XtAppAddBlockHook(3x) on Linux
The text 7381e859ce68, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.
register a block hook procedure
The text 7381e859ce68, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.
register a block hook procedure