diff options
| -rw-r--r-- | utils/mmap-windows.c | 100 | ||||
| -rw-r--r-- | utils/porting.h | 12 |
2 files changed, 110 insertions, 2 deletions
diff --git a/utils/mmap-windows.c b/utils/mmap-windows.c new file mode 100644 index 000000000..1799392f0 --- /dev/null +++ b/utils/mmap-windows.c @@ -0,0 +1,100 @@ +/* mmap() replacement for Windows + * + * Author: Mike Frysinger <vapier@gentoo.org> + * Placed into the public domain + */ + +/* References: + * CreateFileMapping: http://msdn.microsoft.com/en-us/library/aa366537(VS.85).aspx + * CloseHandle: http://msdn.microsoft.com/en-us/library/ms724211(VS.85).aspx + * MapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366761(VS.85).aspx + * UnmapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366882(VS.85).aspx + */ + +#include <io.h> +#include <windows.h> +#include <sys/types.h> + +#define PROT_READ 0x1 +#define PROT_WRITE 0x2 +/* This flag is only available in WinXP+ */ +#ifdef FILE_MAP_EXECUTE +#define PROT_EXEC 0x4 +#else +#define PROT_EXEC 0x0 +#define FILE_MAP_EXECUTE 0 +#endif + +#define MAP_SHARED 0x01 +#define MAP_PRIVATE 0x02 +#define MAP_ANONYMOUS 0x20 +#define MAP_ANON MAP_ANONYMOUS +#define MAP_FAILED ((void *) -1) + +#ifdef __USE_FILE_OFFSET64 +# define DWORD_HI(x) (x >> 32) +# define DWORD_LO(x) ((x) & 0xffffffff) +#else +# define DWORD_HI(x) (0) +# define DWORD_LO(x) (x) +#endif + +static void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) +{ + if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) + return MAP_FAILED; + if (fd == -1) { + if (!(flags & MAP_ANON) || offset) + return MAP_FAILED; + } else if (flags & MAP_ANON) + return MAP_FAILED; + + DWORD flProtect; + if (prot & PROT_WRITE) { + if (prot & PROT_EXEC) + flProtect = PAGE_EXECUTE_READWRITE; + else + flProtect = PAGE_READWRITE; + } else if (prot & PROT_EXEC) { + if (prot & PROT_READ) + flProtect = PAGE_EXECUTE_READ; + else if (prot & PROT_EXEC) + flProtect = PAGE_EXECUTE; + } else + flProtect = PAGE_READONLY; + + off_t end = length + offset; + HANDLE mmap_fd, h; + if (fd == -1) + mmap_fd = INVALID_HANDLE_VALUE; + else + mmap_fd = (HANDLE)_get_osfhandle(fd); + h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL); + if (h == NULL) + return MAP_FAILED; + + DWORD dwDesiredAccess; + if (prot & PROT_WRITE) + dwDesiredAccess = FILE_MAP_WRITE; + else + dwDesiredAccess = FILE_MAP_READ; + if (prot & PROT_EXEC) + dwDesiredAccess |= FILE_MAP_EXECUTE; + if (flags & MAP_PRIVATE) + dwDesiredAccess |= FILE_MAP_COPY; + void *ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length); + if (ret == NULL) { + CloseHandle(h); + ret = MAP_FAILED; + } + return ret; +} + +static void munmap(void *addr, size_t length) +{ + UnmapViewOfFile(addr); + /* ruh-ro, we leaked handle from CreateFileMapping() ... */ +} + +#undef DWORD_HI +#undef DWORD_LO diff --git a/utils/porting.h b/utils/porting.h index becd7acaa..6bb7fa91f 100644 --- a/utils/porting.h +++ b/utils/porting.h @@ -22,10 +22,18 @@ #include <sys/param.h> #include <sys/stat.h> #include <sys/types.h> -#include <sys/wait.h> + +#ifdef __LDSO_LDD_SUPPORT__ +# include <sys/wait.h> +#endif + +#if defined(_WIN32) || defined(_WINNT) +# include "mmap-windows.c" +#else +# include <sys/mman.h> +#endif #include <link.h> -#include <sys/mman.h> /* makefile will include elf.h for us */ #include "bswap.h" |