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Annotation of src/usr.bin/tip/hunt.c, Revision 1.10

1.10    ! millert     1: /*     $OpenBSD: hunt.c,v 1.9 2002/05/07 06:56:50 hugh Exp $   */
1.5       millert     2: /*     $NetBSD: hunt.c,v 1.6 1997/04/20 00:02:10 mellon 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.
1.10    ! millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #ifndef lint
                     34: #if 0
                     35: static char sccsid[] = "@(#)hunt.c     8.1 (Berkeley) 6/6/93";
                     36: #endif
1.10    ! millert    37: static const char rcsid[] = "$OpenBSD: hunt.c,v 1.9 2002/05/07 06:56:50 hugh Exp $";
1.1       deraadt    38: #endif /* not lint */
                     39:
                     40: #include "tip.h"
                     41:
                     42: extern char *getremote();
                     43:
                     44: static jmp_buf deadline;
                     45: static int deadfl;
                     46:
                     47: void
                     48: dead()
                     49: {
                     50:        deadfl = 1;
                     51:        longjmp(deadline, 1);
                     52: }
                     53:
                     54: long
                     55: hunt(name)
                     56:        char *name;
                     57: {
1.8       millert    58:        char *cp;
1.1       deraadt    59:        sig_t f;
                     60:
                     61:        f = signal(SIGALRM, dead);
1.6       deraadt    62:        while ((cp = getremote(name))) {
1.1       deraadt    63:                deadfl = 0;
1.7       deraadt    64:                uucplock = strrchr(cp, '/');
                     65:                if (uucplock == NULL)
                     66:                        uucplock = cp;
                     67:                else
                     68:                        uucplock++;
                     69:
1.1       deraadt    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);
1.5       millert    83:                        FD = open(cp, (O_RDWR |
                     84:                                       (boolean(value(DC)) ? O_NONBLOCK : 0)));
1.1       deraadt    85:                }
                     86:                alarm(0);
                     87:                if (FD < 0) {
                     88:                        perror(cp);
                     89:                        deadfl = 1;
                     90:                }
                     91:                if (!deadfl) {
1.2       deraadt    92:                        struct termios cntrl;
                     93:
                     94:                        tcgetattr(FD, &cntrl);
1.5       millert    95:                        if (!boolean(value(DC)))
                     96:                                cntrl.c_cflag |= HUPCL;
1.2       deraadt    97:                        tcsetattr(FD, TCSAFLUSH, &cntrl);
1.1       deraadt    98:                        ioctl(FD, TIOCEXCL, 0);
                     99:                        signal(SIGALRM, SIG_DFL);
                    100:                        return ((long)cp);
                    101:                }
                    102:                (void)uu_unlock(uucplock);
                    103:        }
                    104:        signal(SIGALRM, f);
                    105:        return (deadfl ? -1 : (long)cp);
                    106: }