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Annotation of 43BSD/ucb/talk/ctl_transact.c, revision 1.1.1.1

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

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