From 5607854bcb48a36aa714ce04feda318f6eb6b36d Mon Sep 17 00:00:00 2001
From: Galaxy <ganli2012@gmail.com>
Date: Tue, 4 Jun 2024 17:55:29 -0700
Subject: [PATCH] Fix bug: Infinite loop in GetTgid.

When reading /proc/<pid>/status of short lived processes,
file is successfully opened by ifstream. But before reading stream,
the process disappears and leave a bad stream, then the loop is endless.

Solution: Check stream by calling ifstream.bad() after reading.
---
 util/process_map.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/util/process_map.cpp b/util/process_map.cpp
index d6b88e0..89938b5 100644
--- a/util/process_map.cpp
+++ b/util/process_map.cpp
@@ -120,6 +120,11 @@ static int GetTgid(pid_t pid)
             return -1;
         }
         statusFile >> token;
+        if (statusFile.bad()) {
+            // The file may be successfully opened before while loop,
+            // but disappear before reading stream.
+            return -1;
+        }
         if (token == "Tgid:") {
             foundTgid = true;
             continue;
-- 
Gitee