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QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
OS Components & Operations
Device Publishers Developer's Guide
The USB Launcher Service
The USB launcher service (usblauncher_otg) processes USB device attachments and detachments, launches drivers for communicating with devices, and publishes device information through RMPS. The service can also force a re-enumeration of a device, by resetting it or by requesting it to disconnect and change its personality.
Driver object

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
- Quickstart Guide
- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
- OS Components & Operations
  - Boot Optimization Guide
    The Boot Optimization Guide describes techniques you can use to reduce the time from your board's initial power on until you have a fully functional QNX system running on the board.
  - Building Embedded Systems
    The Building Embedded Systems guide is intended for developers who are developing or building BSPs for QNX OS embedded systems.
  - Customizing a BSP
    While QNX provides Board Support Packages (BSPs) for many common platforms and their individual variants, in some cases, you need a BSP for a board that QNX does not provide. If this is the case, you can modify a QNX BSP or develop your own.
  - Device Publishers Developer's Guide
    - Device Publishers
      Device publishers are hardware-support components that publish information about attached devices. The QNX OS ships the usblauncher_otg publisher for USB-connected devices. This publisher sends information through its embedded resource manager publisher (RMPS) component. Applications use this information to access the content on devices, which allows them to display file information in browsers or to use multimedia services to read and play media files from those devices.
    - The USB Launcher Service
      The USB launcher service (usblauncher_otg) processes USB device attachments and detachments, launches drivers for communicating with devices, and publishes device information through RMPS. The service can also force a re-enumeration of a device, by resetting it or by requesting it to disconnect and change its personality.
      - Command line for USB launcher service (usblauncher_otg)
        Start usblauncher_otg device enumerator and publisher
      - Device control object
      - Device information object
      - Driver object
      - Mount object
      - Mounting USB filesystems
        If you use the USB launcher service for device publishing, you can configure it to mount the filesystems of USB devices. That way, you don't need to use a separate service to do the mounting (unless you also need to mount non-USB devices).
      - Configuration files
        The USB launcher service configuration files contain instructions for processing attached devices based on their properties, as well as descriptors to expose to USB hosts when the USB server is running in device mode.
      - USB hubs
        You can configure the USB launcher service to process hubs when they're attached, by defining a matching rule for the USB_CLASS_HUB class.
      - Supported third-party applications and protocols
        The USB launcher service supports third-party applications and protocols used by a variety of devices. To work with these devices, the service can probe them for protocol support and request that they switch to another personality.
  - High Availability Framework Developer's Guide
  - High-Performance Networking Stack (io-sock) User's Guide
    This guide contains instructions for implementing and using the QNX OS High-Performance Networking Stack and its manager, io-sock.
  - PCI Server User's Guide
  - Performance Tuning User's Guide
  - SMMUMAN User's Guide
  - System Analysis Toolkit (SAT) User's Guide
  - Technotes
  - User's Guide
    The QNX OS User's Guide is intended for all users of a QNX OS system, from system administrators to end users.
- Graphics
- Programming
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX OS system and developers who want to create a QNX OS resource manager free from vulnerabilities.
- Utilities & Libraries
- Migrating to QNX OS 8.0
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX OS in the Amazon cloud environment.
QNX Toolkit for Visual Studio Code
This User's Guide describes the QNX^® Toolkit for Visual Studio Code. The guide introduces you to the QNX Toolkit by explaining the QNX development environment and how to build, run, and debug your QNX^® Operating System (OS) applications and systems.
QNX Hypervisor User's Guide
This User's Guide explains the QNX hypervisor architecture and provides instructions for installing and running a QNX Hypervisor system, changing system components and configuration, and using hypervisor features such as virtual devices (vdevs).
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

Driver object

QNX SDP8.0Device Publishers Developer's GuideAPIArchitecture

USB driver objects have names that match the driver process IDs. This approach ensures the distinctiveness of object names for different USB devices because process IDs are unique throughout the system.

Each driver object that the USB launcher service writes to RMPS contains the following fields:


Name	Description	Type	Example
arguments	Command-line arguments passed to the driver for the device	String	blk cache=1m,vnode=384, auto=none,delwri=2:2,rmvto=none, noatime disk name=umass cdrom name=umasscd umass path=/dev/usb/io-usb-otg, priority=21,vid=0xfca, did=0x8004,busno=0,devno=0x2, iface=0x1,ign_remove
interface	USB interface number	Integer	1
interface_class	USB class ID	Integer	0x08
interface_name	USB interface name. This field is present only if the device defines it.	String	Mass Storage Device
interface_protocol	USB interface protocol	Integer	0x50
interface_subclass	USB subclass ID	Integer	0x06
name	Driver process name	String	devb-umass
pid	Driver process ID	Integer	593947
RMPS_DEVICE_ID	Device information object path	String	/usb/launcher/usb-0.2

Page updated: March 05, 2025