mman library for Windows

A light implementation of the mmap functions for MinGW.

The mmap-win32 library implements a wrapper for mmap functions around the memory mapping Windows API.

Modified copy of mman-win32 from Google Code Archive
Original can also be found here, on Github.

This project was adapted from the above original to address issues found when trying to use it in mingw32 / mingw64 to add mmap capabilities to the Micro Mac (umac) project. In umac, the following code block is used:

        ofd = open(rom_filename, O_RDONLY);
        // ...
        struct stat sb;
        fstat(ofd, &sb);
        off_t _rom_size = sb.st_size;
        rom_base = mmap(0, _rom_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, ofd, 0);

i.e., open a file in read-only mode, then create a memory map for that which can be modified.

This fails in the original mman-win32 version, as Windows doesn't allow creating a read/write mapping for a file opened in read-only mode. I've added a little fix for that - might be a bit too generic, but works for my purposes.

Installation

The easiest way, in MSYS2 (mingw32, mingw64 etc), would be to execute the usual sequence
./configure --prefix=$MSYSTEM_PREFIX --libdir=$MSYSTEM_PREFIX/lib --incdir=$MSYSTEM_PREFIX/include/sys
make
make install
which installs the lib and header in the directories where an unmodified project would search for them.
Plus, add -lmman to the linker command for any project that uses it.