Home
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.
log.h
QNX helpers related to logging.
Macro variables
These macro definitions are used with QNX helpers logging macros and functions.

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.
      - Setting up QNX helpers logging
        QNX helpers logging provides default settings and configuration that initialize slog2.
      - Controlling QNX helpers logging
        Logging using QNX helpers is controlled by a configuration string that specifies a combination of the destination flags, the verbosity of a context, and the message-specific flags.
      - Macros
        These macros are the preferred method for making log calls. They are simplified versions of the QNX helpers logging functions.
      - Macro variables
        These macro definitions are used with QNX helpers logging macros and functions.
        Set of log destinations or no log destinations
        Identifiers that represent either a set of log destinations or no destinations.
        Blocked destinations
        Log flags that represent a log message destination that is blocked.
        Flags for converting destinations
        The size of the shift for converting from *_DEST_* defines and masks to *_NO_DEST_* ones, and vice versa.
        Log message output
        Optional flags used in a qh_log_*() call that modify the log message output.
        Log to stderr based on log level
        These convenience flags combine a log level and the stderr destination.
        Log to stderr or stdout based on log level
        These convenience flags combine a log level and the stdout and stderr destinations.
        Message destinations
        Log flags that specify log message destinations.
        Message with severity
        Convenience logging macros that implicitly specify the logging severity that is normally specified when calling the qh_log() or qh_log_noloc() macros.
        QH_LOG_USER_CONTEXT_VAR
        A variable that holds the name of the user QNX helpers logging context.
        Severity level masks
        A set of masks that represent the different sections of the severity level.
        User-reserved area
        A mask and shift size that represent the area of the flags that is reserved for users.
        Verbosity levels
        Identifiers that represent the verbosity levels when logging messages.
        Version numbers
      - qh_log_check()
        Check whether a message with the given log information structure is logged
      - qh_log_context_create()
        Create a logging context
      - qh_log_context_destroy()
        Destroys a logging context
      - qh_log_context_normalize_name()
        Normalize a context name
      - qh_log_context_t
        The opaque context type used by QNX helpers logging functions
      - qh_log_ex()
        Log a formatted message
      - qh_log_get_destinations()
        Get the destinations a specified context uses
      - qh_log_get_destinations_by_name()
        Get logging destinations based on a context name
      - qh_log_get_verbosity()
        Get the verbosity for the specified combination of context and destinations
      - qh_log_get_verbosity_by_name()
        Get the verbosity for the specified combination of named context and destinations
      - qh_log_info_t
        The information structure used with QNX helpers logging functions
      - qh_log_set_cl_mode()
        Set the logging configuration to command line mode
      - qh_log_update_config()
        Update the logging configuration based on a configuration string
      - qh_log_verbosity_to_str()
        Get the string representation of the specified verbosity
      - qh_vlog_ex()
        Log a formatted message using a variable-argument list
    - misc.h
      QNX helpers - Miscellaneous helpers.
    - qh.h
      QNX helpers that set QH_FILENAME.
    - 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.

Macro variables

QNX SDP8.0QNX Helpers Developer's GuideAPIDeveloper

These macro definitions are used with QNX helpers logging macros and functions.

Page updated: May 17, 2024