зеркало из https://github.com/microsoft/git.git
54 строки
1.2 KiB
C
54 строки
1.2 KiB
C
#include "../git-compat-util.h"
|
|
|
|
/*
|
|
* Note that this doesn't return the actual pagesize, but
|
|
* the allocation granularity. If future Windows specific git code
|
|
* needs the real getpagesize function, we need to find another solution.
|
|
*/
|
|
int mingw_getpagesize(void)
|
|
{
|
|
SYSTEM_INFO si;
|
|
GetSystemInfo(&si);
|
|
return si.dwAllocationGranularity;
|
|
}
|
|
|
|
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);
|
|
}
|