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
TC*
TCSETS, TCSETSF, TCSETSW
Set terminal properties from a termios structure

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_CAM_*
    - 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*
      - TCFLSH
        Flush buffers
      - TCGETA
        Get the terminal properties in a termio structure
      - TCGETS
        Get the terminal properties in a termios structure
      - TCSBRK
        Assert a break condition over a communications line
      - TCSETA, TCSETAF, TCSETAW
        Set terminal properties from a termio structure
      - TCSETS, TCSETSF, TCSETSW
        Set terminal properties from a termios structure
      - TCXONC
        Perform a flow-control operation on a data stream
    - TIOC*
  - 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
  - QNX Cryptography Library
    The QNX Cryptography Library (qcrypto) is a flexible cryptography framework that allows you to choose which cryptography provider responds to requests on a per-process basis.
  - QNX devcrypto Service
  - 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.

TCSETS, TCSETSF, TCSETSW

QNX SDP8.0Devctl and Ioctl CommandsDeveloper

Set terminal properties from a termios structure

Synopsis:

#include <sys/ioctl.h>

#define TCSETS          _IOW('T', 14, struct termios)
#define TCSETSW         _IOW('T', 15, struct termios)
#define TCSETSF         _IOW('T', 16, struct termios)

Arguments to ioctl():


Argument	Value
`fd`	A file descriptor that you obtained by opening the device
`request`	TCSETS, TCSETSF, or TCSETSW
Additional argument	A pointer to a struct termios

Description:

These commands change the current terminal control settings of a device:

TCSETS — make the change immediately
TCSETSF — Don't make the change until all currently written data has been transmitted, at which point any received but unread data is also discarded.
TCSETSW — don't make the change until all currently written data has been transmitted.

They're similar to the following ioctl() commands:


TC* command	TIOC* command
TCSETS	TIOCSETA
TCSETSF	TIOCSETAF
TCSETSW	TIOCSETAW

Note:

These commands are for internal use, and you shouldn't use them directly. Instead use the tcsetattr() cover function.

The TCSETA, TCSETAF, and TCSETAW ioctl() commands are similar, but they use a struct termio instead of a struct termios.

Input:

A termios structure.

Output:

None.

See also:

TCGETS, TCSETA, TCSETAF, TCSETAW, TIOCSETA, TIOCSETAF, TIOCSETAW

ioctl(), termios in the QNX OS C Library Reference

Page updated: August 11, 2025