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/* $OpenBSD: hunt.c,v 1.19 2010/07/03 03:38:22 nicm Exp $ */
/* $NetBSD: hunt.c,v 1.6 1997/04/20 00:02:10 mellon 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 <util.h>
#include "tip.h"
static jmp_buf deadline;
static int deadflag;
static void dead(int);
/*ARGSUSED*/
static void
dead(int signo)
{
deadflag = 1;
longjmp(deadline, 1);
}
/* Find and open the host. Returns the fd, or exits on error. */
int
hunt(char *hosts)
{
char *copy, *last, *host, *device;
struct termios tio;
int fd, tried;
sig_t old_alrm;
if (hosts == NULL) {
hosts = getenv("HOST");
if (hosts == NULL)
errx(3, "no host specified");
}
if ((copy = strdup(hosts)) == NULL)
err(1, "strdup");
last = copy;
old_alrm = signal(SIGALRM, dead);
tried = 0;
while ((host = strsep(&last, ",")) != NULL) {
device = getremote(host);
uucplock = strrchr(device, '/');
if (uucplock == NULL)
uucplock = strdup(device);
else
uucplock = strdup(uucplock + 1);
if (uucplock == NULL)
err(1, "strdup");
if (uu_lock(uucplock) != UU_LOCK_OK)
continue;
deadflag = 0;
if (setjmp(deadline) == 0) {
alarm(10);
fd = open(device,
O_RDWR | (vgetnum(DC) ? O_NONBLOCK : 0));
if (fd < 0)
perror(device);
}
alarm(0);
tried++;
if (fd >= 0 && !deadflag) {
tcgetattr(fd, &tio);
if (!vgetnum(DC))
tio.c_cflag |= HUPCL;
if (tcsetattr(fd, TCSAFLUSH, &tio) != 0)
errx(1, "tcsetattr");
if (ioctl(fd, TIOCEXCL) != 0)
errx(1, "ioctl");
signal(SIGALRM, old_alrm);
return (fd);
}
uu_unlock(uucplock);
free(uucplock);
}
free(copy);
signal(SIGALRM, old_alrm);
if (tried == 0) {
printf("all ports busy\n");
exit(3);
}
printf("link down\n");
exit(3);
}
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