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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
C Library Reference
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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
    - What's in a Function Description?
    - Manifests
    - Character Sets
    - A
    - B
    - C
    - D
    - E
    - F
    - G
    - H
    - I
    - J
    - K
    - L
    - M
    - N
      - name_attach()
        Register a name in the pathname space and create a channel
      - name_close()
        Close a server connection that was opened by name_open()
      - name_detach()
        Remove a name from the namespace and destroy the channel
      - name_open()
        Open a name to connect to a server
      - nan(), nanf(), nanl()
        Return a quiet NaN
      - nanosleep()
        Suspend a thread until a timeout or signal occurs
      - nanospin()
        Busy-wait without thread blocking for a period of time
      - nanospin_calibrate()
        Calibrate before calling nanospin*()
      - nanospin_count()
        Busy-wait without blocking for a number of iterations
      - nanospin_ns()
        Busy-wait without blocking for a period of time
      - nanospin_ns_to_count()
        Convert a time in nanoseconds into a number of iterations
      - nap()
        Sleep for a given number of milliseconds
      - napms()
        Sleep for a given number of milliseconds
      - nbaconnect()
        Initiate a connection on a socket (nonblocking)
      - nbaconnect_result()
        Get the status of the previous call to nbaconnect()
      - ncurses
        Control a terminal's display
      - ND_NODE_CMP()
        Compare two node descriptors
      - nearbyint(), nearbyintf(), nearbyintl()
        Return a rounded integer value
      - netent
        Structure for information from the network database
      - netmgr_ndtostr()
        Convert a node descriptor into a string
      - netmgr_remote_nd()
        Get a node descriptor that's relative to a remote node
      - netmgr_strtond()
        Convert a string into a node descriptor
      - nextafter(), nextafterf(), nextafterl()
        Compute the next representable double-precision floating-point number
      - nexttoward(), nexttowardf(), nexttowardl()
        Compute the next representable floating-point number in a given direction
      - nftw(), nftw64()
        Walk a file tree
      - nice()
        Returns 0
      - nl_langinfo()
        Get information about the language or cultural area defined in the current locale
      - nrand48()
        Generate a pseudo-random nonnegative long integer in a thread-safe manner
      - nsec2timespec()
        Convert nanoseconds to a timespec structure
      - _NTO_TRACE_GET*(), _NTO_TRACE_SET*()
        Macros for working with the header of a trace event
      - nto_power_freq_reason
        Reasons for the change to the power frequency
      - nto_power_parameter
        Values for power-management characteristics
      - nto_power_parameter_type
        Power-management parameters to get or set
      - nto_power_range
        Values for load threshold and delay for changing CPU frequency (operating point)
      - ntohl()
        Convert a 32-bit value from network-byte order to host-byte order
      - ntohs()
        Convert a 16-bit value from network-byte order to host-byte order
    - O
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    - R
    - S
    - T
    - U
    - V
    - W
    - X
    - Y
    - Z
    - Full Safety Information
    - Glossary
  - Devctl and Ioctl Commands
  - 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.

N

The functions, macros, and data structures in the C library are described here in alphabetical order.

A ¦ B ¦ C ¦ D ¦ E ¦ F ¦ G ¦ H ¦ I ¦ J ¦ K ¦ L ¦ M ¦ N ¦ O ¦ P ¦ Q ¦ R ¦ S ¦ T ¦ U ¦ V ¦ W ¦ X ¦ Y ¦ Z

Note the following:

nice() has no effect in QNX Neutrino; use pthread_setschedparam() or SchedSet()

This chapter describes the API components whose names begin with N.

Page updated: March 12, 2026