epicsExport.h File Reference

Exporting IOC objects. More...

#include <shareLib.h>

Include dependency graph for epicsExport.h:

Go to the source code of this file.

Macros
#define	epicsExportSharedSymbols
#define	EPICS_EXPORT_POBJ(typ, obj)   pvar_ ## typ ## _ ## obj
#define	EPICS_EXPORT_PFUNC(fun)   EPICS_EXPORT_POBJ(func, fun)
#define	epicsExportAddress(typ, obj)
	Declare an object for exporting. More...
#define	epicsExportRegistrar(fun)   epicsShareFunc REGISTRAR EPICS_EXPORT_PFUNC(fun) = (REGISTRAR) &fun
	Declare a registrar function for exporting. More...
#define	epicsRegisterFunction(fun)
	Declare and register a function for exporting. More...

Typedefs
typedef void(*	REGISTRAR )(void)

Detailed Description

This header is unique, as it defines epicsExportSharedSymbols and thus triggers a transition between importing declarations from other libraries, to exporting symbols from our own library. The comments in shareLib.h provide more information.

This header should be included with a trailing comment to make it stand out from other includes, something like this:

#include <epicsExport.h>  // defines epicsExportSharedSymbols

Definition in file epicsExport.h.

Macro Definition Documentation

#define epicsExportAddress	(		typ,
			obj
	)

Value:

epicsShareExtern typ *EPICS_EXPORT_POBJ(typ,obj); \
    epicsShareDef typ *EPICS_EXPORT_POBJ(typ, obj) = (typ *) (char *) &obj

The epicsExportAddress() macro must be used to declare any IOC object that is also named in a DBD file. For example a record support source file must contain a statement like:

epicsExportAddress(rset, myRSET);

A device support source file must contain a statement like:

epicsExportAddress(dset, devMyName);

Note that the typ parameter for a device support entry table must be spelled dset even if the obj was actually declared as some other type, say using typed_dset .

A driver support source file must contain a statement like:

epicsExportAddress(drvet, drvName);

A variable named in a DBD variable statement must be declared with:

int myDebug = 0;
epicsExportAddress(int, myDebug);

Only int and double are currently supported for DBD variables.

Parameters

typ	Object's data type.
obj	Object's name.

Note

C++ code needs to wrap with

extern "C" { } 

Definition at line 75 of file epicsExport.h.

#define epicsExportRegistrar

(

fun

)

epicsShareFunc REGISTRAR EPICS_EXPORT_PFUNC(fun) = (REGISTRAR) &fun

The epicsExportRegistrar() macro must be used to declare a registrar function that is named in a DBD registrar statement. For example:

static void myRegistrar(void) {
    ...
}
epicsExportRegistrar(myRegistrar);

Parameters

fun	Registrar function's name.

Note

C++ code needs to wrap with

extern "C" { } 

Definition at line 94 of file epicsExport.h.

#define epicsRegisterFunction

(

fun

)

Value:

static void register_func_ ## fun(void) \
    { \
        registryFunctionAdd(#fun, (REGISTRYFUNCTION) fun); \
    } \
    epicsExportRegistrar(register_func_ ## fun)

The epicsRegisterFunction() macro must be used to declare and register a function that is named in a DBD function statement and called by one or more subroutine or aSub records. For example:

epicsRegisterFunction(mySubInit);
epicsRegisterFunction(mySubProcess);

Parameters

fun	Function's name

Note

C++ code needs to wrap with

extern "C" { } 

Definition at line 111 of file epicsExport.h.