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Ryan Houdek
3b5d0e3e27
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")};`