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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1994 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* create a Datakit connection to a remote destination
*/
#ifndef DIAL
static char SCCSID[] = "@(#)dkdial.c 2.7+BNU DKHOST 87/03/09";
#endif
/*
* COMMKIT(TM) Software - Datakit(R) VCS Interface Release 2.0 V1
*/
#include <fcntl.h>
#include "dk.h"
#include <stdio.h>
#include <signal.h>
#define SIGRTN void
#include <setjmp.h>
#include <sysexits.h>
#include <errno.h>
#define DK_DEFWAIT 89 /* default time to wait for dial return */
#define DK_MAXWAIT 600 /* maximum wait to allow the caller - 10 min */
GLOBAL unsigned int dk_timewait = DK_DEFWAIT; /* Caller to dkdial might modify */
static char Conn_Msg[] = "Can't connect to %s: %s\n";
static char Resp_Msg[] = "No response from Datakit";
static SIGRTN timout(); /* Alarm signal handler */
static void setalarm(), usralarm();
EXTERN int dkndial();
static int Elapsed; /* Alarm time elapsed during dial */
static int Timer; /* Current alarm setting */
static short TimeErr; /* Alarm clock rang */
extern char *getenv();
EXTERN int dk_verbose, dk_errno;
GLOBAL int
dkdial(dest)
char *dest;
{
return(dkndial(dest, atoi(getenv("DKINTF"))));
}
GLOBAL int
dkndial(dest, intf)
char *dest;
{
short fd; /* Channel Descriptor */
SIGRTN (*SigWas)(); /* Caller's alarm handler */
unsigned int TimWas; /* Caller's alarm clock */
char *key;
struct diocdial {
struct diocreq iocb;
char dialstring[128];
} ioreq;
char dial_dev[32];
sprintf(dial_dev, "/dev/dk/dial%d", intf);
/*
** Clear our elapsed time and save caller's alarm stuff.
*/
Timer = Elapsed = 0;
SigWas = signal(SIGALRM, timout);
TimWas = alarm(0);
/*
** If requested timeout interval is unreasonable, use the default.
*/
if ((dk_timewait == 0) || (dk_timewait > DK_MAXWAIT))
dk_timewait = DK_DEFWAIT;
/*
** Do an alarm protected open of the dial device
*/
setalarm(dk_timewait);
if ((fd = open(dial_dev, O_RDWR)) < 0) {
setalarm(0);
if (dk_verbose)
fprintf(stderr, "dkdial: Can't open %s\n", dial_dev);
usralarm(TimWas, SigWas);
if (errno == EBUSY)
return(dk_errno = -EX_TEMPFAIL);
else
return(dk_errno = -EX_OSFILE);
}
/*
** If the caller has a DKKEY, use it.
*/
if((key = getenv("DKKEY")) != NULL && getuid() == geteuid())
sprintf(ioreq.dialstring, "%s\n%s", dest, key);
else
strcpy(ioreq.dialstring, dest);
ioreq.iocb.req_traffic = 0;
ioreq.iocb.req_1param = 0;
ioreq.iocb.req_2param = 0;
/*
** Try to dial the call. If the alarm expires during the ioctl,
** the ioctl will return in error.
*/
if (ioctl(fd, DKIODIAL, &ioreq) < 0) {
setalarm(0);
if (dk_verbose)
if (TimeErr)
fprintf(stderr, Conn_Msg, Resp_Msg, ioreq.dialstring);
else
fprintf(stderr, Conn_Msg, ioreq.dialstring, dkerr(ioreq.iocb.req_error));
setalarm(2); /* Don't wait forever on close */
close(fd);
usralarm(TimWas, SigWas);
if (errno == EBUSY)
return(-dkerrmap(dk_errno = -EX_TEMPFAIL));
else
return(-dkerrmap(dk_errno = ioreq.iocb.req_error));
}
usralarm(TimWas, SigWas);
return (fd);
}
/*
** timout() is the alarm clock signal handling routine. It is called
** whenever the alarm clock expires during dial processing.
*/
/* ARGSUSED */
static SIGRTN
timout(arg)
int arg;
{
TimeErr++;
}
/*
** setalarm() is called to request an alarm at a future time. The residual
** from the previous alarm (if any) is added to the elapsed time counter.
*/
static void
setalarm(Seconds)
{
TimeErr = 0;
(void) signal(SIGALRM, timout);
Elapsed += Timer - alarm(Seconds);
Timer = Seconds;
}
/*
** usralarm() is used to restore the alarm service for the caller.
*/
static void
usralarm(TimWas, SigWas)
int TimWas; /* Caller's alarm clock */
SIGRTN (*SigWas)(); /* Caller's alarm handler */
{
Elapsed += Timer - alarm(0);
(void) signal(SIGALRM, SigWas);
if (TimWas > 0) {
TimWas -= Elapsed;
if (TimWas < 2)
TimWas = 2;
}
alarm(TimWas);
}
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