amex/nvram.c: Relax file sharing mode

QoL hack for Chunithm support.
This commit is contained in:
Tau 2019-06-09 15:38:43 -04:00
parent 47238b210b
commit 67c1fcedea

View File

@ -21,10 +21,25 @@ HRESULT nvram_open_file(HANDLE *out, const wchar_t *path, size_t size)
*out = NULL;
/* This is somewhat sloppy: allow multiple processes to open the backing
store simultaneously. Multiple processes don't actually need to open
the backing store simultaneously, but it allows use to reuse the same
chunihook.dll for both chuniApp.exe and aimeReaderHost.exe, since a
backing store fd gets opened during process init and subsequentely
re-used for all device open operations on that NVRAM.
We could defer the file open until it is actually needed instead, but
this requires some messy locking; naive solutions would be racy or would
effectively block all but one thread at a time in the process from
performing any I/O.
Hopefully some day Chunithm will move to the new amdaemon-based system
architecture. */
file = CreateFileW(
path,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL,