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Annotation of 43BSDReno/games/hunt/NEW/ctl_transact.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #include "bsd.h"
        !             8: 
        !             9: #if    defined(TALK_43) || defined(TALK_42)
        !            10: 
        !            11: #ifndef lint
        !            12: static char sccsid[] = "@(#)ctl_transact.c     5.2 (Berkeley) 3/13/86";
        !            13: #endif not lint
        !            14: 
        !            15: #include "talk_ctl.h"
        !            16: #include <sys/time.h>
        !            17: 
        !            18: #define CTL_WAIT 2     /* time to wait for a response, in seconds */
        !            19: #define MAX_RETRY 5
        !            20: 
        !            21: /*
        !            22:  * SOCKDGRAM is unreliable, so we must repeat messages if we have
        !            23:  * not recieved an acknowledgement within a reasonable amount
        !            24:  * of time
        !            25:  */
        !            26: ctl_transact(target, msg, type, rp)
        !            27:        struct in_addr target;
        !            28:        CTL_MSG msg;
        !            29:        int type;
        !            30:        CTL_RESPONSE *rp;
        !            31: {
        !            32:        int read_mask, ctl_mask, nready, cc, retries;
        !            33:        struct timeval wait;
        !            34: 
        !            35:        msg.type = type;
        !            36:        daemon_addr.sin_addr = target;
        !            37:        daemon_addr.sin_port = daemon_port;
        !            38:        ctl_mask = 1 << ctl_sockt;
        !            39: 
        !            40:        /*
        !            41:         * Keep sending the message until a response of
        !            42:         * the proper type is obtained.
        !            43:         */
        !            44:        do {
        !            45:                wait.tv_sec = CTL_WAIT;
        !            46:                wait.tv_usec = 0;
        !            47:                /* resend message until a response is obtained */
        !            48:                for (retries = MAX_RETRY; retries > 0; retries -= 1) {
        !            49:                        cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
        !            50:                                &daemon_addr, sizeof (daemon_addr));
        !            51:                        if (cc != sizeof (msg)) {
        !            52:                                if (errno == EINTR)
        !            53:                                        continue;
        !            54:                                p_error("Error on write to talk daemon");
        !            55:                        }
        !            56:                        read_mask = ctl_mask;
        !            57:                        nready = select(32, &read_mask, 0, 0, &wait);
        !            58:                        if (nready < 0) {
        !            59:                                if (errno == EINTR)
        !            60:                                        continue;
        !            61:                                p_error("Error waiting for daemon response");
        !            62:                        }
        !            63:                        if (nready != 0)
        !            64:                                break;
        !            65:                }
        !            66:                if (retries <= 0)
        !            67:                        break;
        !            68:                /*
        !            69:                 * Keep reading while there are queued messages 
        !            70:                 * (this is not necessary, it just saves extra
        !            71:                 * request/acknowledgements being sent)
        !            72:                 */
        !            73:                do {
        !            74:                        cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
        !            75:                        if (cc < 0) {
        !            76:                                if (errno == EINTR)
        !            77:                                        continue;
        !            78:                                p_error("Error on read from talk daemon");
        !            79:                        }
        !            80:                        read_mask = ctl_mask;
        !            81:                        /* an immediate poll */
        !            82:                        timerclear(&wait);
        !            83:                        nready = select(32, &read_mask, 0, 0, &wait);
        !            84:                } while (nready > 0 && (
        !            85: #ifdef TALK_43
        !            86:                    rp->vers != TALK_VERSION ||
        !            87: #endif
        !            88:                    rp->type != type));
        !            89:        } while (
        !            90: #ifdef TALK_43
        !            91:            rp->vers != TALK_VERSION ||
        !            92: #endif
        !            93:            rp->type != type);
        !            94:        rp->id_num = ntohl(rp->id_num);
        !            95: #ifdef TALK_43
        !            96:        rp->addr.sa_family = ntohs(rp->addr.sa_family);
        !            97: # else
        !            98:        rp->addr.sin_family = ntohs(rp->addr.sin_family);
        !            99: # endif
        !           100: }
        !           101: #endif

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