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
DCMD_F3S_*
DCMD_F3S_SETCMP
Set compresssion on for a flash filesystem

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_F3S_ARRAYINFO
        Get the total amount of contiguous flash
      - DCMD_F3S_CLRCMP
        Set compresssion off for a flash filesystem
      - DCMD_F3S_ERASE
        Erase sectors in a raw flash filesystem partition
      - DCMD_F3S_EXIT
        Exit the driver
      - DCMD_F3S_FORMAT
        Format a flash filesystem
      - DCMD_F3S_GEOINFO
        Get the flash geometry
      - DCMD_F3S_GETCMP
        Get the compresssion setting for a flash filesystem
      - DCMD_F3S_LOCKSSR
        Lock a secure silicon region
      - DCMD_F3S_LOCK
        Lock a partition
      - DCMD_F3S_MOUNT
        Mount a flash filesystem partition
      - DCMD_F3S_PARTINFO
        Get information about a partition
      - DCMD_F3S_READSSR
        Read data from the secure silicon region
      - DCMD_F3S_RECLAIMCTL
        Provide runtime control of reclaims
      - DCMD_F3S_RECLAIM
        Reclaim deleted blocks
      - DCMD_F3S_SETCMP
        Set compresssion on for a flash filesystem
      - DCMD_F3S_STATSSR
        Get the lock status of a secure silicon region
      - DCMD_F3S_UMOUNT
        Unmount a flash filesystem partition
      - DCMD_F3S_UNITINFO
        Get information about a unit (erase sector)
      - DCMD_F3S_UNLOCKALL
        Unlock all flash filesystem partitions
      - DCMD_F3S_UNLOCK
        Unlock a flash filesystem partition
      - DCMD_F3S_WRITESSR
        Write data to the secure silicon region
    - 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*
  - 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.

DCMD_F3S_SETCMP

QNX SDP8.0Devctl and Ioctl CommandsDeveloper

Set compresssion on for a flash filesystem

Synopsis:

#include <sys/dcmd_f3s.h>

#define DCMD_F3S_SETCMP    __DIOT(_DCMD_F3S, F3S_SETCMP, f3s_cmdcmp_t)

Arguments to devctl():


Argument	Value
`filedes`	A file descriptor that you obtained by opening the device.
`dcmd`	DCMD_F3S_SETCMP
`dev_data_ptr`	A pointer to a f3s_cmdcmp_t structure (see below)
`n_bytes`	`sizeof(f3s_cmdcmp_t)`
`dev_info_ptr`	NULL

Description:

This command sets compression on for a flash filesystem.

Input:

A pointer to a f3s_cmdcmp_t structure:

typedef struct f3s_cmdcmp_s
{
  uint32_t status;    /* cmdcmp status */
  uint32_t cmp_flag;  /* compression flag */
}
f3s_cmdcmp_t;

The input isn't actually used.

Output:

None.