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hunt.c revision 1.6 
      1 /*	$NetBSD: hunt.c,v 1.6 1997/04/20 00:02:10 mellon Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)hunt.c	8.1 (Berkeley) 6/6/93";
     39 #endif
     40 static char rcsid[] = "$NetBSD: hunt.c,v 1.6 1997/04/20 00:02:10 mellon Exp $";
     41 #endif /* not lint */
     42 
     43 #include "tip.h"
     44 
     45 extern char *getremote();
     46 extern char *rindex();
     47 
     48 static	jmp_buf deadline;
     49 static	int deadfl;
     50 
     51 void
     52 dead()
     53 {
     54 	deadfl = 1;
     55 	longjmp(deadline, 1);
     56 }
     57 
     58 long
     59 hunt(name)
     60 	char *name;
     61 {
     62 	register char *cp;
     63 	sig_t f;
     64 
     65 	f = signal(SIGALRM, dead);
     66 	while (cp = getremote(name)) {
     67 		deadfl = 0;
     68 		uucplock = rindex(cp, '/')+1;
     69 		if (uu_lock(uucplock) < 0)
     70 			continue;
     71 		/*
     72 		 * Straight through call units, such as the BIZCOMP,
     73 		 * VADIC and the DF, must indicate they're hardwired in
     74 		 *  order to get an open file descriptor placed in FD.
     75 		 * Otherwise, as for a DN-11, the open will have to
     76 		 *  be done in the "open" routine.
     77 		 */
     78 		if (!HW)
     79 			break;
     80 		if (setjmp(deadline) == 0) {
     81 			alarm(10);
     82 			FD = open(cp, (O_RDWR |
     83 				       (boolean(value(DC)) ? O_NONBLOCK : 0)));
     84 		}
     85 		alarm(0);
     86 		if (FD < 0) {
     87 			perror(cp);
     88 			deadfl = 1;
     89 		}
     90 		if (!deadfl) {
     91 			struct termios cntrl;
     92 
     93 			tcgetattr(FD, &cntrl);
     94 			if (!boolean(value(DC)))
     95 				cntrl.c_cflag |= HUPCL;
     96 			tcsetattr(FD, TCSAFLUSH, &cntrl);
     97 			ioctl(FD, TIOCEXCL, 0);
     98 			signal(SIGALRM, SIG_DFL);
     99 			return ((long)cp);
    100 		}
    101 		(void)uu_unlock(uucplock);
    102 	}
    103 	signal(SIGALRM, f);
    104 	return (deadfl ? -1 : (long)cp);
    105 }
    106