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hunt.c revision 1.9 
      1 /*	$NetBSD: hunt.c,v 1.9 1998/07/12 09:59:30 mrg 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 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)hunt.c	8.1 (Berkeley) 6/6/93";
     40 #endif
     41 __RCSID("$NetBSD: hunt.c,v 1.9 1998/07/12 09:59:30 mrg Exp $");
     42 #endif /* not lint */
     43 
     44 #include "tip.h"
     45 
     46 static	jmp_buf deadline;
     47 static	int deadfl;
     48 
     49 void	dead __P((int));
     50 
     51 void
     52 dead(dummy)
     53 	int dummy;
     54 {
     55 
     56 	deadfl = 1;
     57 	longjmp(deadline, 1);
     58 }
     59 
     60 int
     61 hunt(name)
     62 	char *name;
     63 {
     64 	char *cp;
     65 	sig_t f;
     66 
     67 	f = signal(SIGALRM, dead);
     68 	while ((cp = getremote(name)) != NULL) {
     69 		deadfl = 0;
     70 		uucplock = strrchr(cp, '/')+1;
     71 		if (uu_lock(uucplock) < 0)
     72 			continue;
     73 		/*
     74 		 * Straight through call units, such as the BIZCOMP,
     75 		 * VADIC and the DF, must indicate they're hardwired in
     76 		 *  order to get an open file descriptor placed in FD.
     77 		 * Otherwise, as for a DN-11, the open will have to
     78 		 *  be done in the "open" routine.
     79 		 */
     80 		if (!HW)
     81 			break;
     82 		if (setjmp(deadline) == 0) {
     83 			alarm(10);
     84 			FD = open(cp, (O_RDWR | (DC ? O_NONBLOCK : 0)));
     85 		}
     86 		alarm(0);
     87 		if (FD < 0) {
     88 			perror(cp);
     89 			deadfl = 1;
     90 		}
     91 		if (!deadfl) {
     92 			struct termios cntrl;
     93 
     94 			tcgetattr(FD, &cntrl);
     95 			if (!DC)
     96 				cntrl.c_cflag |= HUPCL;
     97 			tcsetattr(FD, TCSAFLUSH, &cntrl);
     98 			ioctl(FD, TIOCEXCL, 0);
     99 			signal(SIGALRM, SIG_DFL);
    100 			return (cp != NULL);
    101 		}
    102 		(void)uu_unlock(uucplock);
    103 	}
    104 	signal(SIGALRM, f);
    105 	return (deadfl ? -1 : cp != NULL);
    106 }
    107