ptreset.c

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/* ptreset.c - ptreset */

#include <xinu.h>

syscall ptreset(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_ALLOC, disp);
    restore(mask);
    return OK;
}