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Annotation of xinu/sys/getpath.c, revision 1.1

1.1     ! root        1: /* getpath.c - getpath */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: #include <network.h>
        !             7: 
        !             8: /*------------------------------------------------------------------------
        !             9:  *  getpath  -  find a path (route table entry) for a given IP address
        !            10:  *------------------------------------------------------------------------
        !            11:  */
        !            12: getpath(faddr)
        !            13: IPaddr faddr;
        !            14: {
        !            15:        int     i;
        !            16:        int     arindex;                /* route table entry index      */
        !            17:        int     mypid;                  /* local copy of my process id  */
        !            18:        IPaddr  myaddr;                 /* my IP address                */
        !            19:        PStype  ps;
        !            20:        register struct arpent  *arpptr;
        !            21:        register struct arppak  *apacptr;
        !            22:        struct  epacket *packet, *mkarp();
        !            23: 
        !            24:        wait(Arp.arpsem);
        !            25:        arpptr = &Arp.arptab[ arindex = arpfind(faddr) ];
        !            26:        if (arpptr->arp_state != AR_ALLOC) {
        !            27:                signal(Arp.arpsem);
        !            28:                return(arindex);
        !            29:        }
        !            30: 
        !            31:        /* Use ARP to obtain and record IP-to-Ether binding */
        !            32:        
        !            33:        getaddr(myaddr);
        !            34:        mypid = getpid();
        !            35:        for (i=0 ; i < AR_RTRY ; i++) {
        !            36:                packet = mkarp(EP_ARP, AR_REQ, myaddr, faddr);
        !            37:                blkcopy(Arp.arpwant, faddr, AR_PLEN);
        !            38:                disable(ps);
        !            39:                Arp.arppid = mypid;
        !            40:                recvclr();
        !            41:                write(ETHER, packet, EMINPAK);
        !            42:                restore(ps);
        !            43:                if (recvtim(AR_TIME) == OK)
        !            44:                        break;
        !            45:        }
        !            46:        Arp.arppid = BADPID;
        !            47:        signal(Arp.arpsem);
        !            48:        return(arindex);
        !            49: }

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