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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 QNX Neutrino 7.1.
Utilities & Libraries
Devctl and Ioctl Commands
DCMD_ETFS_*

QNX Momentics IDE User's Guide
This User's Guide describes version 7.1 of the Integrated Development Environment (IDE) that's part of the QNX Momentics 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 QNX Neutrino 7.1.
- Quickstart Guide
- OS Components & Operations
- Audio & Graphics API
- Multimedia
- Networking Middleware
- Programming
- Sensor Framework
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX Neutrino RTOS system and developers who want to create a QNX Neutrino resource manager free from vulnerabilities.
- Utilities & Libraries
  - Addon Interfaces Library Reference
  - C Library Reference
  - Devctl and Ioctl Commands
    - BIOC* (io-sock)
    - CAN_DEVCTL_*
    - DCMD_ALL_*
    - DCMD_BLK_*
    - DCMD_BT_*
    - DCMD_CHR_*
    - DCMD_DUMPER_*
    - DCMD_ETFS_*
      - DCMD_ETFS_DEFRAG
        Defragment an embedded transaction filesystem
      - DCMD_ETFS_ERASE
        Erase an embedded transaction filesystem
      - DCMD_ETFS_ERASE_RANGE
        Erase a specified range in an embedded transaction filesystem
      - DCMD_ETFS_FLUSH_COUNT
        Flush the .badblks and .counts files for an embedded transaction filesystem
      - DCMD_ETFS_FORMAT
        Format an embedded transaction filesystem
      - DCMD_ETFS_INFO
        Get information about an embedded transaction filesystem
      - DCMD_ETFS_START
        Start an embedded transaction filesystem
      - DCMD_ETFS_STOP
        Stop an embedded transaction filesystem
    - DCMD_F3S_*
    - DCMD_FSEVMGR_*
    - DCMD_FSYS_*
    - DCMD_IP_*
    - DCMD_MEMMGR_*
    - DCMD_MISC_*
    - DCMD_MMCSD_*
    - DCMD_PROC_*
    - DCMD_PROF_*
    - DCMD_PTPD_*
    - DCMD_SDIO_*
    - DCMD_SDMMC_*
    - DCMD_SPI_*
    - FIO*
    - TC*
    - TIOC*
  - 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.
QNX Hypervisor
The QNX Hypervisor allows you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX software in Amazon Web Services (AWS) and Microsoft Azure (Azure).
QNX Advanced Virtualization Frameworks User's Guide
This User's Guide is aimed at all systems integrators and developers who want to design and build embedded systems using the QNX Advanced Virtualization Frameworks.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation and explains how to obtain technical support.

DCMD_ETFS_*

This chapter describes the devctl() commands that apply to embedded transaction filesystems. For more information about ETFS, see Embedded transaction filesystem (ETFS) in the Filesystems chapter of the System Architecture guide, and the entries for fs-etfs-ram and etfsctl in the Utilities Reference.

Note:

Some of these commands require a file descriptor that corresponds to the filesystem partition, /dev/etfs2, not to the raw partition, /dev/etfs1.

Page updated: March 12, 2026