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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.
error.h
QNX helpers - Helpers related to the errno variable.
qh_set_errno()
Set errno

QNX Momentics IDE User's Guide
QNX Software Development Platform
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- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
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  - Boot Optimization Guide
    The Boot Optimization Guide describes techniques you can use to reduce the time from your board's initial power on until you have a fully functional QNX system running on the board.
  - Building Embedded Systems
    The Building Embedded Systems guide is intended for developers who are developing or building BSPs for QNX OS embedded systems.
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    While QNX provides Board Support Packages (BSPs) for many common platforms and their individual variants, in some cases, you need a BSP for a board that QNX does not provide. If this is the case, you can modify a QNX BSP or develop your own.
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    This guide contains instructions for implementing and using the QNX OS High-Performance Networking Stack and its manager, io-sock.
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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.
    - attr.h
      QNX helpers - Attribute helpers.
    - endian.h
      QNX helpers - Endianness-related helpers.
    - error.h
      QNX helpers - Helpers related to the errno variable.
      - Macros
        These macros are related to errno handling.
      - qh_abort_on_errno()
        Conditionally log an error message using QNX helpers logging functions and then call abort() if the specified errno is not EOK
      - qh_set_errno()
        Set errno
      - qh_set_errno_on_error()
        Conditionally set errno
      - qh_sticky_error()
        Store a new error code as a variable if the new error is not zero and the previously stored one is
      - qh_sticky_error_last()
        Store a new error code as a variable if the new error is not zero
      - qh_strerror()
        Convert an error number into an error message and guarantee that errno is kept intact in the process
    - io.h
      QNX helpers - IO helpers.
    - log.h
      QNX helpers related to logging.
    - misc.h
      QNX helpers - Miscellaneous helpers.
    - qh.h
      QNX helpers that set QH_FILENAME.
    - size.h
      QNX helpers - Size-related helpers.
    - string.h
      QNX helpers - Helpers related to strings and string conversions.
    - time.h
      QNX helpers - Helpers related to time.
  - SMMUMAN User's Guide
  - SPI Framework Technote
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  - User's Guide
    The QNX OS User's Guide is intended for all users of a QNX OS system, from system administrators to end users.
- Graphics
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  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
- 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.

qh_set_errno()

QNX SDP8.0QNX Helpers Developer's GuideAPIDeveloper

Set errno

Synopsis:

#include <qh/error.h>

static errno_t qh_set_errno(const errno_t errval)

Arguments:

errval: The standard errno to set errno to.

Library:

Description:

This function sets errno to the error value specified by errval and returns the value of errval.

Returns:

The value of errval.

Page updated: May 17, 2024