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Annotation of src/usr.bin/tip/hunt.c, Revision 1.19

1.19    ! nicm        1: /*     $OpenBSD: hunt.c,v 1.18 2010/07/02 05:52:48 nicm 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:
1.16      nicm       33: #include <util.h>
                     34:
1.1       deraadt    35: #include "tip.h"
                     36:
1.18      nicm       37: static jmp_buf deadline;
                     38: static int     deadflag;
1.1       deraadt    39:
1.12      moritz     40: static void    dead(int);
                     41:
1.13      deraadt    42: /*ARGSUSED*/
1.12      moritz     43: static void
1.11      deraadt    44: dead(int signo)
1.1       deraadt    45: {
1.18      nicm       46:        deadflag = 1;
1.1       deraadt    47:        longjmp(deadline, 1);
                     48: }
                     49:
1.18      nicm       50: /* Find and open the host. Returns the fd, or exits on error. */
                     51: int
                     52: hunt(char *hosts)
1.1       deraadt    53: {
1.18      nicm       54:        char           *copy, *last, *host, *device;
                     55:        struct termios  tio;
                     56:        int             fd, tried;
                     57:        sig_t           old_alrm;
                     58:
                     59:        if (hosts == NULL) {
                     60:                hosts = getenv("HOST");
                     61:                if (hosts == NULL)
                     62:                        errx(3, "no host specified");
                     63:        }
                     64:
                     65:        if ((copy = strdup(hosts)) == NULL)
                     66:                err(1, "strdup");
                     67:        last = copy;
                     68:
                     69:        old_alrm = signal(SIGALRM, dead);
1.1       deraadt    70:
1.18      nicm       71:        tried = 0;
                     72:        while ((host = strsep(&last, ",")) != NULL) {
                     73:                device = getremote(host);
                     74:
                     75:                uucplock = strrchr(device, '/');
1.7       deraadt    76:                if (uucplock == NULL)
1.18      nicm       77:                        uucplock = strdup(device);
1.7       deraadt    78:                else
1.18      nicm       79:                        uucplock = strdup(uucplock + 1);
                     80:                if (uucplock == NULL)
                     81:                        err(1, "strdup");
1.16      nicm       82:                if (uu_lock(uucplock) != UU_LOCK_OK)
1.1       deraadt    83:                        continue;
1.15      nicm       84:
1.18      nicm       85:                deadflag = 0;
1.1       deraadt    86:                if (setjmp(deadline) == 0) {
                     87:                        alarm(10);
1.18      nicm       88:
                     89:                        fd = open(device,
                     90:                            O_RDWR | (vgetnum(DC) ? O_NONBLOCK : 0));
                     91:                        if (fd < 0)
1.19    ! nicm       92:                                perror(device);
1.1       deraadt    93:                }
                     94:                alarm(0);
1.2       deraadt    95:
1.18      nicm       96:                tried++;
                     97:                if (fd >= 0 && !deadflag) {
                     98:                        tcgetattr(fd, &tio);
1.17      nicm       99:                        if (!vgetnum(DC))
1.18      nicm      100:                                tio.c_cflag |= HUPCL;
                    101:                        if (tcsetattr(fd, TCSAFLUSH, &tio) != 0)
                    102:                                errx(1, "tcsetattr");
                    103:
                    104:                        if (ioctl(fd, TIOCEXCL) != 0)
                    105:                                errx(1, "ioctl");
                    106:
                    107:                        signal(SIGALRM, old_alrm);
                    108:                        return (fd);
1.1       deraadt   109:                }
1.15      nicm      110:
1.18      nicm      111:                uu_unlock(uucplock);
                    112:                free(uucplock);
                    113:        }
                    114:        free(copy);
                    115:
                    116:        signal(SIGALRM, old_alrm);
                    117:        if (tried == 0) {
                    118:                printf("all ports busy\n");
                    119:                exit(3);
1.1       deraadt   120:        }
1.18      nicm      121:        printf("link down\n");
                    122:        exit(3);
1.1       deraadt   123: }