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QNX Software Development Platform
OS Components
QNX Helpers Developer's Guide
These libraries provide QNX helpers, including helpers that assist with logging, string conversion, and number and type sizes.
qh.h
QNX helpers that set QH_FILENAME.
Using qh.h
In most cases, you do not have to include qh.h because it is included by all other QNX helper headers.

QNX Momentics IDE User's Guide
QNX Software Development Platform
- Quickstart Guide
- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
- OS Components
  - 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.
  - 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
  - QNX Helpers Developer's Guide
    These libraries provide QNX helpers, including helpers that assist with logging, string conversion, and number and type sizes.
    - attr.h
      QNX helpers - Attribute helpers.
    - endian.h
      QNX helpers - Endianness-related helpers.
    - error.h
      QNX helpers - Helpers related to the errno variable.
    - io.h
      QNX helpers - IO helpers.
    - log.h
      QNX helpers related to logging.
    - misc.h
      QNX helpers - Miscellaneous helpers.
    - qh.h
      QNX helpers that set QH_FILENAME.
      - Using qh.h
        In most cases, you do not have to include qh.h because it is included by all other QNX helper headers.
      - Definitions in qh.h
        Preprocessor macro definitions for the qh.h header file in the qh library
    - size.h
      QNX helpers - Size-related helpers.
    - string.h
      QNX helpers - Helpers related to strings and string conversions.
    - time.h
      QNX helpers - Helpers related to time.
  - SMMUMAN User's Guide
  - SPI Framework Technote
  - 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 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 OS applications and systems.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation and explains how to obtain technical support.

Using qh.h

QNX SDP8.0QNX Helpers Developer's GuideAPIDeveloper

In most cases, you do not have to include qh.h because it is included by all other QNX helper headers.

After qh.h is included, QH_FILENAME is available to the source file and contains the filename specified by __FILE__. If you are using a GNU compiler, QH_FILENAME is FILE with the path removed and QH_FILENAME_HAS_FULLPATH is false; otherwise, QH_FILENAME is __FILE__ and QH_FILENAME_HAS_FULLPATH is true. (Note that qh.h doesn't include stdbool.h.) If QH_FILENAME_HAS_FULLPATH is false, QH_SHORT_FILENAME_DEFINED is defined.

Page updated: May 17, 2024