diff options
Diffstat (limited to 'usr.bin/talk/ctl_transact.c')
| -rw-r--r-- | usr.bin/talk/ctl_transact.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/usr.bin/talk/ctl_transact.c b/usr.bin/talk/ctl_transact.c new file mode 100644 index 0000000..4d0613f --- /dev/null +++ b/usr.bin/talk/ctl_transact.c @@ -0,0 +1,108 @@ +/* $NetBSD: ctl_transact.c,v 1.11 2011/09/06 18:32:03 joerg Exp $ */ + +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#ifndef lint +#if 0 +static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; +#endif +__RCSID("$NetBSD: ctl_transact.c,v 1.11 2011/09/06 18:32:03 joerg Exp $"); +#endif /* not lint */ + +#include "talk.h" +#include <sys/time.h> +#include <errno.h> +#include <unistd.h> +#include <poll.h> +#include "talk_ctl.h" + +#define CTL_WAIT 2 /* time to wait for a response, in seconds */ + +/* + * SOCKDGRAM is unreliable, so we must repeat messages if we have + * not received an acknowledgement within a reasonable amount + * of time + */ +void +ctl_transact(struct in_addr target, CTL_MSG tmsg, int type, CTL_RESPONSE *rp) +{ + struct pollfd set[1]; + int nready, cc; + + nready = 0; + tmsg.type = type; + daemon_addr.sin_addr = target; + daemon_addr.sin_port = daemon_port; + set[0].fd = ctl_sockt; + set[0].events = POLLIN; + + /* + * Keep sending the message until a response of + * the proper type is obtained. + */ + do { + /* resend message until a response is obtained */ + do { + cc = sendto(ctl_sockt, (char *)&tmsg, sizeof (tmsg), 0, + (struct sockaddr *)&daemon_addr, + sizeof (daemon_addr)); + if (cc != sizeof (tmsg)) { + if (errno == EINTR) + continue; + p_error("Error on write to talk daemon"); + } + nready = poll(set, 1, CTL_WAIT * 1000); + if (nready < 0) { + if (errno == EINTR) + continue; + p_error("Error waiting for daemon response"); + } + } while (nready == 0); + /* + * Keep reading while there are queued messages + * (this is not necessary, it just saves extra + * request/acknowledgements being sent) + */ + do { + cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); + if (cc < 0) { + if (errno == EINTR) + continue; + p_error("Error on read from talk daemon"); + } + /* an immediate poll */ + nready = poll(set, 1, 0); + } while (nready > 0 && (rp->vers != TALK_VERSION || + rp->type != type)); + } while (rp->vers != TALK_VERSION || rp->type != type); + rp->id_num = ntohl(rp->id_num); + rp->addr.sa_family = ntohs(rp->addr.sa_family); +} |