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Client APIs and toolsYou can use the HCL Informix® implementation of client APIs to develop applications for Informix® database servers.
ESQL/C GuideThe Informix® ESQL/C Programmer's Manual explains how to use Informix® ESQL/C, the Informix® implementation of Embedded Structured Query Language (SQL) for C (ESQL/C), to create client applications with database-management capabilities.
Database server communication
Informix® librariesThese topics describe how to link the static, shared, and thread-safe HCL Informix® general libraries with your Informix® ESQL/C application.
Create thread-safe ESQL/C applications
Program a thread-safe ESQL/C applicationThis section provides useful hints for how to create thread-safe Informix® ESQL/C applications.
Environment variables across threadsEnvironment variables are not thread-scoped in a thread-safe Informix® ESQL/C application. That is, if a thread changes the value of a particular environment variable, this change is visible in all other threads as well.

Environment variables across threads

Environment variables are not thread-scoped in a thread-safe Informix® ESQL/C application. That is, if a thread changes the value of a particular environment variable, this change is visible in all other threads as well.

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