1 /* $NetBSD: hunt.c,v 1.15 2006/04/30 23:34:50 christos 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)hunt.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 __RCSID("$NetBSD: hunt.c,v 1.15 2006/04/30 23:34:50 christos Exp $"); 38 #endif /* not lint */ 39 40 #include "tip.h" 41 42 static jmp_buf deadline; 43 static int deadfl; 44 45 void dead(int); 46 47 void 48 /*ARGSUSED*/ 49 dead(int dummy) 50 { 51 52 deadfl = 1; 53 longjmp(deadline, 1); 54 } 55 56 int 57 hunt(char *name) 58 { 59 char *cp; 60 sig_t f; 61 62 f = signal(SIGALRM, dead); 63 while ((cp = getremote(name)) != NULL) { 64 deadfl = 0; 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 | (DC ? O_NONBLOCK : 0))); 77 } 78 alarm(0); 79 if (FD < 0) { 80 warn(cp); 81 deadfl = 1; 82 } else if (!deadfl) { 83 struct termios cntrl; 84 85 if (flock(FD, (LOCK_EX|LOCK_NB)) != 0) { 86 close(FD); 87 FD = -1; 88 continue; 89 } 90 91 tcgetattr(FD, &cntrl); 92 if (!DC) 93 cntrl.c_cflag |= HUPCL; 94 tcsetattr(FD, TCSAFLUSH, &cntrl); 95 ioctl(FD, TIOCEXCL, 0); 96 signal(SIGALRM, SIG_DFL); 97 return (cp != NULL); 98 } 99 } 100 signal(SIGALRM, f); 101 return (deadfl ? -1 : cp != NULL); 102 } 103