1 files changed, 27 insertions, 0 deletions
diff --git a/src/platform/linux.rs b/src/platform/linux.rs
new file mode 100644
index 00000000..001ef03e
--- /dev/null
+++ b/src/platform/linux.rs
@@ -0,0 +1,27 @@
+use std::path::PathBuf;
+
+/// Get the foreground process name for a given child PID.
+/// Uses /proc/<pid>/stat to find the tpgid, then /proc/<tpgid>/comm.
+pub fn foreground_process_name(child_pid: u32) -> Option<String> {
+    // /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.
+    let stat = std::fs::read_to_string(format!("/proc/{child_pid}/stat")).ok()?;
+    let rest = stat.get(stat.rfind(')')? + 2..)?;
+    let fields: Vec<&str> = rest.split_whitespace().collect();
+    // After (comm): state(0) ppid(1) pgrp(2) session(3) tty_nr(4) tpgid(5)
+    let tpgid: i32 = fields.get(5)?.parse().ok()?;
+    if tpgid <= 0 {
+        return None;
+    }
+    let comm = std::fs::read_to_string(format!("/proc/{tpgid}/comm")).ok()?;
+    Some(comm.trim().to_string())
+}
+
+/// Get the current working directory of a process.
+/// Uses /proc/<pid>/cwd symlink.
+pub fn process_cwd(pid: u32) -> Option<PathBuf> {
+    if pid == 0 {
+        return None;
+    }
+    std::fs::read_link(format!("/proc/{pid}/cwd")).ok()
+}