Declare function prototypes

Informix® ESQL/C provides the sqlproto.h header file to declare function prototypes for all Informix® ESQL/C library functions. These function prototypes are required in the Informix® ESQL/C source file that you compile with an ANSI C compiler. By default, the esql command processor does not include function-prototype declarations. Having the processor include the ANSI-compliant function prototypes for the Informix® ESQL/C functions prevents an ANSI C compiler from generating warnings.

Because the sqlproto.h file does not contain any Informix® ESQL/C statements, you can include this file in either of the following ways:

• With the Informix® ESQL/C include preprocessor directive:

  EXEC SQL include sqlproto;

• With the C #include preprocessor directive:

  #include "sqlproto.h";