install_plugins_pre_upload action-hook . WP 1.0

This action is documented in wp-admin/plugin-install.php

Usage

add_action( 'install_plugins_pre_upload', 'action_function_name_9857' );
function action_function_name_9857(){
	// action...
}

Where the hook is called

do_action( 'install_plugins_pre_upload' );

Where in WP core the hook is used WordPress