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C Library Reference

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QNX Advanced Virtualization Frameworks User's Guide
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Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation and explains how to obtain technical support.

About This Reference

The C Library Reference describes the C functions, data types, and protocols that are included as part of the QNX Neutrino RTOS.


For information about:	See:
Specific entries	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
An overview of what you'll find in each entry	What's in a Function Description?
Descriptions of the manifests that you can use for compile-time changes or inspection	Manifests
Describes the character sets and C standard environment macros that QNX Neutrino supports.	Character Sets
Complete safety information	Full Safety Information
Terms used in QNX Neutrino documentation	Glossary

Note:

Some entries in this document refer to undefined behavior. In some cases, such behavior is caused by programming errors (e.g., using conflicting flags) and could cause harm (e.g., memory corruption, the failure of threads to run); in other cases, it consists of implementation details that we don't guarantee and that could change (e.g., the order in which certain things happen). Don't rely on any behavior that you observe in these situations.
Some functions return specific values (e.g., -1) to indicate that an error occurred, but aren't documented as returning specific values for success. You can interpret any other value as success, but don't make any assumptions about specific values. For example, MsgReply() is documented as returning -1 if an error occurred; don't assume that it returns 0 to indicate success. See also Returns in the What's in a Function Description? chapter.

For information about programming in QNX Neutrino, see Getting Started with QNX Neutrino and the QNX Neutrino Programmer's Guide.

For information about licensing, see Licensing information in Typographical Conventions, Support, and Licensing.

Page updated: March 12, 2026