error.hh: add additional constructor with explicit errno argument

1 files changed, 8 insertions, 2 deletions

diff --git a/src/libutil/error.hh b/src/libutil/error.hh
index a53e9802e..3d1479c54 100644
--- a/src/libutil/error.hh
+++ b/src/libutil/error.hh
@@ -204,13 +204,19 @@ public:
     int errNo;
 
     template<typename... Args>
-    SysError(const Args & ... args)
+    SysError(int errNo_, const Args & ... args)
         : Error("")
     {
-        errNo = errno;
+        errNo = errNo_;
         auto hf = hintfmt(args...);
         err.msg = hintfmt("%1%: %2%", normaltxt(hf.str()), strerror(errNo));
     }
+
+    template<typename... Args>
+    SysError(const Args & ... args)
+        : SysError(errno, args ...)
+    {
+    }
 };
 
 }