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Fix suspend when running hx within git #1843

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Fix suspend when running hx within git #1843

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23 changes: 23 additions & 0 deletions Cargo.lock
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1 change: 1 addition & 0 deletions helix-term/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,7 @@ grep-searcher = "0.1.8"

# Remove once retain_mut lands in stable rust
retain_mut = "0.1.7"
nix = "0.23"

[target.'cfg(not(windows))'.dependencies] # https://github.com/vorner/signal-hook/issues/100
signal-hook-tokio = { version = "0.3", features = ["futures-v0_3"] }
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17 changes: 12 additions & 5 deletions helix-term/src/application.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -31,10 +31,7 @@ use crossterm::{
tty::IsTty,
};
#[cfg(not(windows))]
use {
signal_hook::{consts::signal, low_level},
signal_hook_tokio::Signals,
};
use {signal_hook::consts::signal, signal_hook_tokio::Signals};
#[cfg(windows)]
type Signals = futures_util::stream::Empty<()>;

Expand Down Expand Up @@ -254,9 +251,19 @@ impl Application {
use helix_view::graphics::Rect;
match signal {
signal::SIGTSTP => {
use nix::{
sys::signal::{self, Signal},
unistd::Pid,
};
self.compositor.save_cursor();
self.restore_term().unwrap();
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It seems to me that you didn't follow the signal-hook docs: you're supposed to call low_level::raise(SIGSTOP)?;, not emulate_default_handler: https://docs.rs/signal-hook/latest/signal_hook/#a-complex-signal-handling-with-a-background-thread

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Hmm, seems to be the same underlying call though

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Yes, it's the same thing.

low_level::emulate_default_handler(signal::SIGTSTP).unwrap();
// low_level::emulate_default_handler(signal::SIGSTSP) only
// send SIGSTOP to the current process but since we use
// multi-process tokio, at times like using helix within
// git suspend will not work since only the current process
// is suspended, so we had to send SIGSTOP signal to the
// whole process to make sure it is suspended correctly.
signal::kill(Pid::from_raw(0), Signal::SIGSTOP).unwrap();
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@pickfire pickfire Mar 19, 2022 •
edited
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@archseer I can change it to libc::kill if you want since nix is an extra new crate now (libc we already need it anyway) but we only use this one line, but using libc directly will need unsafe and might take up several lines.

}
signal::SIGCONT => {
self.claim_term().await.unwrap();
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