Technical Reference: Base Operating System and Extensions , Volume 2

RSiFirstCx Subroutine

Purpose

Returns the first subcontext of an SpmiCx context.

Library

RSI Library (libSpmi.a)

Syntax

#include sys/Rsi.h

struct SpmiCxLink *RSiFirstCx(rhandle, context, name,
descr)
RSiHandle rhandle;
cx_handle *context;
char **name;
char **descr;

Description

The RSiFirstCx subroutine performs the following actions:

1. Validates that the context identified by the second argument exists.
2. Returns a handle to the first element of the list of subcontexts defined for the context.
3. Returns the short name and description of the subcontext.

Parameters

rhandleMust be an RSiHandle, which was previously initialized by the RSiOpen (RSiOpen Subroutine) subroutine.

contextMust be a handle of type cx_handle, which was previously returned by a successful RSiPathGetCx (RSiPathGetCx Subroutine) subroutine call.

nameMust be a pointer to a pointer to a character array. The pointer must be initialized to point at a character array pointer. When the subroutine call is successful, the short name of the subcontext is returned in the character array pointer.

descrMust be a pointer to a pointer to a character array. The pointer must be initialized to point at a character array pointer. When the subroutine call is successful, the description of the subcontext is returned in the character array pointer.

Return Values

If successful, the subroutine returns a pointer to a structure of type struct SpmiCxLink. If an error occurs or if the context doesn't contain subcontexts, NULL is returned and an error text may be placed in the external character array RSiEMsg.

Error Codes

All RSI subroutines use external variables to provide error information. To access these variables, an application program must define the following external variables:

• extern char RSiEMsg[];
• extern int RSiErrno;

If the subroutine returns without an error, the RSiErrno variable is set to RSiOkay and the RSiEMsg character array is empty. If an error is detected, the RSiErrno variable returns an error code, as defined in the enum RSiErrorType. RSi error codes are described in List of RSi Error Codes.

Implementation Specifics

This subroutine is part of the Performance Toolbox for AIX licensed product.

Files

Related Information

For related information, see:

• RSiNextCx Subroutine
• RSiOpen Subroutine
• RSiPathGetCx Subroutine.