Home
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
Devctl and Ioctl Commands
TIOC*
TIOCCBRK
Clear the break bit

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
    - BIOC*
    - CAN_DEVCTL_*
    - DCMD_ALL_*
    - DCMD_BLK_*
    - DCMD_CHR_*
    - DCMD_DUMPER_*
    - DCMD_F3S_*
    - DCMD_FSYS_*
    - DCMD_IP_*
    - DCMD_MEMMGR_*
    - DCMD_MISC_*
    - DCMD_MMCSD_*
    - DCMD_PROC_*
    - DCMD_PROF_*
    - DCMD_PTPD_*
    - DCMD_SDIO_*
    - DCMD_SDMMC_*
    - DCMD_SPI_*
    - PTP_*
    - FIO*
    - TC*
    - TIOC*
      - TIOCCBRK
        Clear the break bit
      - TIOCCDTR
        Clear data terminal ready
      - TIOCDRAIN
        Wait until output has drained
      - TIOCEXCL, TIOCSINUSE
        Set exclusive use of a terminal
      - TIOCFLUSH
        Flush buffers
      - TIOCGETA
        Get the terminal properties in a termios structure
      - TIOCGETC
        Get a terminal's special characters
      - TIOCGETP
        Get a terminal's parameters
      - TIOCGLTC
        Get the local special characters
      - TIOCGETPGRP, TIOCGPGRP
        Get the process group ID associated with a device
      - TIOCGSIZE, TIOCGWINSZ
        Get the size of a character device
      - TIOCHPCL
        Hang up on last close
      - TIOCLGET
        Get the local modes
      - TIOCLSET
        Set the entire local mode word
      - TIOCMBIC
        Clear specific modem bits
      - TIOCMBIS
        Set specific modem bits
      - TIOCMGET
        Get all modem bits
      - TIOCMSET
        Set all modem bits
      - TIOCNOTTY
        Make a terminal not be the controlling terminal
      - TIOCNXCL
        Reset exclusive use of a terminal
      - TIOCOUTQ
        Get the output queue size
      - TIOCPKT
        Set or clear packet mode
      - TIOCSCTTY
        Make a terminal the controlling terminal
      - TIOCSDTR
        Set data terminal ready
      - TIOCSETA, TIOCSETAF, TIOCSETAW
        Set terminal properties from a termios structure
      - TIOCSETC
        Set a terminal's special characters
      - TIOCSETN, TIOCSETP
        Set a terminal's parameters
      - TIOCSLTC
        Set the local special characters
      - TIOCSETPGRP, TIOCSPGRP
        Set the process group ID associated with a device
      - TIOCSTART
        Start output
      - TIOCSTI
        Simulate terminal input
      - TIOCSTOP
        Stop output
      - TIOCSSIZE, TIOCSWINSZ
        Set the size of a character device
  - 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.
  - 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.

TIOCCBRK

QNX SDP8.0Devctl and Ioctl CommandsDeveloper

Clear the break bit

Synopsis:

#include <sys/ioctl.h>

#define TIOCCBRK        _IO('t', 122)

Arguments to ioctl():


Argument	Value
`fd`	A file descriptor that you obtained by opening the device
`request`	TIOCCBRK

Description:

This command clears the break bit. It's implemented as a call to tcgetattr() to get the current settings, followed by a call to tcsetattr() to clear BRKINT and set IGNBRK.

Note:

The TIOCSBRK command, which sets the break bit, isn't currently implemented.

Input:

None.

Output: