Attach gdb on demand in rust

example.rs

mod gdb_break;

pub fn main() {
  // this will create a new tmux session with gdb
  // To let the program continue run `detach` in gdb and close it
  gdb_break();
}

gdb_break.rs

use std::process::Command;

use libc::{syscall, SYS_gettid, pid_t};

pub fn gdb_break() {
    let tid = unsafe { syscall(SYS_gettid) as pid_t }.to_string();

    println!("GDB PROBE HIT, WAITING");
    // 1. finish: wait4
    // 2. finish: Process::wait
    // 3. finish: gdb::break
    // 4. finish: caller
    let args = vec![
        "-c", "tmux new-window sudo -E gdb --pid \"$0\" -ex \"shell kill -9 $$\" -ex finish -ex finish -ex finish -ex finish; kill -STOP $$", &tid
    ];
    let _ = Command::new("sh").args(args.as_slice()).status();
}