Rollup of 7 pull requests#89560

Closed

Manishearth wants to merge 19 commits into

rust-lang:masterfrom

Manishearth:rollup-zanstud

Commits on Sep 10, 2021

Use `libc::sigaction()` instead of `sys::signal()` to prevent a deadlock
FabianWolff
committed

Commits on Sep 29, 2021

Clean up unneeded explicit pointer cast
dtolnay
committed

Commits on Oct 1, 2021

Call `libc::sigaction()` only on Android
FabianWolff
committed

Commits on Oct 3, 2021

Fix Lower/UpperExp formatting for integers and precision zero
FabianWolff
committed

Commits on Oct 4, 2021

Commits on Oct 5, 2021