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53 lines
1.2 KiB
53 lines
1.2 KiB
#include "../git-compat-util.h" |
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/* |
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* Note that this doesn't return the actual pagesize, but |
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* the allocation granularity. If future Windows specific git code |
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* needs the real getpagesize function, we need to find another solution. |
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*/ |
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int mingw_getpagesize(void) |
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{ |
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SYSTEM_INFO si; |
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GetSystemInfo(&si); |
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return si.dwAllocationGranularity; |
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} |
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void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
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{ |
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HANDLE hmap; |
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void *temp; |
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size_t len; |
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struct stat st; |
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uint64_t o = offset; |
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uint32_t l = o & 0xFFFFFFFF; |
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uint32_t h = (o >> 32) & 0xFFFFFFFF; |
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if (!fstat(fd, &st)) |
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len = xsize_t(st.st_size); |
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else |
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die("mmap: could not determine filesize"); |
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if ((length + offset) > len) |
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length = len - offset; |
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if (!(flags & MAP_PRIVATE)) |
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die("Invalid usage of mmap when built with USE_WIN32_MMAP"); |
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hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), 0, PAGE_WRITECOPY, |
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0, 0, 0); |
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if (!hmap) |
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return MAP_FAILED; |
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temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start); |
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if (!CloseHandle(hmap)) |
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warning("unable to close file mapping handle\n"); |
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return temp ? temp : MAP_FAILED; |
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} |
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int git_munmap(void *start, size_t length) |
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{ |
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return !UnmapViewOfFile(start); |
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}
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