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Tcl_CreateFileHandler(3tcl) on Linux

The text 0122ed4e1caa, as Debian 3.1 (Sarge), Debian 3.0 (Woody), Debian 2.2 (Potato), Debian 2.1 (Slink) shipped it.

associate procedure callbacks with files or devices (Unix only)

Tcl_CreateFileHandler(3tcl) on Linux now