MLClose()

#include "mathlink.h"

int main(int argc, char **argv)
{
    MLENV ep;
    MLINK lp;
    int error;

    ep = MLInitialize((MLParametersPointer)0);
    if(ep == (MLENV)0)
        { /* environment initialization failed */ }

    lp = MLOpenArgv(ep, argv, argv + argc, &error);
    if(lp == (MLINK)0 || error != MLEOK)
        { /* link creation failed */ }

    ...

    MLClose(lp);
    MLDeinitialize(ep);

    return 0;
}