modules/udev: Add module comments

* modules/udev/device.scm, modules/udev/hwdb.scm, modules/udev/monitor.scm,
  modules/udev/udev.scm: Add module commentary.

modules/udev/device.scm

@@ -1,3 +1,31 @@
+;;; device.scm -- Udev device procedures.
+;;
+;; Copyright (C) 2020-2023 Artyom V. Poptsov <[email protected]>
+;; Copyright (C) 2023 Maxim Cournoyer <[email protected]>
+;;
+;; This file is part of Guile-Udev.
+;;
+;; Guile-Udev is free software: you can redistribute it and/or modify it under
+;; the terms of the GNU General Public License as published by the Free
+;; Software Foundation, either version 3 of the License, or (at your option)
+;; any later version.
+;;
+;; Guile-Udev is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+;; more details.
+;;
+;; You should have received a copy of the GNU General Public License along
+;; with Guile-Udev. If not, see <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+
+;; This module contains procedures for working with Udev devices.
+
+
+;;; Code:
+
 (define-module (udev device)
   #:export (udev-device
 	    udev-device?
@@ -13,4 +41,8 @@
             udev-device-get-properties
             udev-device-get-tags))
 
+
 (load-extension "libguile-udev" "init_udev_device")
+
+;;; device.scm ends here.
+

modules/udev/hwdb.scm

@@ -1,7 +1,39 @@
+;;; hwdb.scm -- Udev hardware database procedures.
+;;
+;; Copyright (C) 2020-2023 Artyom V. Poptsov <[email protected]>
+;;
+;; This file is part of Guile-Udev.
+;;
+;; Guile-Udev is free software: you can redistribute it and/or modify it under
+;; the terms of the GNU General Public License as published by the Free
+;; Software Foundation, either version 3 of the License, or (at your option)
+;; any later version.
+;;
+;; Guile-Udev is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+;; more details.
+;;
+;; You should have received a copy of the GNU General Public License along
+;; with Guile-Udev. If not, see <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+
+;; This module contains procedures for interacting with the Udev hardware
+;; database.
+
+
+;;; Code:
+
 (define-module (udev hwdb)
   #:export (udev-hwdb
 	    udev-hwdb?
             make-udev-hwdb
             udev-hwdb-lookup))
 
+
 (load-extension "libguile-udev" "init_udev_hwdb")
+
+;;; hwdb.scm ends here.
+

modules/udev/monitor.scm

@@ -1,3 +1,31 @@
+;;; monitor.scm -- Udev monitor procedures.
+;;
+;; Copyright (C) 2020-2023 Artyom V. Poptsov <[email protected]>
+;; Copyright (C) 2023 Maxim Cournoyer <[email protected]>
+;;
+;; This file is part of Guile-Udev.
+;;
+;; Guile-Udev is free software: you can redistribute it and/or modify it under
+;; the terms of the GNU General Public License as published by the Free
+;; Software Foundation, either version 3 of the License, or (at your option)
+;; any later version.
+;;
+;; Guile-Udev is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+;; more details.
+;;
+;; You should have received a copy of the GNU General Public License along
+;; with Guile-Udev. If not, see <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+
+;; This module contains procedures for working with Udev monitors.
+
+
+;;; Code:
+
 (define-module (udev monitor)
   #:export (udev-monitor
 	    udev-monitor?
@@ -12,6 +40,7 @@
 	    udev-monitor-stop-scanning!
             udev-monitor-get-udev))
 
+
 ;; A high-level procedure that creates a new udev monitor instance with the
 ;; specified parameters.
 (define* (make-udev-monitor udev
@@ -42,3 +71,5 @@ or #f to match any type."
     monitor))
 
 (load-extension "libguile-udev" "init_udev_monitor")
+
+;;; monitor.scm ends here.

modules/udev/udev.scm

@@ -1,6 +1,36 @@
+;;; udev.scm -- Udev procedures.
+;;
+;; Copyright (C) 2020-2023 Artyom V. Poptsov <[email protected]>
+;;
+;; This file is part of Guile-Udev.
+;;
+;; Guile-Udev is free software: you can redistribute it and/or modify it under
+;; the terms of the GNU General Public License as published by the Free
+;; Software Foundation, either version 3 of the License, or (at your option)
+;; any later version.
+;;
+;; Guile-Udev is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+;; more details.
+;;
+;; You should have received a copy of the GNU General Public License along
+;; with Guile-Udev. If not, see <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+
+;; This module contains procedures for working with Udev instances.
+
+
+;;; Code:
+
 (define-module (udev udev)
   #:export (udev
 	    udev?
 	    make-udev))
 
+
 (load-extension "libguile-udev" "init_udev")
+
+;;; udev.scm ends here.