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udev

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udev

Author

O.S. Systems, maintained by Mario Domenech Goulart

[procedure] udev-device?
[procedure] udev-device-node
[procedure] udev-device-type
[procedure] udev-device-subsystem
[procedure] udev-device-action
[procedure] udev-device-syspath
[procedure] udev-device-sysname
[procedure] udev-device-sysnum
[procedure] udev-device-driver
[procedure] udev-device-properties

Accessors for udev-device records.

Listing devices

[procedure] (udev-list-devices)

Return a list of devices identified by udev, represented by udev-device records.

Monitoring

[procedure] (udev-monitor-start dispatcher #!key (polling-interval 0.2))

Start the udev monitor thread. dispatcher is a one-argument procedure that is is given an udev-device record for each udev event.

This procedure creates an srfi-18 thread which polls udev in polling-interval seconds.

[procedure] (udev-monitor-stop! monitor)

Stop the udev monitor thread.

Example:

(use udev)

(define (mountable-device? dev)
  (and (equal? (udev-device-type dev) "partition")
       (equal? (udev-device-subsystem dev) "block")))

(define (dispatcher dev)
  (let ((node (udev-device-node dev))
        (action (udev-device-action dev)))
    (when (mountable-device? dev)
      (cond ((equal? action "add")
             (print "Mounting " node))
            ((equal? action "remove")
             (print "Unmounting " node))))))

(thread-join! (udev-monitor-start dispatcher))

Miscellaneous

[procedure] (udev-device-parent-with-subsystem-devtype dev subsystem devtype)

Find the next parent device, with a matching subsystem and devtype value, and fill in information from the sys device and the udev database entry (from the original documentation).

dev is an udev-device record. subsystem and devtype are strings. Returns a udev-device record.

[procedure] (make-udev-device node subsystem type action syspath sysname sysnum driver properties)

Create a udev-device record. This procedure is usually only useful for mocking udev devices.

License

 Copyright (c) 2014, O.S. Systems Software LTDA
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
 3. The name of the authors may not be used to endorse or promote products
    derived from this software without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Version history

Version 0.0.1

Initial release