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Annotation of 43BSDTahoe/old/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     5.1 (Berkeley) 6/6/85";
                      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, response)
                     22:        struct in_addr target;
                     23:        CTL_MSG msg;
                     24:        int type;
                     25:        CTL_RESPONSE *response;
                     26: {
                     27:        struct sockaddr junk;
                     28:        int read_mask;
                     29:        int ctl_mask;
                     30:        int nready;
                     31:        int cc;
                     32:        int junk_size;
                     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 the right
                     42:         * type is obtained
                     43:         */
                     44:        do {
                     45:                wait.tv_sec = CTL_WAIT;
                     46:                wait.tv_usec = 0;
                     47: 
                     48:                /* keep sending the message until a response is obtained */
                     49:                do {
                     50:                        cc = sendto(ctl_sockt, (char *)&msg, sizeof(CTL_MSG), 0,
                     51:                                &daemon_addr, sizeof(daemon_addr));
                     52:                        if (cc != sizeof(CTL_MSG)) {
                     53:                                if (errno == EINTR)
                     54:                                        continue;
                     55:                                p_error("Error on write to talk daemon");
                     56:                        }
                     57:                        read_mask = ctl_mask;
                     58:                        if ((nready = select(32, &read_mask, 0, 0, &wait)) < 0) {
                     59:                                if (errno == EINTR)
                     60:                                        continue;
                     61:                                p_error("Error waiting for daemon response");
                     62:                        }
                     63:                } while (nready == 0);
                     64:                /* keep reading while there are queued messages 
                     65:                   (this is not necessary, it just saves extra
                     66:                   request/acknowledgements being sent)
                     67:                 */
                     68:                do {
                     69:                        junk_size = sizeof(junk);
                     70:                        cc = recvfrom(ctl_sockt, (char *)response,
                     71:                            sizeof (CTL_RESPONSE), 0, &junk, &junk_size);
                     72:                        if (cc < 0) {
                     73:                                if (errno == EINTR)
                     74:                                        continue;
                     75:                                p_error("Error on read from talk daemon");
                     76:                        }
                     77:                        read_mask = ctl_mask;
                     78:                        /* an immediate poll */
                     79:                        timerclear(&wait);
                     80:                        nready = select(32, &read_mask, 0, 0, &wait);
                     81:                } while (nready > 0 && response->type != type);
                     82:        } while (response->type != type);
                     83: }

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