fix: reduce idle agent checker CPU

refs #300

3 files changed, 44 insertions, 0 deletions

diff --git a/src/platform/fallback.rs b/src/platform/fallback.rs
index 825aaccd..a8f9d8ce 100644
--- a/src/platform/fallback.rs
+++ b/src/platform/fallback.rs
@@ -8,6 +8,11 @@ pub fn foreground_job(_child_pid: u32) -> Option<ForegroundJob> {
 }
 
 /// Unsupported platform stub.
+pub fn foreground_group_leader_job(_process_group_id: u32) -> Option<ForegroundJob> {
+    None
+}
+
+/// Unsupported platform stub.
 pub fn foreground_process_group_id(_child_pid: u32) -> Option<u32> {
     None
 }
diff --git a/src/platform/linux.rs b/src/platform/linux.rs
index 73a4f0a5..00f4b906 100644
--- a/src/platform/linux.rs
+++ b/src/platform/linux.rs
@@ -54,6 +54,25 @@ pub fn foreground_job(child_pid: u32) -> Option<ForegroundJob> {
     })
 }
 
+pub fn foreground_group_leader_job(process_group_id: u32) -> Option<ForegroundJob> {
+    let (pgrp, name) = process_pgrp_and_comm(process_group_id)?;
+    if pgrp as u32 != process_group_id {
+        return None;
+    }
+
+    let argv = process_argv(process_group_id);
+    Some(ForegroundJob {
+        process_group_id,
+        processes: vec![ForegroundProcess {
+            pid: process_group_id,
+            name,
+            argv0: None,
+            cmdline: argv.as_ref().map(|parts| parts.join(" ")),
+            argv,
+        }],
+    })
+}
+
 pub fn foreground_process_group_id(child_pid: u32) -> Option<u32> {
     // /proc/<pid>/stat format: "pid (comm) state ppid pgrp session tty_nr tpgid ..."
     // The (comm) field can contain spaces and parens, so we find the last ')' first.
diff --git a/src/platform/macos.rs b/src/platform/macos.rs
index bfce664a..354a6b3c 100644
--- a/src/platform/macos.rs
+++ b/src/platform/macos.rs
@@ -52,6 +52,26 @@ pub fn foreground_job(child_pid: u32) -> Option<ForegroundJob> {
     })
 }
 
+pub fn foreground_group_leader_job(process_group_id: u32) -> Option<ForegroundJob> {
+    let info = process_bsdinfo(process_group_id)?;
+    if info.pbi_pgid != process_group_id {
+        return None;
+    }
+
+    let name = comm_from_bsdinfo(&info)?;
+    let argv = process_argv(process_group_id);
+    Some(ForegroundJob {
+        process_group_id,
+        processes: vec![ForegroundProcess {
+            pid: process_group_id,
+            name,
+            argv0: process_argv0_name(process_group_id),
+            cmdline: argv.as_ref().map(|parts| parts.join(" ")),
+            argv,
+        }],
+    })
+}
+
 fn process_group_pids(process_group_id: u32) -> Vec<u32> {
     let mut capacity = 16usize;