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Annotation of src/usr.bin/talk/ctl_transact.c, Revision 1.6

1.6     ! millert     1: /*     $OpenBSD: ctl_transact.c,v 1.5 1998/08/18 04:02:10 millert Exp $        */
1.1       deraadt     2: /*     $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $     */
                      3:
                      4: /*
                      5:  * Copyright (c) 1983, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: #if 0
                     39: static char sccsid[] = "@(#)ctl_transact.c     8.1 (Berkeley) 6/6/93";
                     40: #endif
1.6     ! millert    41: static char rcsid[] = "$OpenBSD: ctl_transact.c,v 1.5 1998/08/18 04:02:10 millert Exp $";
1.1       deraadt    42: #endif /* not lint */
                     43:
1.4       pjanzen    44: #include "talk.h"
1.1       deraadt    45: #include <sys/time.h>
                     46: #include <errno.h>
1.4       pjanzen    47: #include <unistd.h>
1.1       deraadt    48: #include "talk_ctl.h"
                     49:
                     50: #define CTL_WAIT 2     /* time to wait for a response, in seconds */
                     51:
                     52: /*
                     53:  * SOCKDGRAM is unreliable, so we must repeat messages if we have
1.4       pjanzen    54:  * not received an acknowledgement within a reasonable amount
1.1       deraadt    55:  * of time
                     56:  */
1.4       pjanzen    57: void
1.1       deraadt    58: ctl_transact(target, msg, type, rp)
                     59:        struct in_addr target;
                     60:        CTL_MSG msg;
                     61:        int type;
                     62:        CTL_RESPONSE *rp;
                     63: {
1.4       pjanzen    64:        fd_set read_mask, ctl_mask;
                     65:        int nready, cc;
1.1       deraadt    66:        struct timeval wait;
                     67:
                     68:        msg.type = type;
                     69:        daemon_addr.sin_addr = target;
                     70:        daemon_addr.sin_port = daemon_port;
1.4       pjanzen    71:        FD_ZERO(&ctl_mask);
                     72:        FD_SET(ctl_sockt, &ctl_mask);
1.1       deraadt    73:
                     74:        /*
                     75:         * Keep sending the message until a response of
                     76:         * the proper type is obtained.
                     77:         */
                     78:        do {
                     79:                wait.tv_sec = CTL_WAIT;
                     80:                wait.tv_usec = 0;
                     81:                /* resend message until a response is obtained */
                     82:                do {
                     83:                        cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
                     84:                            (struct sockaddr *)&daemon_addr,
                     85:                            sizeof (daemon_addr));
                     86:                        if (cc != sizeof (msg)) {
                     87:                                if (errno == EINTR)
                     88:                                        continue;
1.6     ! millert    89:                                quit("Error on write to talk daemon", 1);
1.1       deraadt    90:                        }
                     91:                        read_mask = ctl_mask;
                     92:                        nready = select(32, &read_mask, 0, 0, &wait);
                     93:                        if (nready < 0) {
                     94:                                if (errno == EINTR)
                     95:                                        continue;
1.6     ! millert    96:                                quit("Error waiting for daemon response", 1);
1.1       deraadt    97:                        }
                     98:                } while (nready == 0);
                     99:                /*
1.5       millert   100:                 * Keep reading while there are queued messages
1.1       deraadt   101:                 * (this is not necessary, it just saves extra
                    102:                 * request/acknowledgements being sent)
                    103:                 */
                    104:                do {
                    105:                        cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
                    106:                        if (cc < 0) {
                    107:                                if (errno == EINTR)
                    108:                                        continue;
1.6     ! millert   109:                                quit("Error on read from talk daemon", 1);
1.1       deraadt   110:                        }
                    111:                        read_mask = ctl_mask;
                    112:                        /* an immediate poll */
                    113:                        timerclear(&wait);
                    114:                        nready = select(32, &read_mask, 0, 0, &wait);
                    115:                } while (nready > 0 && (rp->vers != TALK_VERSION ||
                    116:                    rp->type != type));
                    117:        } while (rp->vers != TALK_VERSION || rp->type != type);
                    118:        rp->id_num = ntohl(rp->id_num);
                    119: }