MLReady()

#include "mathlink.h"

/* check a link for readable data */

void f(MLINK);
{
    if(! MLFlush(lp))
        { /* unable to flush any outgoing data buffered in lp */ }

    if(MLReady(lp))
        { /* read the data from the link */ }
    else
        { /* data not ready to read */ }
}