Fixes#3691
We weren't checking if the file was empty before using its `at` function
member. This was causing an early crash if the config file existed but
was empty.
Consolidates the three locations that copy and pasted the json allocator
tools and adds an empty check for all of them.
Also adds two missing checks to the ThunksDB handler that could have
resulted in the same crash if ThunksDB was an empty file.
In preparation for seccomp execve inheritance where we need to extract
another FD from a different environment variable.
- Small function to extract the FD and also unset the environment
variable in the same place.
- Keeping the fetch and unset together instead of spreading to
another location in the source.
- Extract the FD upfront instead of passing the string_view around,
since we are unsetting the environment variable at the same place.
Future seccomp inheritance will get the FD just after the FEXFD
- `int FEXSeccompFD {GetFEXFDFromEnv("FEX_SECCOMPFD")};`
This was a bit confusing to read and I had always expected to change
this at some point.
Previous:
```
[INFO][1579518391560577][1601857.1601857] clone: Unsupported flags w/o CLONE_THREAD (Shared Resources), 4100
```
Now:
```
[INFO][1590468.992593376][1629501.1629501] clone: Unsupported flags w/o CLONE_THREAD (Shared Resources), 4100
```
This environment variable had an incorrect priority on the configuration
system. The expectation was higher priority than most other layers.
Now the only layer that has higher priority is the environment
variables.
Using the server mount folder works most of the time, but when running
under pressure-vessel this stacks directories in a weird way because the
mount folder has some tricks applied to it.
Expose the temp folder being used directly instead.
This option was disabled a few months ago when we switched the server
socket from a filesystem unix socket to an abstract socket.
This partially broke our chroot scripts which relied on this option
existing.
Readds support for an explicitly named abstract socket named from
config.
This is a workaround for dealing with chroots that change users.
They end up changing a user while doing operations and then can't
connect to the FEXServer anymore because environment variables have been
wiped away.
This relies on wine's behaviour passing through linux paths and env vars,
so that the config in the user's home directory can be accessed outside
of the wine prefix.
FEXCore has no need to understand how to load these layers. Which
requires json parsing.
Move these to the frontend which is already doing the configuration
layer setup and initialization tasks anyway.
Means FEXCore itself no longer needs to link to tiny-json which can be
left to the frontend.
This lets all the path generation for the config to be in the frontend.
This then informs FEXCore where things should live.
This is for llvm-mingw. While paths aren't quite generated correctly,
this gets the code closer to compiling.
Ryan Houdek