usr.bin/tip/hunt.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)hunt.c   8.1 (Berkeley) 6/6/93
  30  * $FreeBSD: src/usr.bin/tip/tip/hunt.c,v 1.5 1999/08/28 01:06:33 peter Exp $
  31  */
  32
  33 #include <sys/types.h>
  34 #include <err.h>
  35 #include <libutil.h>
  36 #include "tip.h"
  37
  38 static  jmp_buf deadline;
  39 static  int deadfl;
  40
  41 static void
  42 dead(int signo)
  43 {
  44         deadfl = 1;
  45         longjmp(deadline, 1);
  46 }
  47
  48 long
  49 hunt(char *name)
  50 {
  51         char *cp;
  52         sig_t f;
  53         int res;
  54
  55         f = signal(SIGALRM, dead);
  56         while ((cp = getremote(name))) {
  57                 deadfl = 0;
  58                 if ((uucplock = strrchr(cp, '/')) == NULL)
  59                         uucplock = cp;
  60                 else
  61                         ++uucplock;
  62                 if ((res = uu_lock(uucplock)) != UU_LOCK_OK) {
  63                         if (res != UU_LOCK_INUSE)
  64                                 fprintf(stderr, "uu_lock: %s\n", uu_lockerr(res));
  65                         continue;
  66                 }
  67                 /*
  68                  * Straight through call units, such as the BIZCOMP,
  69                  * VADIC and the DF, must indicate they're hardwired in
  70                  *  order to get an open file descriptor placed in FD.
  71                  * Otherwise, as for a DN-11, the open will have to
  72                  *  be done in the "open" routine.
  73                  */
  74                 if (!HW)
  75                         break;
  76                 if (setjmp(deadline) == 0) {
  77                         alarm(10);
  78                         FD = open(cp, O_RDWR);
  79                 }
  80                 alarm(0);
  81                 if (FD < 0) {
  82                         warn("%s", cp);
  83                         deadfl = 1;
  84                 }
  85                 if (!deadfl) {
  86                         ioctl(FD, TIOCEXCL, 0);
  87                         {
  88                                 struct termios t;
  89                                 if (tcgetattr(FD, &t) == 0) {
  90                                         t.c_cflag |= HUPCL;
  91                                         (void)tcsetattr(FD, TCSANOW, &t);
  92                                 }
  93                         }
  94                         signal(SIGALRM, SIG_DFL);
  95                         return ((long)cp);
  96                 }
  97                 (void)uu_unlock(uucplock);
  98         }
  99         signal(SIGALRM, f);
 100         return (deadfl ? -1 : (long)cp);
 101 }