nix-super/tests/unit
John Ericson 6208ca7209 Separate SystemError from SysError
Most of this is a `catch SysError` -> `catch SystemError` sed. This
is a rather pure-churn change I would like to get out of the way. **The
intersting part is `src/libutil/error.hh`.**

On Unix, we will only throw the `SysError` concrete class, which has
the same constructors that `SystemError` used to have.

On Windows, we will throw `WinError` *and* `SysError`. `WinError`
(which will be created in a later PR), will use a `DWORD` instead of
`int` error value, and `GetLastError()`, which is the Windows equivalent
of the `errno` machinery. Windows will *also* use `SysError` because
Window's "libc" (MSVCRT) implements the POSIX interface, and we use it
too.

As the docs describe, while we *throw* one of the 3 choices above (2
concrete classes or the alias), we should always *catch* `SystemError`.
This ensures no matter how the implementation changes for Windows (e.g.
between `SysError` and `WinError`) the catching logic stays the same
and stays correct.

Co-Authored-By volth <volth@volth.com>
Co-Authored-By Eugene Butler <eugene@eugene4.com>
2024-01-12 12:00:33 -05:00
..
libexpr Unify and refactor value printing 2024-01-11 16:34:36 -08:00
libexpr-support Only link with -pthread on Unix 2024-01-10 20:38:39 -05:00
libstore worker protocol: serialise cgroup stats in BuildResult (#9598) 2023-12-13 16:37:17 -05:00
libstore-support Only link with -pthread on Unix 2024-01-10 20:38:39 -05:00
libutil Separate SystemError from SysError 2024-01-12 12:00:33 -05:00
libutil-support Only link with -pthread on Unix 2024-01-10 20:38:39 -05:00