
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#ifndef MADV_SEQUENTIAL
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#define MADV_SEQUENTIAL 2
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#endif
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#ifndef MADV_WILLNEED
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#define MADV_WILLNEED 3
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#endif
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#ifndef mmap
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#define mmap WinMap
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#endif
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#ifndef munmap
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#define munmap WinUnmap
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#endif
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#ifndef open
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#define open _open
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#endif
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#ifndef close
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#define close _close
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#endif
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#ifndef fstat
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#define fstat _fstati64
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#endif
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#ifndef madvise
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#define madvise WinMadvise
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#endif
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#ifndef ftruncate
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#define ftruncate WinFtruncate
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#endif
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static std::atomic<unsigned> g_winlock;
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static std::map<LPVOID, HANDLE> g_winmap;
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static void WinLock(void) {
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while (!g_winlock.exchange(1, std::memory_order_acquire));
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}
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static void WunLock(void) {
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g_winlock.store(0, std::memory_order_release);
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}
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static int WinMadvise(char* fd, size_t length, int flags) {
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auto p_handle = GetCurrentProcess();
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struct _WIN32_MEMORY_RANGE_ENTRY entry((void*)fd, length);
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bool success = PrefetchVirtualMemory(p_handle, 1, &entry, 0);
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if (!success) {
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LPVOID lpMsgBuf;
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LPVOID lpDisplayBuf;
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DWORD error_code = GetLastError();
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FormatMessage(
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FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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error_code,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR)&lpMsgBuf,
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0, NULL);
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lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT,
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(lstrlen((LPCTSTR)lpMsgBuf) + 256) * sizeof(TCHAR));
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StringCchPrintf((LPTSTR)lpDisplayBuf,
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LocalSize(lpDisplayBuf) / sizeof(TCHAR),
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TEXT("%s failed with error %d: %s"),
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error_code, lpMsgBuf);
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}
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return 0;
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}
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static int WinFtruncate(int fd, uint64_t length) {
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return _chsize_s(fd, length) ? -1 : 0;
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}
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static int WinUnmap(void *addr, size_t length) {
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HANDLE hand;
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WinLock();
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hand = g_winmap[addr];
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g_winmap[addr] = 0;
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WunLock();
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if (hand) {
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UnmapViewOfFile(addr);
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CloseHandle(hand);
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return 0;
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} else {
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return -1;
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}
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}
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static void *WinMap(void *addr, size_t length, int prot,
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int flags, int fd, uint64_t offset) {
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HANDLE hFile;
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DWORD winprot;
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DWORD access = 0;
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HANDLE hand = NULL;
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LPVOID res = NULL;
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if (prot & PROT_READ) {
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access |= FILE_MAP_READ;
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}
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if (prot & PROT_WRITE) {
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access |= FILE_MAP_WRITE;
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}
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if (prot & PROT_EXEC) {
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access |= FILE_MAP_EXECUTE;
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}
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if (flags & MAP_PRIVATE) {
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// private mapping
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if (prot & PROT_EXEC) {
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if (prot & PROT_WRITE) {
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if (flags & MAP_ANONYMOUS) {
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winprot = PAGE_EXECUTE_READWRITE;
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} else {
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winprot = PAGE_EXECUTE_WRITECOPY;
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}
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} else {
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winprot = PAGE_EXECUTE_READ;
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}
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} else if (prot & PROT_WRITE) {
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if (flags & MAP_ANONYMOUS) {
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winprot = PAGE_READWRITE;
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} else {
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winprot = PAGE_WRITECOPY;
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}
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} else {
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winprot = PAGE_READONLY;
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}
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} else {
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// shared mapping
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if (prot & PROT_EXEC) {
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if (prot & PROT_WRITE) {
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winprot = PAGE_EXECUTE_READWRITE;
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} else {
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winprot = PAGE_EXECUTE_READ;
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}
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} else if (prot & PROT_WRITE) {
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winprot = PAGE_READWRITE;
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} else {
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winprot = PAGE_READONLY;
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}
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}
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if (flags & MAP_ANONYMOUS) {
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hFile = INVALID_HANDLE_VALUE;
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offset = 0;
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} else {
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hFile = (HANDLE)_get_osfhandle(fd);
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if (hFile == INVALID_HANDLE_VALUE) {
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return MAP_FAILED;
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}
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}
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if (flags & MAP_FIXED) {
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if (!addr) {
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return MAP_FAILED;
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} else {
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WinUnmap(addr, length);
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}
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}
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hand = CreateFileMapping(hFile, 0, winprot,
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(offset + length) >> 32,
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(offset + length), 0);
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if (!hand) {
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LPVOID lpMsgBuf;
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LPVOID lpDisplayBuf;
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DWORD error_code = GetLastError();
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FormatMessage(
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FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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error_code,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR)&lpMsgBuf,
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0, NULL);
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lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT,
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(lstrlen((LPCTSTR)lpMsgBuf) + 256) * sizeof(TCHAR));
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StringCchPrintf((LPTSTR)lpDisplayBuf,
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LocalSize(lpDisplayBuf) / sizeof(TCHAR),
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TEXT("%s failed with error %d: %s"),
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error_code, lpMsgBuf);
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return MAP_FAILED;
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}
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if (winprot == PAGE_WRITECOPY) {
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access = FILE_MAP_COPY;
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}
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res = MapViewOfFileEx(hand, access, offset >> 32,
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offset, length, addr);
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if (!res) {
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LPVOID lpMsgBuf;
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LPVOID lpDisplayBuf;
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DWORD error_code = GetLastError();
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FormatMessage(
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FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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error_code,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR)&lpMsgBuf,
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0, NULL);
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lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT,
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(lstrlen((LPCTSTR)lpMsgBuf) + 40) * sizeof(TCHAR));
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StringCchPrintf((LPTSTR)lpDisplayBuf,
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LocalSize(lpDisplayBuf) / sizeof(TCHAR),
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TEXT("failed with error %d: %s"),
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error_code, lpMsgBuf);
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fprintf(stderr, (char*)lpDisplayBuf);
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CloseHandle(hand);
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return MAP_FAILED;
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}
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WinLock();
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g_winmap[res] = hand;
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WunLock();
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return res;
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}
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#else
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#include <unistd.h>
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#include <sys/mman.h>
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS 0x10000000
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static void *PosixMmap(void *addr, size_t length, int prot,
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int flags, int fd, uint64_t offset) {
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int tfd;
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void *res;
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char path[] = "/tmp/llama.dat.XXXXXX";
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if (~flags & MAP_ANONYMOUS) {
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res = mmap(addr, length, prot, flags, fd, offset);
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} else if ((tfd = mkstemp(path)) != -1) {
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unlink(path);
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if (!ftruncate(tfd, length)) {
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res = mmap(addr, length, prot, flags & ~MAP_ANONYMOUS, tfd, 0);
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} else {
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res = MAP_FAILED;
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}
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close(tfd);
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} else {
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res = MAP_FAILED;
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}
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return res;
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}
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#ifndef mmap
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#define mmap PosixMmap
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#endif
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#endif // MAP_ANONYMOUS
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#endif // _MSC_VER
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