This function returns the last error condition stored in the ulErrorRet field of the MMIOINFO structure that might contain additional information for the analysis of the last error routine.

#define INCL_MMIOOS2
#include <os2.h>

HMMIO    hmmio;  /*  Open file handle. */
ULONG    rc;     /*  Return code. */

rc = mmioGetLastError(hmmio);