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
  - Devctl and Ioctl Commands
  - JSON Library Reference
  - PAM Reference
  - Utilities Reference
    - Utility Conventions
    - A
    - B
    - C
    - D
    - E
    - F
      - false (host)
        Return false value (POSIX)
      - false (target)
        Return false value (POSIX, toybox)
      - fcat
        Display compressed (frozen) files (UNIX)
      - fdisk
        Create and manage partitions on a hard disk
      - fesh
        Fat embedded shell (QNX OS)
      - fgrep (host)
        Fixed string grep (UNIX)
      - fgrep (target)
        Fixed string grep (POSIX, toybox)
      - file
        Determine file type (POSIX, toybox)
      - find (host)
        Find files (POSIX)
      - find (target)
        Find files (POSIX, toybox)
      - flashctl
        Manage a flash filesystem
      - flex
        Generate programs for lexical tasks
      - fmt
        Format concatenated input (POSIX, toybox)
      - fold
        Fold lines (POSIX)
      - freeze
        Compress and uncompress files (UNIX)
      - fs-dos.so
        DOS filesystem (QNX OS)
      - fs-ext2.so
        Linux Ext2 filesystem
      - fs-nfs3
        NFS 3 client filesystem (QNX OS)
      - fs-qcfs.so
        Shared object that supports the QNX compressed filesystem (QCFS)
      - fs-qnx6.so
        Shared object that supports the Power-Safe filesystem (QNX OS)
      - fs-qtd.so
        Shared object that supports the QNX Trusted Disk feature (QNX OS)
      - fs-squash.so
        Shared object that supports Linux Squash filesystem (QNX OS)
      - fs-udf.so
        Universal Disk Format and ISO 9660 filesystem support
      - fsencrypt
        Filesystem encryption manager
      - fsevmgr
        Filesystem event manager
      - fsysinfo
        Display filesystem statistics (QNX OS)
      - /etc/fstab
        File for predefined mountpoints
      - fullpath
        Display network-qualified pathnames (QNX)
      - fuser
        List the process IDs of all processes that have one or more files open (POSIX)
    - G
    - H
    - I
    - J
    - K
    - L
    - M
    - N
    - O
    - P
    - Q
    - R
    - S
    - T
    - U
    - V
    - W
    - X
    - Y
    - Z
    - Commonly Used Environment Variables
    - Selecting the Target System
    - Glossary
  - 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.

fs-ext2.so

QNX SDP8.0Utilities ReferenceUtilities

Linux Ext2 filesystem

Syntax:

driver ... ext2 ext2_options ... &

where driver is one of the devb-* drivers.

Runs on:

QNX OS

Options:

unfixbadver: Turn off workarounds for corrupt volumes created by the buggy 1.19 version of mke2fs.
prealloc: Enable file preallocation methods to improve file write performance.
Warning: In case of an unclean shutdown, there is a possibility of leaked blocks. Use the checker utility e2fsck to recover such blocks.

Description:

The Ext2 filesystem (fs-ext2.so) provides transparent access to Linux disk partitions. This implementation supports the standard set of features found in Ext2 versions 0 and 1.

Sparse file support is included in order to be compatible with existing Linux partitions. Other filesystems can only be stacked read-only on top of sparse files. There are no such restrictions on normal files.

If an Ext2 filesystem isn't unmounted properly, a filesystem checker is usually responsible for cleaning up the next time the filesystem is mounted. Although the fs-ext2.so module is equipped to perform a quick test, it automatically mounts the filesystem as read-only if it detects any significant problems (which should be fixed using a filesystem checker).

The following features are not currently supported:

dirty ext3 journal
compression
encryption
extents
64 bit block addressing (very large filesystems)

The following features allow for a filesystem to be mounted as read-only:

huge files
quotas
bigalloc

Note: This filesystem uses UTF-8 encoding for presentation of its filenames; attempts to specify a filename not using UTF-8 encoding will fail (with an error of EILSEQ).

For details on filesystems that QNX OS supports, including their drivers and tool set, see the Filesystems chapter of the System Architecture guide.

Caveats:

Although Ext2 is the main filesystem for Linux systems, we don't recommend using fs-ext2.so as a replacement for the Power-Safe (fs-qnx6.so) filesystem. Currently, we don't support booting from Ext2 partitions. Also, the Ext2 filesystem relies heavily on its filesystem checker to maintain integrity; this and other support utilities (e.g., mke2fs) are available as part of a separate, optional package in the QNX SDP. Please contact QNX support if you need access to these tools.

Page updated: May 17, 2024