42 lines
904 B
C
42 lines
904 B
C
|
#include "../git-compat-util.h"
|
||
|
|
|
||
|
|
void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
|
||
|
|
{
|
||
|
|
HANDLE hmap;
|
||
|
|
void *temp;
|
||
|
|
size_t len;
|
||
|
|
struct stat st;
|
||
|
|
uint64_t o = offset;
|
||
|
|
uint32_t l = o & 0xFFFFFFFF;
|
||
|
|
uint32_t h = (o >> 32) & 0xFFFFFFFF;
|
||
|
|
|
||
|
|
if (!fstat(fd, &st))
|
||
|
|
len = xsize_t(st.st_size);
|
||
|
|
else
|
||
|
|
die("mmap: could not determine filesize");
|
||
|
|
|
||
|
|
if ((length + offset) > len)
|
||
|
|
length = len - offset;
|
||
|
|
|
||
|
|
if (!(flags & MAP_PRIVATE))
|
||
|
|
die("Invalid usage of mmap when built with USE_WIN32_MMAP");
|
||
|
|
|
||
|
|
hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), 0, PAGE_WRITECOPY,
|
||
|
|
0, 0, 0);
|
||
|
|
|
||
|
|
if (!hmap)
|
||
|
|
return MAP_FAILED;
|
||
|
|
|
||
|
|
temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start);
|
||
|
|
|
||
|
|
if (!CloseHandle(hmap))
|
||
|
|
warning("unable to close file mapping handle\n");
|
||
|
|
|
||
|
|
return temp ? temp : MAP_FAILED;
|
||
|
|
}
|
||
|
|
|
||
|
|
int git_munmap(void *start, size_t length)
|
||
|
|
{
|
||
|
|
return !UnmapViewOfFile(start);
|
||
|
|
}
|