From e1ba2f7141aaa11a30a239ff597a0d6a3080e2a0 Mon Sep 17 00:00:00 2001
From: guochao <guochao@cn.nutstore.net>
Date: Fri, 3 Nov 2023 10:09:56 +0800
Subject: [PATCH] fix the problem when subprcess clone again

---
 src/main.rs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 08a142d..955fc31 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -74,7 +74,9 @@ fn main() -> anyhow::Result<()> {
 
             loop {
                 log::debug!("parent: waitpid...");
-                match waitpid(child, None)? {
+                let waitstatus = waitpid(child, None)?;
+
+                match waitstatus {
                     WaitStatus::Exited(pid, ret) => {
                         log::info!("child {pid} exited with return code {ret}");
                         break;
@@ -96,7 +98,9 @@ fn main() -> anyhow::Result<()> {
                     }
                     _ => {}
                 }
-                nix::sys::ptrace::cont(child, None)?;
+                if let Some(pid) = waitstatus.pid() {
+                    nix::sys::ptrace::cont(pid, None)?;
+                }
             }
             return Ok(());
         }
@@ -171,4 +175,3 @@ fn main() -> anyhow::Result<()> {
 
     panic!("unreachable");
 }
-