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Annotation of 43BSDTahoe/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.
                      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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