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Annotation of src/usr.bin/tip/hunt.c, Revision 1.18

1.18    ! nicm        1: /*     $OpenBSD: hunt.c,v 1.17 2010/07/01 21:28:01 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)
        !            92:                                perror(host);
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: }