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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.
Utilities & Libraries
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.
Message destinations
Log flags that specify log message destinations.

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
- 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
  - C Library Reference
  - Devctl and Ioctl Commands
  - JSON Library Reference
  - PAM Reference
  - 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.
  - SPI Framework Technote
  - Utilities Reference
  - WPA Control Interface Reference
    This document provides a reference for the Wi-Fi Protected Access (WPA) control interface, which provides a C API for the WPA/IEEE 802.11i protocols in Wi-Fi client stations. Application developers who want to control WPA operations and get associated status and event data should read this reference.
- 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.

Message destinations

QNX SDP8.0QNX Helpers Developer's GuideAPIDeveloper

Log flags that specify log message destinations.

Definitions:

#define QH_LOG_DEST_STDOUT

#define QH_LOG_DEST_STDERR

#define QH_LOG_DEST_SLOG

#define QH_LOG_DEST_SLOG2

Page updated: March 05, 2025