1 /* $NetBSD: hunt.c,v 1.16 2006/12/14 17:09:43 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 1.16 2006/12/14 17:09:43 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 __unused) 50 { 51 deadfl = 1; 52 longjmp(deadline, 1); 53 } 54 55 int 56 hunt(char *name) 57 { 58 char *cp; 59 sig_t f; 60 61 f = signal(SIGALRM, dead); 62 while ((cp = getremote(name)) != NULL) { 63 deadfl = 0; 64 /* 65 * Straight through call units, such as the BIZCOMP, 66 * VADIC and the DF, must indicate they're hardwired in 67 * order to get an open file descriptor placed in FD. 68 * Otherwise, as for a DN-11, the open will have to 69 * be done in the "open" routine. 70 */ 71 if (!HW) 72 break; 73 if (setjmp(deadline) == 0) { 74 (void)alarm(10); 75 FD = open(cp, (O_RDWR | (DC ? O_NONBLOCK : 0))); 76 } 77 (void)alarm(0); 78 if (FD < 0) { 79 warn(cp); 80 deadfl = 1; 81 } else if (!deadfl) { 82 struct termios cntrl; 83 84 if (flock(FD, (LOCK_EX|LOCK_NB)) != 0) { 85 (void)close(FD); 86 FD = -1; 87 continue; 88 } 89 90 (void)tcgetattr(FD, &cntrl); 91 if (!DC) 92 cntrl.c_cflag |= HUPCL; 93 (void)tcsetattr(FD, TCSAFLUSH, &cntrl); 94 (void)ioctl(FD, TIOCEXCL, 0); 95 (void)signal(SIGALRM, SIG_DFL); 96 return (cp != NULL); 97 } 98 } 99 (void)signal(SIGALRM, f); 100 return (deadfl ? -1 : cp != NULL); 101 } 102