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Annotation of 43BSDTahoe/etc/timed/acksend.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1985 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)acksend.c  2.6 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include "globals.h"
        !            23: #include <protocols/timed.h>
        !            24: 
        !            25: #define RECEIVED       0
        !            26: #define LOST           1
        !            27: #define SECFORACK      1       /* seconds */
        !            28: #define USECFORACK     0       /* microseconds */
        !            29: #define MAXCOUNT       5
        !            30: 
        !            31: struct tsp *answer;
        !            32: 
        !            33: /*
        !            34:  * Acksend implements reliable datagram transmission by using sequence 
        !            35:  * numbers and retransmission when necessary.
        !            36:  * `name' is the name of the destination
        !            37:  * `addr' is the address to send to
        !            38:  * If `name' is ANYADDR, this routine implements reliable broadcast.
        !            39:  */
        !            40: 
        !            41: struct tsp *acksend(message, addr, name, ack, net)
        !            42: struct tsp *message;
        !            43: struct sockaddr_in *addr;
        !            44: char *name;
        !            45: int ack;
        !            46: struct netinfo *net;
        !            47: {
        !            48:        int count;
        !            49:        int flag;
        !            50:        extern u_short sequence;
        !            51:        struct timeval tout;
        !            52:        struct tsp *readmsg();
        !            53: 
        !            54:        count = 0;
        !            55: 
        !            56:        message->tsp_vers = TSPVERSION;
        !            57:        message->tsp_seq = sequence;
        !            58:        if (trace) {
        !            59:                fprintf(fd, "acksend: ");
        !            60:                if (name == ANYADDR)
        !            61:                        fprintf(fd, "broadcast: ");
        !            62:                else
        !            63:                        fprintf(fd, "%s: ", name);
        !            64:                print(message, addr);
        !            65:        }
        !            66:        bytenetorder(message);
        !            67:        do {
        !            68:                if (sendto(sock, (char *)message, sizeof(struct tsp), 0, addr,
        !            69:                    sizeof(struct sockaddr_in)) < 0) {
        !            70:                        syslog(LOG_ERR, "acksend: sendto: %m");
        !            71:                        exit(1);
        !            72:                }
        !            73:                tout.tv_sec = SECFORACK;
        !            74:                tout.tv_usec = USECFORACK;
        !            75:                answer  = readmsg(ack, name, &tout, net);
        !            76:                if (answer != NULL) {
        !            77:                        if (answer->tsp_seq != sequence) {
        !            78:                                if (trace)
        !            79:                                        fprintf(fd, "acksend: seq # %d != %d\n",
        !            80:                                            answer->tsp_seq, sequence);
        !            81:                                continue;
        !            82:                        }
        !            83:                        flag = RECEIVED;
        !            84:                } else {
        !            85:                        flag = LOST;
        !            86:                        if (++count == MAXCOUNT) {
        !            87:                                break;
        !            88:                        }
        !            89:                }
        !            90:        } while (flag != RECEIVED);
        !            91:        sequence++;
        !            92:        return(answer);
        !            93: }

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