Do not close stderr/stdout before program finish

Programs like grep called in '$' command will fail due to SIGPIPE
for example. So we need to keep the pipe open.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/event_manager.cc b/src/event_manager.cc
index 21cd6331..0b345fc2 100644
--- a/src/event_manager.cc
+++ b/src/event_manager.cc
@@ -25,8 +25,11 @@ void FDWatcher::run(EventMode mode)
 
 void FDWatcher::close_fd()
 {
-    close(m_fd);
-    m_fd = -1;
+    if (m_fd != -1)
+    {
+        close(m_fd);
+        m_fd = -1;
+    }
 }
 
 Timer::Timer(TimePoint date, Callback callback, EventMode mode)