PxMsgSetData()

Set message data pointer.

APPLIES TO

8.2.0

SYNOPSIS

PxError_t PxMsgSetData (PxMsg_t msgid, PxMsgData_t new_data);

ARGUMENTS

msgid: Message object for which the new data pointer is set

new_data: New message data

RETURN VALUES

PXROS error code

ERROR CODES

PXERR_MSG_ILLMSG

The passed message handle is invalid

PXERR_MSG_ILLOWNER

The calling task is not the owner of the message

PXERR_MSG_ILLUSER

The calling task is not the user of the message

PXERR_MSG_ILL_NEW_DATA

The new data pointer not within the corresponding data area

DESCRIPTION

PxMsgSetData sets the data pointer of message msgid to new_data. The calling task must be the user of msgid. new_data must be part of the messages data area. If new_data is NULL, the message’s data pointer is reset to the start of the data area. In this case the calling task must be the owner of msgid.

IMPLEMENTATION GUIDELINES

Before call

msgid must be a valid message object, requested via PxMsgRequest… or PxMsgEnvelop… or received by a PxMsgReceive… call (V). This id may be checked with one of the following macros:
- PxMsgIdIsValid() must be true.
- PxMsgIdGet() must not be _PXIllegalObjId.
- PxMsgIdError() must be PXERR_NOERROR otherwise the returned error code has to be interpreted (C).
new_data must be a pointer to an address within the message’s orignial data buffer (V).

After call

The function returns PXERR_NOERROR if the message’s data area is changed. Any other return value describes an error, which has to be interpreted (C).

Best Practice

No restrictions.

SEE ALSO

USAGE

#include "pxdef.h"

PxError_t Err = PxMsgSetData(msgid, (PxMsgData_t) 0);

if (Err != PXERR_NOERROR) {
    // Report error
}