OS : SunOS 5.8
Machine: Sun Solaris
I had an error while executing close command. But
there was not posix error message. The error message
contained only stack trace information.
I could not find any Tcl_AppendResult in
Tcl_CloseObjCmd, Tcl_UnregisterChannel and Tcl_Close.
And I think Tcl_InterpObjCmd and Tcl_ExecObjCmd also
will be same.