feat: impl From<Signal> for SigSet

Author: JonathanWoollett-Light

CHANGELOG.md

@@ -9,6 +9,11 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - Fix `SigSet` incorrect implementation of `Eq`, `PartialEq` and `Hash`
   ([#1946](https://github.com/nix-rust/nix/pull/1946))
 
+### Added
+
+- Added `impl From<Signal> for SigSet`.
+  ([#1959](https://github.com/nix-rust/nix/pull/1959))
+
 ### Changed
 
 - The following APIs now take an implementation of `AsFd` rather than a

src/sys/signal.rs

@@ -604,6 +604,14 @@ impl SigSet {
     }
 }
 
+impl From<Signal> for SigSet {
+    fn from(signal: Signal) -> SigSet {
+        let mut sigset = SigSet::empty();
+        sigset.add(signal);
+        sigset
+    }
+}
+
 impl AsRef<libc::sigset_t> for SigSet {
     fn as_ref(&self) -> &libc::sigset_t {
         &self.sigset