Quick Reference

API Data Descriptions for the C Wrapper

This document describes the client API data structures available for the C Wrapper and covers the following topics:

Conventions Used for API Data Descriptions
API Data Descriptions

Conventions Used for API Data Descriptions

The following naming conventions are used to describe the EntireX RPC API data structures:

Naming Convention	Data Type
`ulXXXXX`	unsigned long
`usXXXXX`	unsigned short
`uXXXXX`	unsigned ... (predefined types such as `ptrdiff_t`)
`szXXXXX`	zero terminated string
`pXXXXX`	pointer to ...

API Data Descriptions

ERX_CLIENT_IDENTIFICATION

typedef  struct                 tagERX_CLIENT_IDENTIFICATION
{
   const char    * pUserId;           /* string, required max [32 + 1] bytes */
   const char    * pPassword;         /* string, any length */
   const char    * pToken;            /* string, max [32 + 1] bytes */
   const char    * pNewPassword;      /* string, any length */
   const char    * pRpcUserId;        /* string, any length */
   const char    * pRpcPassword;      /* string, any length */
   const char    * pSSLParameter;     /* string, any length */
   char            szSecurityToken     [ ERX_MAX_SECURITY_TOKEN_LENGTH + 1 ];
   char            cForceLogon;
   unsigned char   uEncryptionLevel;  /* Deprecated. Use AT-TLS on z/OS
                                         ATLS on z/VSE or SSL/TLS on
                                         other platforms. */
   unsigned char   uCompressionLevel;
}  ERX_CLIENT_IDENTIFICATION;

Field	Description	More Information
`*pUserId`	Mandatory. The user ID for access to the broker.	Using the Broker and RPC User ID/Password
`*pPassword`	Optional. The password for secured access to the broker.	Using the Broker and RPC User ID/Password
`*pToken`	Optional. Token used by the EntireX Broker to identify the caller.	`USER-ID` and `TOKEN` under Writing Client and Server Applications in the ACI Programming documentation
`*pNewPassword`	Optional. For changing the password to a new password.	Changing your Password under Writing Applications using EntireX Security
`*pRpcUserId`	Optional. The RPC user ID sent to the RPC server.	Using the Broker and RPC User ID/Password
`*pRpcPassword`	Optional. The RPC password sent to the RPC server.	Using the Broker and RPC User ID/Password
`*pSSLParameter`	Secure Sockets Layer settings are provided here as a null-terminated string.	Using SSL/TLS
`szSecurityToken`	Security token generated by EntireX Security and EntireX Broker after successful security validation.	Role of Security Token (STOKEN) during Authentication under Writing Applications using EntireX Security
`cForceLogon`	Mandatory. Determines whether explicit logon or autologon is used by the caller.	`FORCE-LOGON` under Writing Applications using EntireX Security
`uEncryptionLevel`	Deprecated. For encrypted transport we strongly recommend using the Secure Sockets Layer/Transport Layer Security protocol. See SSL/TLS, HTTP(S), and Certificates with EntireX.
`uCompressionLevel`	Optional.	Data Compression under Writing Client and Server Applications in the ACI Programming documentation

ERX_SERVER_ADDRESS

typedef  struct              tagERX_SERVER_ADDRESS
{
   ERXeMedium Medium;
   unsigned long             ulTimeOut;
   union
   {
     ERX_SA_BROKER           BROKER;
     ERX_SA_BROKER_LIBRARY   BROKER_Library;
     ERX_SA_CONNECTION       Connection;
   }  Address;
}  ERX_SERVER_ADDRESS;

Field Description

Medium Mandatory.
Selects an RPC server.
The following types are supported:
ERX_TM_BROKER ( for backward compatibility)
ERX_TM_BROKER_LIBRARY
ERX_TM_CONNECTION
This type of medium is used for the connection-oriented (conversational) RPC. After successful ERXConnect (that is, after opening the conversation), the RPCs are invoked using ERX_TM_CONNECTION. Any open conversation must be closed with ERXDisconnectCommit or aborted with ERXDisconnect.

Field	Description
`Medium`	Mandatory. Selects an RPC server. The following types are supported: `ERX_TM_BROKER` ( for backward compatibility) `ERX_TM_BROKER_LIBRARY` `ERX_TM_CONNECTION` This type of medium is used for the connection-oriented (conversational) RPC. After successful `ERXConnect` (that is, after opening the conversation), the RPCs are invoked using `ERX_TM_CONNECTION`. Any open conversation must be closed with `ERXDisconnectCommit` or aborted with `ERXDisconnect`.
`ulTimeOut`	Mandatory. Gives the timeout value for the transport system in seconds. Corresponds to the `WAIT` field of the ACI control block. Note: Zero is not a valid value.

ulTimeOut

Mandatory.

Gives the timeout value for the transport system in seconds.
Corresponds to the WAIT field of the ACI control block.

Note:
Zero is not a valid value.

Address

Depending on the Medium field, the Address union holds the necessary information to address a server:

`BROKER`

Field	Description
`szEtbidName`	Mandatory. Broker ID used. Corresponds to the `BROKER-ID` field of the ACI control block.
`szClassName`	Mandatory. Class Name of the EntireX/Natural RPC server. Use RPC for Natural RPC Server. Corresponds to the `SERVER-CLASS` field of the ACI control block.
`szServerName`	Mandatory. Server Name of the EntireX/Natural RPC server. Corresponds to the `SERVER-NAME` field of the ACI control block.
`szServiceName`	Mandatory. Service Name of the EntireX/Natural RPC server. Use `CALLNAT` for Natural RPC Server. Corresponds to the `SERVICE` field of the ACI control block.

`BROKER-LIBRARY`

Field	Description
`szEtbidName`	Mandatory. Broker ID used. Corresponds to the `BROKER-ID` field of the ACI control block.
`szClassName`	Mandatory. Class Name of the EntireX/Natural RPC server. Use RPC for Natural RPC Server. Corresponds to the `SERVER-CLASS` field of the ACI control block.
`szServerName`	Mandatory. Server Name of the EntireX/Natural RPC server. Corresponds to the `SERVER-NAME` field of the ACI control block.
`szServiceName`	Mandatory. Service Name of the EntireX/Natural RPC server. Use `CALLNAT` for Natural RPC Server. Corresponds to the `SERVICE` field of the ACI control block.
`szLibraryName`	Mandatory. Library sent to the target RPC server by the client. The library specified here overrides any library information specified in the IDL file, see `library-definition`. Usage depends on the target RPC server type: Natural RPC server Set `cNaturalLogon` (see below) to Y for library usage, that is, log on to the library. EntireX RPC server The library given here is used.
`cNaturalLogon`	Enable to send the RPC user ID/password pair. For more information see Using the Broker and RPC User ID/Password. Valid values: Y,N. Use the macro definition `ERX_NATURAL LOGON_YES` and `ERX_NATURAL LOGON_NO` from erx.h to set the values.
`cCompression`	Mandatory. Specify `ERX_COMPRESSION_YES` always. Note: Data Compression in EntireX Broker is something different and is controlled by field `uCompressionLevel` in API structure `ERX_CLIENT_IDENTIFICATION`.

`CONNECTION`

Contains internal information for EntireX runtime.

Warning:
Do not modify

ERX_CALL_IDENTIFICATION

typedef     struct         tagERX_CALL_IDENTIFICATION
{
   char     szLibraryName  [ ERX_MAX_LIBRARY_NAME_LENGTH + 1 ];
   char     szProgramName  [ ERX_MAX_PROGRAM_NAME_LENGTH + 1 ];
   unsigned long           ulVersion;
}  ERX_CALL_IDENTIFICATION;

Field	Description
`szLibraryName`	The name of the library where the program to be called resides. The format depends on the environment. For a mainframe Natural server, for example, the name of the library must be uppercase.
`szProgramName`	The name of the program to be called. The format depends on the environment. For a mainframe Natural server, for example, the name of the program must be uppercase.
`ulVersion`	Reserved for future use, should be set to zero.

ERX_PARAMETER_DEFINITION_V3

typedef                     struct             tagERX_PARAMETER_DEFINITION
{
   char                     szParameterName    [ ERX_MAX_PARAMETER_NAME_LENGTH + 1 ];
   ERXeTypeCode             usType;
   ERXeAttributes           usAttributes;
   size_t                   uElementLength;
   ERX_OBJECT_SIZE          uSize
   unsigned long            uParent;
   unsigned long            uOccurrence        [ ERX_MAX_INDICES ];
   ERX_POINTER_DIFFERENCE   uBase;
   ERX_POINTER_DIFFERENCE   uDelta             [ ERX_MAX_INDICES ];
   void                     *pCallInfoBlock;
}  ERX_PARAMETER_DEFINITION_V3;

Field	Description
`szParameterName`	The name of the parameter.
`usType`	The data type including parameter type direction and index count. See IDL Data Types. Bits: FEDCBA9876543210 UUUUUUTTTTTTDDNN U: Unused T: Type Code `ERX_TYPE_A`, `STRING FIXED LENGTH` `ERX_TYPE_AV`, `STRING VARIABLE LENGTH` `ERX_TYPE_K`, `KANJI FIXED LENGTH` `ERX_TYPE_KV`, `KANJI VARIABLE LENGTH` `ERX_TYPE_L`, `LOGICAL` `ERX_TYPE_I`, `INTEGER` `ERX_TYPE_N`, `UNPACKED DECIMAL` `ERX_TYPE_NU`, `UNPACKED DECIMAL UNSIGNED` `ERX_TYPE_P`, `PACKED DECIMAL` `ERX_TYPE_PU`, `PACKED DECIMAL UNSIGNED` `ERX_TYPE_F`, `FLOAT` `ERX_TYPE_T`, `DATE & TIME` `ERX_TYPE_D`, `DATE` `ERX_TYPE_B`, `BINARY FIXED LENGTH` `ERX_TYPE_BV`, `BINARY VARIABLE LENGTH` `ERX_TYPE_G`, `GROUP` `ERX_TYPE_S`, `STRUCTURES` `ERX_TYPE_U`, `UNICODE FIXED LENGTH` `ERX_TYPE_UV`, `UNICODE VARIABLE LENGTH` D: Parameter Direction `ERX_IN_PARM` `ERX_OUT_PARM` `ERX_INOUT_PARM` N: Index Count ( 0 .. 3 ) All other bits must be zero.
`usAttributes`	Attributes can be combined by OR when they are not exclusive, such as `ERX_ATTR_STRING and ERX_ATTR_MF_ALPHA`. For a list of `Attributes` see the following table.
`uElementLength`	Information on the logical length of the parameter. For `ERX_TYPE_A`, for example, A10 in the IDL file has a `uElementLength` of 11 when mapped to string with `ERX_ATTR_STRING`. It has a `uElementLength` of 10 when mapped with `ERX_ATTR_MF_ALPHA`.
`uSize`	The physical size of the parameter in bytes.
`uOccurrence`	The count of elements in each dimension in ascending order. For unbounded arrays: when set presents a possible maximum. Unbounded arrays with value zero have no maximum.
`uBase`	The address of the base of the parameter.
`uDelta`	The difference for each dimension between following elements in ascending order.
`uCallInfoBlock`	Pointer to `CallInfoBlock` for structures `ERX_TYPE_S`.

Attributes

Attribute	Description
`ERX_ATTR_ARRAY_V1`	First dimension of array is unbounded. Attribute evaluated by Software AG IDL Compiler.
`ERX_ATTR_ARRAY_V2`	Second dimension of array is unbounded. Attribute evaluated by Software AG IDL Compiler.
`ERX_ATTR_ARRAY_V3`	Third dimension of array is unbounded. Attribute evaluated by Software AG IDL Compiler.
`ERX_ATTR_ALIGNED`	The parameter is aligned on the server side. The attribute is evaluated by the Software AG IDL Compiler. Used by EntireX RPC server on CICS.
`ERX_ATTR_DOUBLE`	The parameter is mapped to C data type double. Valid for: `ERX_TYPE_P` `ERX_TYPE_PU` `ERX_TYPE_N` `ERX_TYPE_NU` The mapping can be forced by a template by adding 32768 to the `%TypeAttribute` macro of the Software AG IDL Compiler.
`ERX_ATTR_PACKED`	The parameter is mapped to C data type `char[...]` contained in IBM mainframe packed format. Valid for: `ERX_TYPE_P` `ERX_TYPE_PU` Default mapping for P and PU data types; used when nothing is added to the `%TypeAttribute`.
`ERX_ATTR_UNPACKED`	The parameter is mapped to C data type `char[...]` contained in IBM mainframe packed format. Valid for: `ERX_TYPE_N` `ERX_TYPE_NU` Default mapping for N and NU data types; used when nothing is added to the `%TypeAttribute`.
`ERX_ATTR_STRING`	The parameter is mapped to a null terminated string. Valid for `ERX_TYPE_A` The mapping can be forced by a template by adding 16384 to the `%TypeAttribute` macro of the Software AG IDL Compiler.
`ERX_ATTR_MF_ALPHA`	The parameter is mapped to C data type `char[...]` - but without a NULL terminator. Valid for: `ERX_TYPE_A` Default attribute for A data types; is used when nothing is added to the %TypeAttribute.
`ERX_ATTR_NOTHING`	Use when none of the mappings described above apply.

ERX_CALL_INFORMATION_BLOCK

typedef  struct                        tagERX_CALL_INFORMATION_BLOCK
{
   ERX_CALL_IDENTIFICATION             Callee;
   unsigned short                      uParameterCount;
   ERX_PARAMETER_DEFINITION_V3         *pParmDef;
}  ERX_CALL_INFORMATION_BLOCK;

Field	Description
`Callee`	The identification of the program to be called, see `ERX_CALL_IDENTIFICATION`
`uParameterCount`	The total count of the parameters (the number of entries in the parameter definition array).
`pParmDef`	A pointer to the parameter definition array. See `ERX_PARAMETER_DEFINITION_V3`_V3

ERX_ERROR_INFORMATION

typedef  struct          tagERX_ERROR_INFO
{
   ERXeReturnCode        rc;
   char                  szMessage[ 256 ];
}  ERX_ERROR_INFO;

Field	Description
`rc`	The last return code returned. See Error Messages and Codes.
`szMessage`	Error message. Text associated with the last return code issued.

ERX_IS_SERVING

typedef struct          tagERX_IS_SERVING
{
   char                 *pMessage;
   int                  uMessageLength;
}  ERX_IS_SERVING;

Field	Description
`pMessage`	Pointer to the provided buffer for server's "alive" message.
`uMessageLength`	Length of the provided buffer.

ERX_TERMINATE_SERVER

typedef  enum
{
   ERX_SHUTDOWN_IMMED_ALL = 1,
   ERX_SHUTDOWN_ANYONE = 2
}  ERXeShutdownCommand;
typedef struct tagERX_TERMINATE_SERVER
{
   ERXeShutdownCommand       eShutdownCommand;
   char                      *pMessage;
   int                       uMessageLength;
}  ERX_TERMINATE_SERVER;

Field	Description
`eShutdownCommand`	The shutdown method to be used. ERX_SHUTDOWN_IMMED_ALL Using EntireX Broker Command Service. Using this method forces all instances of RPC servers (Java, Natural, Linux, Windows, CICS, etc.) to be shut down. ERX_SHUTDOWN_ANYONE Directly to EntireX RPC Server. If multiple instances of RPC servers (Java, Natural, Linux, Windows, CICS, etc.) are registered under the same class/server/service name at the broker, only one single RPC server instance is shut down. There is no control over which instance is shut down. To shut down all RPC server instances, you have to repeat the function until no more RPC server instances are registered. This method is compatible with the method from versions of EntireX RPC prior to EntireX 5.3.1. Note: We strongly recommend using only `ERX_SHUTDOWN_IMMED_ALL`. `ERX_SHUTDOWN _ANYONE` is ignored and may result in an error.
`pMessage`	Pointer to the provided buffer for server's "completion" message.
`uMessageLength`	Length of the provided buffer.

ERX_CONTEXT_BLOCK

typedef struct tagERX_CONTEXT_BLOCK
{
   ERXCallId                   ERXCallId;
   ERXeReturnCode              ERXrc;
   ERX_ERROR_INFO              ERXErrorInfo;
   ERX_SERVER_ADDRESS          ERXServer;
   ERX_CLIENT_IDENTIFICATION   ERXClient;
}  ERX_CONTEXT_BLOCK;

Field	Description
`ERXCallId`	The `CallId` returned by a caller.
`ERXrc`	EntireX RPC Error Code. See Error Messages and Codes.
`ERXErrorInfo`	EntireX RPC Error information, see `ERX_ERROR_INFORMATION`.
`ERXServer`	The server address, see `ERX_SERVER_ADDRESS`.
`ERXClient`	The client identification, see `ERX_CLIENT_IDENTIFICATION`.

ERX_SVM_VERSION_1

#define ERX_SVM_VERSION_1 (unsigned long) 1
typedef struct tagERX_SVM_V1
{
   unsigned long  version;
   char          *pProtocol;
   char          *pSM;
   char          *pFA;
   char          *pVA;
   char          * pSA;
}  ERX_SVM_V1;

Field	Description
`version`	Version of this control block. Initialitze with `ERX_SVM_VERSION_1`.
`pProtocol`	RPC protocol version from the related server mapping file (Designer file with extension .cvm) evaluated by the Software AG IDL Compiler and provided in the `output_substitution_sequence` `%SVMRpcProtocol`.
`pSM`	Pointer to the meta data part of the related server mapping file evaluated by the IDL Compiler and provided in the `output_substitution_sequence` `%SVMMetaData`.
`pFA`	Pointer to the format area of the related server mapping file evaluated by the IDL Compiler and provided in the `output_substitution_sequence` `%SVMFormatArea`.
`pSA`	Pointer to the string area of the related server mapping file evaluated by the IDL Compiler and provided in the `output_substitution_sequence` `%SVMStringArea`.