win32mmap: set errno appropriately

It is not really helpful when a `git fetch` fails with the message:

	fatal: mmap failed: No error

In the particular instance encountered by a colleague of yours truly,
the Win32 error code was ERROR_COMMITMENT_LIMIT which means that the
page file is not big enough.

Let's make the message

	fatal: mmap failed: File too large

instead, which is only marginally better, but which can be associated
with the appropriate work-around: setting `core.packedGitWindowSize` to
a relatively small value.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2016-04-22 16:31:22 +02:00 коммит произвёл Junio C Hamano
Родитель 6a6636270f
Коммит 6a730e10a7
1 изменённых файлов: 8 добавлений и 2 удалений

Просмотреть файл

@ -24,15 +24,21 @@ void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t of
hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), NULL,
PAGE_WRITECOPY, 0, 0, NULL);
if (!hmap)
if (!hmap) {
errno = EINVAL;
return MAP_FAILED;
}
temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start);
if (!CloseHandle(hmap))
warning("unable to close file mapping handle");
return temp ? temp : MAP_FAILED;
if (temp)
return temp;
errno = GetLastError() == ERROR_COMMITMENT_LIMIT ? EFBIG : EINVAL;
return MAP_FAILED;
}
int git_munmap(void *start, size_t length)