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

1.1     ! root        1: /* udpsend.c - udpsend */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <network.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  *  udpsend  -  send one UDP datagram to a given (foreign) IP address
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: udpsend(faddr, fport, lport, packet, datalen)
        !            12: IPaddr faddr;
        !            13: short  fport;
        !            14: short  lport;
        !            15: struct epacket *packet;
        !            16: int    datalen;
        !            17: {
        !            18:        register struct udp     *udpptr;
        !            19:        register struct ip      *ipptr;
        !            20: 
        !            21:        /* Fill in UDP header; pass to ipsend to fill in IP header */
        !            22: 
        !            23:        ipptr = (struct ip *) packet->ep_data;
        !            24:        ipptr->i_proto = IPRO_UDP;
        !            25:        udpptr = (struct udp *) ipptr->i_data;
        !            26:        udpptr->u_sport = hs2net(lport);
        !            27:        udpptr->u_dport = hs2net(fport);
        !            28:        udpptr->u_udplen = hs2net(UHLEN+datalen);
        !            29:        if (isodd(datalen))
        !            30:                udpptr->u_data[datalen] = (char)0;
        !            31:        udpptr->u_ucksum = 0;
        !            32:        return( ipsend(faddr, packet, UHLEN+datalen) );
        !            33: }

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