Here is simple and restricted implementation of mmap using CreateFileMapping,
MapViewOfFile.
---
compat/mingw.c | 27 +++++++++++++++++++++++++++
compat/mingw.h | 6 ++++++
git-compat-util.h | 2 ++
3 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/compat/mingw.c b/compat/mingw.c
index b534a8a..a6a5081 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -994,3 +994,30 @@ void mingw_open_html(const char *unixpath)
printf("Launching default browser to display HTML ...\n");
ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
}
+
+void *mingw_mmap(void *start, size_t length, int prot, int flags, int fd,
off_t offset)
+{
+ HANDLE handle;
+
+ if (start != NULL || !(flags & MAP_PRIVATE))
+ die("Invalid usage of mingw_mmap");
+
+ if (offset % getpagesize() != 0)
+ die("Offset does not match the memory allocation granularity");
+
+ handle = CreateFileMapping((HANDLE)_get_osfhandle(fd), NULL,
PAGE_WRITECOPY,
+ 0, 0, NULL);
+
+ if (handle != NULL) {
+ start = MapViewOfFile(handle, FILE_MAP_COPY, 0, offset,
length);
+ CloseHandle(handle);
+ }
+
+ return start;
+}
+
+int mingw_munmap(void *start, size_t length)
+{
+ UnmapViewOfFile(start);
+ return 0;
+}
diff --git a/compat/mingw.h b/compat/mingw.h
index 4f275cb..1b2a098 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -183,6 +183,12 @@ static inline unsigned int git_ntohl(unsigned int x)
sig_handler_t mingw_signal(int sig, sig_handler_t handler);
#define signal mingw_signal
+void *mingw_mmap(void *start, size_t length, int prot, int flags, int fd,
off_t offset);
+#define mmap mingw_mmap
+
+int mingw_munmap(void *start, size_t length);
+#define munmap mingw_munmap
+
/*
* ANSI emulation wrappers
*/
diff --git a/git-compat-util.h b/git-compat-util.h
index e20b1e8..8f3d070 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -175,10 +175,12 @@ static inline const char *skip_prefix(const char *str,
const char *prefix)
#define MAP_FAILED ((void*)-1)
#endif
+#ifndef __MINGW32__
#define mmap git_mmap
#define munmap git_munmap
extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd,
off_t offset);
extern int git_munmap(void *start, size_t length);
+#endif
/* This value must be multiple of (pagesize * 2) */
#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
--
1.5.6.1.1071.g76fb
--
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