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
- 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
    - What's in a Function Description?
    - Manifests
    - Character Sets
    - A
    - B
    - C
    - D
      - daemon()
        Run a process in the background
      - daylight
        Indicator of support for daylight saving time in the locale
      - DebugBreak()
        Enter the process debugger
      - DebugKDBreak()
        Enter the kernel debugger
      - DebugKDOutput()
        Print text with the kernel debugger
      - delay()
        Suspend a calling thread for a given length of time
      - devctl(),devctlv()
        Control a device
      - difftime()
        Calculate the difference between two times
      - dircntl()
        Control an open directory
      - dirent, dirent64
        Data structure for a directory entry
      - dirfd()
        Extract the file descriptor for a DIR stream
      - dirname()
        Find the parent directory part of a file pathname
      - dispatch_block()
        Block while waiting for an event
      - dispatch_context_alloc()
        Return a dispatch context
      - dispatch_context_free()
        Free a dispatch context
      - dispatch_create()
        Allocate a dispatch structure and create the channel associated with it
      - dispatch_create_channel()
        Allocate a dispatch structure, specifying a channel ID
      - dispatch_destroy()
        Destroy a dispatch handle, without cleaning up the dispatch framework
      - dispatch_handler()
        Handle events received by dispatch_block()
      - dispatch_timeout()
        Set a timeout
      - dispatch_unblock()
        Unblock a thread that is blocked on a dispatch handle
      - div()
        Calculate a quotient and remainder
      - dl_iterate_phdr()
        Iterate over the shared objects that are loaded into a process's address space
      - dladdr()
        Translate an address to symbolic information
      - dlclose()
        Close a shared object
      - dlerror()
        Get dynamic loading diagnostic information
      - dlopen()
        Open a shared library
      - dlsym()
        Get the address of a symbol in a shared object
      - dprintf()
        Write output to a file associated with a file descriptor
      - drand48()
        Generate a pseudo-random double
      - dup()
        Duplicate a file descriptor
      - dup2()
        Duplicate a file descriptor, specifying the new descriptor
      - dupfd()
        Duplicate a file descriptor from another process
      - dupfd_getinfo()
        Fetch the information registered by calling dupfd_register()
      - dupfd_register()
        Register a file descriptor to be duplicated by another process
      - dupfd_unregister()
        Unregister a handle that was returned by a call to dupfd_register()
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    - Full Safety Information
    - Glossary
  - Devctl and Ioctl Commands
  - JSON Library Reference
  - PAM Reference
  - 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 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.

DebugKDOutput()

QNX SDP8.0C Library ReferenceAPIDeveloper

Print text with the kernel debugger

Synopsis:

#include <sys/neutrino.h>

void DebugKDOutput( const char* str,
                    size_t size );

Arguments:

str: The string that you want to print.
size: The number of characters to print.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The DebugKDBreak() kernel call causes the kernel debugger to print size characters from str if the kernel debugger is present in your boot image. If it isn't in your boot image, nothing happens.

When, where, and how the kernel debugger displays this message depends on which host debugger you're using.

Blocking states

None.

Classification:

QNX OS


Safety:
Cancellation point	No
Signal handler	Yes
Thread	Yes

Page updated: May 17, 2024