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Annotation of 43BSDTahoe/ucb/talk/ctl_transact.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 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[] = "@(#)ctl_transact.c     5.4 (Berkeley) 6/29/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include "talk_ctl.h"
        !            23: #include <sys/time.h>
        !            24: 
        !            25: #define CTL_WAIT 2     /* time to wait for a response, in seconds */
        !            26: 
        !            27: /*
        !            28:  * SOCKDGRAM is unreliable, so we must repeat messages if we have
        !            29:  * not recieved an acknowledgement within a reasonable amount
        !            30:  * of time
        !            31:  */
        !            32: ctl_transact(target, msg, type, rp)
        !            33:        struct in_addr target;
        !            34:        CTL_MSG msg;
        !            35:        int type;
        !            36:        CTL_RESPONSE *rp;
        !            37: {
        !            38:        int read_mask, ctl_mask, nready, cc;
        !            39:        struct timeval wait;
        !            40: 
        !            41:        msg.type = type;
        !            42:        daemon_addr.sin_addr = target;
        !            43:        daemon_addr.sin_port = daemon_port;
        !            44:        ctl_mask = 1 << ctl_sockt;
        !            45: 
        !            46:        /*
        !            47:         * Keep sending the message until a response of
        !            48:         * the proper type is obtained.
        !            49:         */
        !            50:        do {
        !            51:                wait.tv_sec = CTL_WAIT;
        !            52:                wait.tv_usec = 0;
        !            53:                /* resend message until a response is obtained */
        !            54:                do {
        !            55:                        cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
        !            56:                                &daemon_addr, sizeof (daemon_addr));
        !            57:                        if (cc != sizeof (msg)) {
        !            58:                                if (errno == EINTR)
        !            59:                                        continue;
        !            60:                                p_error("Error on write to talk daemon");
        !            61:                        }
        !            62:                        read_mask = ctl_mask;
        !            63:                        nready = select(32, &read_mask, 0, 0, &wait);
        !            64:                        if (nready < 0) {
        !            65:                                if (errno == EINTR)
        !            66:                                        continue;
        !            67:                                p_error("Error waiting for daemon response");
        !            68:                        }
        !            69:                } while (nready == 0);
        !            70:                /*
        !            71:                 * Keep reading while there are queued messages 
        !            72:                 * (this is not necessary, it just saves extra
        !            73:                 * request/acknowledgements being sent)
        !            74:                 */
        !            75:                do {
        !            76:                        cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
        !            77:                        if (cc < 0) {
        !            78:                                if (errno == EINTR)
        !            79:                                        continue;
        !            80:                                p_error("Error on read from talk daemon");
        !            81:                        }
        !            82:                        read_mask = ctl_mask;
        !            83:                        /* an immediate poll */
        !            84:                        timerclear(&wait);
        !            85:                        nready = select(32, &read_mask, 0, 0, &wait);
        !            86:                } while (nready > 0 && (rp->vers != TALK_VERSION ||
        !            87:                    rp->type != type));
        !            88:        } while (rp->vers != TALK_VERSION || rp->type != type);
        !            89:        rp->id_num = ntohl(rp->id_num);
        !            90:        rp->addr.sa_family = ntohs(rp->addr.sa_family);
        !            91: }

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