cmd/zpool/zpool_util.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 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <errno.h>
  27 #include <libgen.h>
  28 #include <libintl.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <strings.h>
  32
  33 #include "zpool_util.h"
  34
  35 /*
  36  * Utility function to guarantee malloc() success.
  37  */
  38 void *
  39 safe_malloc(size_t size)
  40 {
  41         void *data;
  42
  43         if ((data = calloc(1, size)) == NULL) {
  44                 (void) fprintf(stderr, "internal error: out of memory\n");
  45                 exit(1);
  46         }
  47
  48         return (data);
  49 }
  50
  51 /*
  52  * Display an out of memory error message and abort the current program.
  53  */
  54 void
  55 zpool_no_memory(void)
  56 {
  57         assert(errno == ENOMEM);
  58         (void) fprintf(stderr,
  59             gettext("internal error: out of memory\n"));
  60         exit(1);
  61 }
  62
  63 /*
  64  * Return the number of logs in supplied nvlist
  65  */
  66 uint_t
  67 num_logs(nvlist_t *nv)
  68 {
  69         uint_t nlogs = 0;
  70         uint_t c, children;
  71         nvlist_t **child;
  72
  73         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
  74             &child, &children) != 0)
  75                 return (0);
  76
  77         for (c = 0; c < children; c++) {
  78                 uint64_t is_log = B_FALSE;
  79
  80                 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
  81                     &is_log);
  82                 if (is_log)
  83                         nlogs++;
  84         }
  85         return (nlogs);
  86 }