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Annotation of src/usr.bin/tip/hunt.c, Revision 1.3

1.3     ! deraadt     1: /*     $OpenBSD: hunt.c,v 1.5 1995/10/29 00:49:40 pk Exp $     */
1.2       deraadt     2: /*     $NetBSD: hunt.c,v 1.5 1995/10/29 00:49:40 pk Exp $      */
1.1       deraadt     3:
                      4: /*
                      5:  * Copyright (c) 1983, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: #if 0
                     39: static char sccsid[] = "@(#)hunt.c     8.1 (Berkeley) 6/6/93";
                     40: #endif
1.3     ! deraadt    41: static char rcsid[] = "$OpenBSD: hunt.c,v 1.5 1995/10/29 00:49:40 pk Exp $";
1.1       deraadt    42: #endif /* not lint */
                     43:
                     44: #include "tip.h"
                     45:
                     46: extern char *getremote();
                     47: extern char *rindex();
                     48:
                     49: static jmp_buf deadline;
                     50: static int deadfl;
                     51:
                     52: void
                     53: dead()
                     54: {
                     55:        deadfl = 1;
                     56:        longjmp(deadline, 1);
                     57: }
                     58:
                     59: long
                     60: hunt(name)
                     61:        char *name;
                     62: {
                     63:        register char *cp;
                     64:        sig_t f;
                     65:
                     66:        f = signal(SIGALRM, dead);
                     67:        while (cp = getremote(name)) {
                     68:                deadfl = 0;
                     69:                uucplock = rindex(cp, '/')+1;
                     70:                if (uu_lock(uucplock) < 0)
                     71:                        continue;
                     72:                /*
                     73:                 * Straight through call units, such as the BIZCOMP,
                     74:                 * VADIC and the DF, must indicate they're hardwired in
                     75:                 *  order to get an open file descriptor placed in FD.
                     76:                 * Otherwise, as for a DN-11, the open will have to
                     77:                 *  be done in the "open" routine.
                     78:                 */
                     79:                if (!HW)
                     80:                        break;
                     81:                if (setjmp(deadline) == 0) {
                     82:                        alarm(10);
                     83:                        FD = open(cp, O_RDWR);
                     84:                }
                     85:                alarm(0);
                     86:                if (FD < 0) {
                     87:                        perror(cp);
                     88:                        deadfl = 1;
                     89:                }
                     90:                if (!deadfl) {
1.2       deraadt    91:                        struct termios cntrl;
                     92:
                     93:                        tcgetattr(FD, &cntrl);
                     94:                        cntrl.c_cflag |= HUPCL;
                     95:                        tcsetattr(FD, TCSAFLUSH, &cntrl);
1.1       deraadt    96:                        ioctl(FD, TIOCEXCL, 0);
                     97:                        signal(SIGALRM, SIG_DFL);
                     98:                        return ((long)cp);
                     99:                }
                    100:                (void)uu_unlock(uucplock);
                    101:        }
                    102:        signal(SIGALRM, f);
                    103:        return (deadfl ? -1 : (long)cp);
                    104: }