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