Revision 48c07d868419f1597e87dcb4743a0a9f5828daa9 authored by Ralf Thielow on 29 January 2012, 12:55:33 UTC, committed by Junio C Hamano on 29 January 2012, 21:30:58 UTC
Signed-off-by: Ralf Thielow <ralf.thielow@googlemail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 828ea97
win32mmap.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;
off_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 = st.st_size;
else
die("mmap: could not determine filesize");
if ((length + offset) > len)
length = xsize_t(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);
}
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