[Bug] EINVAL on realtime signals

[kxxt]

nix failed to convert realtime signals to its Signal type: nix-rust/nix#495 nix-rust/nix#1143

Error: 
   0: EINVAL: Invalid argument

Location:
   src/tracer.rs:428

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
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   6: <core::result::Result<T,F> as core::ops::try_trait::FromResidual<core::result::Result<core::convert::Infallible,E>>>::from_residual::hf5f08fe6903eec58
      at /rustc/051478957371ee0084a7c0913941d2a8c4757bb9/library/core/src/result.rs:1989
   7: tracexec::tracer::Tracer::handle_waitpid_events::h9bc60738eb477e4d
      at /home/kxxt/repos/tracexec/src/tracer.rs:<unknown line>
   8: tracexec::tracer::Tracer::run::{{closure}}::hf1b180e85a144f8d
      at /home/kxxt/repos/tracexec/src/tracer.rs:383
   9: tracexec::tracer::Tracer::spawn::{{closure}}::{{closure}}::h27319ca7a0e74a54
      at /home/kxxt/repos/tracexec/src/tracer.rs:231
  10: tokio::runtime::park::CachedParkThread::block_on::{{closure}}::h718611086e8444dc
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/park.rs:281
  11: tokio::runtime::coop::with_budget::h10b614f0a24c5fae
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/coop.rs:107
  12: tokio::runtime::coop::budget::h2229e7fb74896048
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/coop.rs:73
  13: tokio::runtime::park::CachedParkThread::block_on::h51012a12d7711279
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/park.rs:281
  14: tokio::runtime::context::blocking::BlockingRegionGuard::block_on::h8bee69deed069e2d
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/context/blocking.rs:66
  15: tokio::runtime::handle::Handle::block_on_inner::{{closure}}::h782eb0c9f448dfc5
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/handle.rs:324
  16: tokio::runtime::context::runtime::enter_runtime::ha91d82383534a7e7
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/context/runtime.rs:65
  17: tokio::runtime::handle::Handle::block_on_inner::h7493d9dd433fbf49
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/handle.rs:323
  18: tokio::runtime::handle::Handle::block_on::hb0accc9355572497
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/handle.rs:302
  19: tracexec::tracer::Tracer::spawn::{{closure}}::h84211ed7abca7883
      at /home/kxxt/repos/tracexec/src/tracer.rs:229
  20: <tokio::runtime::blocking::task::BlockingTask<T> as core::future::future::Future>::poll::h5255f8c2acc6da06
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/blocking/task.rs:42
  21: tokio::runtime::task::core::Core<T,S>::poll::{{closure}}::hf25179e624e9674c
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/task/core.rs:328
  22: tokio::loom::std::unsafe_cell::UnsafeCell<T>::with_mut::hc6ec38a883074a78
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/loom/std/unsafe_cell.rs:16
  23: tokio::runtime::task::core::Core<T,S>::poll::h1bc64345a143ec90
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/task/core.rs:317
  24: tokio::runtime::task::harness::poll_future::{{closure}}::h92a0b4d1cb4d4175
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/task/harness.rs:485
  25: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hcc30e6e84a8755f2
      at /rustc/051478957371ee0084a7c0913941d2a8c4757bb9/library/core/src/panic/unwind_safe.rs:272
  26: std::panicking::try::do_call::h2380c61d23f4e2fe
      at /rustc/051478957371ee0084a7c0913941d2a8c4757bb9/library/std/src/panicking.rs:559
  27: std::panicking::try::h140959f2654e6ba4
      at /rustc/051478957371ee0084a7c0913941d2a8c4757bb9/library/std/src/panicking.rs:523
  28: std::panic::catch_unwind::hd09d75ec3011dc68
      at /rustc/051478957371ee0084a7c0913941d2a8c4757bb9/library/std/src/panic.rs:149
  29: tokio::runtime::task::harness::poll_future::h5c9c2e58cf5541fb
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/task/harness.rs:473
  30: tokio::runtime::task::harness::Harness<T,S>::poll_inner::h9b428e93ec133351
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/task/harness.rs:208
  31: tokio::runtime::task::harness::Harness<T,S>::poll::h0f9d20212739feae
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/task/harness.rs:153
  32: tokio::runtime::task::raw::RawTask::poll::h704950921fbc817b
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/task/raw.rs:201
  33: tokio::runtime::task::UnownedTask<S>::run::h0841c340346a04c0
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/task/mod.rs:464
  34: tokio::runtime::blocking::pool::Task::run::he174a74d162b7641
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/blocking/pool.rs:160
  35: tokio::runtime::blocking::pool::Inner::run::h72aa078198b4fdf7
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/blocking/pool.rs:518
  36: tokio::runtime::blocking::pool::Spawner::spawn_thread::{{closure}}::hedb586b16e80dc41
      at /home/kxxt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.3/src/runtime/blocking/pool.rs:476
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