This function ascends out of a chunk in a RIFF file that was descended into by mmioDescend or created by mmioCreateChunk.

#define INCL_MMIOOS2
#include <os2.h>

HMMIO        hmmio;    /*  Open file handle. */
PMMCKINFO    pckinfo;  /*  Pointer to MMCKINFO. */
USHORT       usFlags;  /*  Reserved. */
USHORT       rc;       /*  Return codes. */

rc = mmioAscend(hmmio, pckinfo, usFlags);