Closes #139

include/boost/process/detail/child_decl.hpp

@@ -145,11 +145,12 @@ class child
 
     bool running(std::error_code & ec) noexcept
     {
-        if (valid() && !_exited())
+        ec.clear();
+        if (valid() && !_exited() && !ec)
         {
             int exit_code = 0;
             auto res = boost::process::detail::api::is_running(_child_handle, exit_code, ec);
-            if (!res && !_exited())
+            if (!ec && !res && !_exited())
                 _exit_status->store(exit_code);
 
             return res;
@@ -159,10 +160,11 @@ class child
 
     void terminate(std::error_code & ec) noexcept
     {
-        if (valid() && running(ec))
+        if (valid() && running(ec) && !ec)
             boost::process::detail::api::terminate(_child_handle, ec);
 
-        _terminated = true;
+        if (!ec)
+            _terminated = true;
     }
 
     void wait(std::error_code & ec) noexcept
@@ -171,7 +173,8 @@ class child
         {
             int exit_code = 0;
             boost::process::detail::api::wait(_child_handle, exit_code, ec);
-            _exit_status->store(exit_code);
+            if (!ec)
+                _exit_status->store(exit_code);
         }
     }
 
@@ -188,7 +191,7 @@ class child
         {
             int exit_code = 0;
             auto b = boost::process::detail::api::wait_until(_child_handle, exit_code, timeout_time, ec);
-            if (!b)
+            if (!b || ec)
                 return false;
             _exit_status->store(exit_code);
         }