Function: _def_debugfiles
Class: default
Section: default
C-Name: sd_debugfiles
Obsolete: 2021-06-14
Prototype:
Help:
Doc: This is a deprecated alias for \kbd{setdebug("io",)}. If nonzero,
 \kbd{gp} will print information on file descriptors in use and I/O
 operations (see~\b{gf}).

 The default value is \kbd{0} (no debugging messages).
