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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 the QNX OS 8.0.
Utilities & Libraries
Utilities Reference
L
ldd
List the shared objects that a program requires (Unix)

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.
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- 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
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  - 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
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    - Utility Conventions
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      - ld
        Linker command (POSIX)
      - ldd
        List the shared objects that a program requires (Unix)
      - less
        Display files on a page-by-page basis (UNIX)
      - libcam.so
        Common access methods support
      - link
        Create a hard link to a file (POSIX, toybox)
      - ln (host)
        Create links to (aliases for) files (POSIX)
      - ln (target)
        Create links to (aliases for) files (POSIX, toybox)
      - ln-w
        Create a link on Windows
      - logname
        Prints the current username (POSIX, toybox).
      - logger
        Make entries in the system log (POSIX)
      - login
        Log in
      - logout
        Terminate a session (UNIX)
      - ls (host)
        List directory contents (POSIX)
      - ls (target)
        List directory contents (POSIX, toybox)
      - lzcat, lzma
        Compress or decompress .lzma files
      - lzmadec
        Small .lzma decompressor
      - lzmainfo
        Show information stored in the .lzma file header
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    - 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^® Operating System (OS) applications and systems.
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.

ldd

QNX SDP8.0Utilities ReferenceUtilities

List the shared objects that a program requires (Unix)

Syntax:

ldd program ...

Runs on:

QNX OS

Options:

None.

Description:

The ldd (list dynamic dependencies) command lists the shared objects that the specified programs require. If you don't specify the full path for a program, ldd looks for it in your current directory.

You can use this utility to determine which shared objects to include in an OS image; see the OS Image Buildfiles chapter of Building Embedded Systems.

Note:

It's worth noting that ldd is also the name of the runtime linker. In the ELF .interp section, it's called /usr/lib/ldqnx-64.so.

Examples:

Run ldd in the directory where the program is located:

$ cd /bin
$ ldd ls
./ls:
        libc.so.6 => /proc/boot/libc.so.6 (0x19dbd08000)

Run ldd using which to resolve the path to the program:

$ ldd `which ksh`
/proc/boot/ksh:
        libc.so.6 => /proc/boot/libc.so.6 (0xb65a48000)
$ ldd `which ntpdate`
/base/usr/sbin/ntpdate:
        libsocket.so.3 => /proc/boot/libsocket.so.3 (0x38c468000)
        libm.so.3 => /proc/boot/libm.so.3 (0x38c6aa000)
        libcrypto.so.2.1 => /proc/boot/libcrypto.so.2.1 (0x38c8e0000)
        libintl.so.1 => /usr/lib/libintl.so.1 (0x38ce26000)
        libc.so.6 => /proc/boot/libc.so.6 (0x38d036000)
        libiconv.so.1 => /usr/lib/libiconv.so.1 (0x38d2f0000)

Environment variables:

DL_DEBUG: If this environment variable is set, the shared library loader displays debugging information about the libraries as they're opened.

Page updated: August 09, 2024