Related to #3224
Previously, Ghostty used a static API for async event handling: io_uring
on Linux, kqueue on macOS. This commit changes the backend to be dynamic
on Linux so that epoll will be used if io_uring isn't available, or if
the user explicitly chooses it.
This introduces a new config `async-backend` (default "auto") which can
be set by the user to change the async backend in use. This is a
best-effort setting: if the user requests io_uring but it isn't
available, Ghostty will fall back to something that is and that choice
is up to us.
Basic benchmarking both in libxev and Ghostty (vtebench) show no
noticeable performance differences introducing the dynamic API, nor
choosing epoll over io_uring.
Fixes#5359
The comments explain what's going on. Longer term we should adjust our
termio/exec to avoid the SIGPIPE but its still possible (i.e. that
thread crashes) to happen so we should be robust to it.
Fixes#3202
Two changes to get here:
1. Do not fail startup if crash reporting initialization fails. This is a
non-critical feature and should not prevent the terminal from starting.
2. Avoid freeing Sentry transport on error path. This segfaults.
Upstream issue will be reported separately.
