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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)hunt.c   8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/tip/tip/hunt.c,v 1.5 1999/08/28 01:06:33 peter Exp $
  35  */
  36
  37 #include <sys/types.h>
  38 #include <err.h>
  39 #include <libutil.h>
  40 #include "tipconf.h"
  41 #include "tip.h"
  42
  43 static  jmp_buf deadline;
  44 static  int deadfl;
  45
  46 static void
  47 dead(int signo)
  48 {
  49         deadfl = 1;
  50         longjmp(deadline, 1);
  51 }
  52
  53 long
  54 hunt(char *name)
  55 {
  56         char *cp;
  57         sig_t f;
  58         int res;
  59
  60         f = signal(SIGALRM, dead);
  61         while ((cp = getremote(name))) {
  62                 deadfl = 0;
  63                 if ((uucplock = strrchr(cp, '/')) == NULL)
  64                         uucplock = cp;
  65                 else
  66                         ++uucplock;
  67                 if ((res = uu_lock(uucplock)) != UU_LOCK_OK) {
  68                         if (res != UU_LOCK_INUSE)
  69                                 fprintf(stderr, "uu_lock: %s\n", uu_lockerr(res));
  70                         continue;
  71                 }
  72                 /*
  73                  * Straight through call units, such as the BIZCOMP,
  74                  * VADIC and the DF, must indicate they're hardwired in
  75                  *  order to get an open file descriptor placed in FD.
  76                  * Otherwise, as for a DN-11, the open will have to
  77                  *  be done in the "open" routine.
  78                  */
  79                 if (!HW)
  80                         break;
  81                 if (setjmp(deadline) == 0) {
  82                         alarm(10);
  83                         FD = open(cp, O_RDWR);
  84                 }
  85                 alarm(0);
  86                 if (FD < 0) {
  87                         warn("%s", cp);
  88                         deadfl = 1;
  89                 }
  90                 if (!deadfl) {
  91                         ioctl(FD, TIOCEXCL, 0);
  92 #if HAVE_TERMIOS
  93                         {
  94                                 struct termios t;
  95                                 if (tcgetattr(FD, &t) == 0) {
  96                                         t.c_cflag |= HUPCL;
  97                                         (void)tcsetattr(FD, TCSANOW, &t);
  98                                 }
  99                         }
 100 #else /* HAVE_TERMIOS */
 101 #ifdef TIOCHPCL
 102                         ioctl(FD, TIOCHPCL, 0);
 103 #endif
 104 #endif /* HAVE_TERMIOS */
 105                         signal(SIGALRM, SIG_DFL);
 106                         return ((long)cp);
 107                 }
 108                 (void)uu_unlock(uucplock);
 109         }
 110         signal(SIGALRM, f);
 111         return (deadfl ? -1 : (long)cp);
 112 }