ptdelete.c

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#include <xinu.h>

syscall ptdelete(int32 portid, int32 (*disp)(int32))
{
    intmask mask;          /* Saved interrupt mask      */
    struct ptentry *ptptr; /* Pointer to port table entry   */

    mask = disable();
    if (isbadport(portid) ||
        (ptptr = &porttab[portid])->ptstate != PT_ALLOC)
    {
        restore(mask);
        return SYSERR;
    }
    _ptclear(ptptr, PT_FREE, disp);
    ptnextid = portid;
    restore(mask);
    return OK;
}