usr/src/cmd/devfsadm/tape_link.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 #include <devfsadm.h>
  29 #include <strings.h>
  30 #include <stdlib.h>
  31 #include <limits.h>
  32
  33 static int tape_process(di_minor_t minor, di_node_t node);
  34
  35 static devfsadm_create_t tape_cbt[] = {
  36         { "tape", "ddi_byte:tape", NULL,
  37         TYPE_EXACT, ILEVEL_0,   tape_process
  38         },
  39 };
  40
  41 DEVFSADM_CREATE_INIT_V0(tape_cbt);
  42
  43 #define TAPE_LINK_RE "^rmt/[0-9]+[cbhlmnu]*"
  44
  45 static devfsadm_remove_t tape_remove_cbt[] = {
  46         { "tape", TAPE_LINK_RE, RM_PRE, ILEVEL_0, devfsadm_rm_all
  47         }
  48 };
  49
  50 DEVFSADM_REMOVE_INIT_V0(tape_remove_cbt);
  51
  52
  53 /*
  54  * This function is called for every tape minor node.
  55  * Calls enumerate to assign a logical tape id, and then
  56  * devfsadm_mklink to make the link.
  57  */
  58 static int
  59 tape_process(di_minor_t minor, di_node_t node)
  60 {
  61         int flags = 0;
  62         char l_path[PATH_MAX + 1];
  63         char *buf;
  64         char *mn;
  65         char *devfspath;
  66         devfsadm_enumerate_t rules[1] = {"rmt/([0-9]+)", 1, MATCH_ADDR};
  67
  68         mn = di_minor_name(minor);
  69
  70
  71         if ((mn != NULL) && (*mn >= '0') && (*mn <= '9')) {
  72                 /*
  73                  * first character cannot be a digit as it would combine
  74                  * with the tape instance number to make an ambiguous quantity.
  75                  */
  76                 return (DEVFSADM_CONTINUE);
  77         }
  78
  79         devfspath = di_devfs_path(node);
  80
  81         (void) strcpy(l_path, devfspath);
  82         (void) strcat(l_path, ":");
  83         (void) strcat(l_path, mn);
  84
  85         di_devfs_path_free(devfspath);
  86
  87         /*
  88          *  devfsadm_enumerate finds the logical tape id from the physical path,
  89          *  omitting minor name field. The logical tape id is returned in buf.
  90          */
  91         if (devfsadm_enumerate_int(l_path, 0, &buf, rules, 1)) {
  92                 return (DEVFSADM_CONTINUE);
  93         }
  94
  95         (void) strcpy(l_path, "rmt/");
  96         (void) strcat(l_path, buf);
  97         (void) strcat(l_path, mn);
  98         free(buf);
  99
 100         (void) devfsadm_mklink(l_path, node, minor, flags);
 101
 102         return (DEVFSADM_CONTINUE);
 103 }