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hunt.c revision 1.1 
      1 /*
      2  * Copyright (c) 1983 The Regents of the University of California.
      3  * 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 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)hunt.c	5.6 (Berkeley) 6/1/90";
     36 #endif /* not lint */
     37 
     38 #include "tip.h"
     39 
     40 extern char *getremote();
     41 extern char *rindex();
     42 
     43 static	jmp_buf deadline;
     44 static	int deadfl;
     45 
     46 void
     47 dead()
     48 {
     49 	deadfl = 1;
     50 	longjmp(deadline, 1);
     51 }
     52 
     53 hunt(name)
     54 	char *name;
     55 {
     56 	register char *cp;
     57 	sig_t f;
     58 
     59 	f = signal(SIGALRM, dead);
     60 	while (cp = getremote(name)) {
     61 		deadfl = 0;
     62 		uucplock = rindex(cp, '/')+1;
     63 		if (uu_lock(uucplock) < 0)
     64 			continue;
     65 		/*
     66 		 * Straight through call units, such as the BIZCOMP,
     67 		 * VADIC and the DF, must indicate they're hardwired in
     68 		 *  order to get an open file descriptor placed in FD.
     69 		 * Otherwise, as for a DN-11, the open will have to
     70 		 *  be done in the "open" routine.
     71 		 */
     72 		if (!HW)
     73 			break;
     74 		if (setjmp(deadline) == 0) {
     75 			alarm(10);
     76 			FD = open(cp, O_RDWR);
     77 		}
     78 		alarm(0);
     79 		if (FD < 0) {
     80 			perror(cp);
     81 			deadfl = 1;
     82 		}
     83 		if (!deadfl) {
     84 			ioctl(FD, TIOCEXCL, 0);
     85 			ioctl(FD, TIOCHPCL, 0);
     86 			signal(SIGALRM, SIG_DFL);
     87 			return ((int)cp);
     88 		}
     89 		(void)uu_unlock(uucplock);
     90 	}
     91 	signal(SIGALRM, f);
     92 	return (deadfl ? -1 : (int)cp);
     93 }
     94