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Annotation of src/usr.bin/talk/ctl_transact.c, Revision 1.1.1.1

1.1       deraadt     1: /*     $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $     */
                      2:
                      3: /*
                      4:  * Copyright (c) 1983, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #ifndef lint
                     37: #if 0
                     38: static char sccsid[] = "@(#)ctl_transact.c     8.1 (Berkeley) 6/6/93";
                     39: #endif
                     40: static char rcsid[] = "$NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $";
                     41: #endif /* not lint */
                     42:
                     43: #include <sys/types.h>
                     44: #include <sys/socket.h>
                     45: #include <sys/time.h>
                     46: #include <netinet/in.h>
                     47: #include <protocols/talkd.h>
                     48: #include <errno.h>
                     49: #include "talk_ctl.h"
                     50:
                     51: #define CTL_WAIT 2     /* time to wait for a response, in seconds */
                     52:
                     53: /*
                     54:  * SOCKDGRAM is unreliable, so we must repeat messages if we have
                     55:  * not recieved an acknowledgement within a reasonable amount
                     56:  * of time
                     57:  */
                     58: ctl_transact(target, msg, type, rp)
                     59:        struct in_addr target;
                     60:        CTL_MSG msg;
                     61:        int type;
                     62:        CTL_RESPONSE *rp;
                     63: {
                     64:        int read_mask, ctl_mask, nready, cc;
                     65:        struct timeval wait;
                     66:
                     67:        msg.type = type;
                     68:        daemon_addr.sin_addr = target;
                     69:        daemon_addr.sin_port = daemon_port;
                     70:        ctl_mask = 1 << ctl_sockt;
                     71:
                     72:        /*
                     73:         * Keep sending the message until a response of
                     74:         * the proper type is obtained.
                     75:         */
                     76:        do {
                     77:                wait.tv_sec = CTL_WAIT;
                     78:                wait.tv_usec = 0;
                     79:                /* resend message until a response is obtained */
                     80:                do {
                     81:                        cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
                     82:                            (struct sockaddr *)&daemon_addr,
                     83:                            sizeof (daemon_addr));
                     84:                        if (cc != sizeof (msg)) {
                     85:                                if (errno == EINTR)
                     86:                                        continue;
                     87:                                p_error("Error on write to talk daemon");
                     88:                        }
                     89:                        read_mask = ctl_mask;
                     90:                        nready = select(32, &read_mask, 0, 0, &wait);
                     91:                        if (nready < 0) {
                     92:                                if (errno == EINTR)
                     93:                                        continue;
                     94:                                p_error("Error waiting for daemon response");
                     95:                        }
                     96:                } while (nready == 0);
                     97:                /*
                     98:                 * Keep reading while there are queued messages
                     99:                 * (this is not necessary, it just saves extra
                    100:                 * request/acknowledgements being sent)
                    101:                 */
                    102:                do {
                    103:                        cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
                    104:                        if (cc < 0) {
                    105:                                if (errno == EINTR)
                    106:                                        continue;
                    107:                                p_error("Error on read from talk daemon");
                    108:                        }
                    109:                        read_mask = ctl_mask;
                    110:                        /* an immediate poll */
                    111:                        timerclear(&wait);
                    112:                        nready = select(32, &read_mask, 0, 0, &wait);
                    113:                } while (nready > 0 && (rp->vers != TALK_VERSION ||
                    114:                    rp->type != type));
                    115:        } while (rp->vers != TALK_VERSION || rp->type != type);
                    116:        rp->id_num = ntohl(rp->id_num);
                    117:        rp->addr.sa_family = ntohs(rp->addr.sa_family);
                    118: }