config: add pid client criteria

src/criteria/clm/clm_matchers.rs

@@ -17,6 +17,7 @@ macro_rules! fixed_root_criterion {
     };
 }
 
+pub mod clmm_pid;
 pub mod clmm_sandboxed;
 pub mod clmm_string;
 pub mod clmm_uid;

src/criteria/clm/clm_matchers/clmm_pid.rs

@@ -0,0 +1,20 @@
+use {
+    crate::{
+        client::Client,
+        criteria::{RootMatcherMap, clm::RootMatchers, crit_graph::CritRootCriterion},
+    },
+    std::rc::Rc,
+    uapi::c,
+};
+
+pub struct ClmMatchPid(pub c::pid_t);
+
+impl CritRootCriterion<Rc<Client>> for ClmMatchPid {
+    fn matches(&self, data: &Rc<Client>) -> bool {
+        data.pid_info.pid == self.0
+    }
+
+    fn nodes(roots: &RootMatchers) -> Option<&RootMatcherMap<Rc<Client>, Self>> {
+        Some(&roots.pid)
+    }
+}