external/gpl2/lvm2/dist/lib/config/config.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is part of LVM2.
   8  *
   9  * This copyrighted material is made available to anyone wishing to use,
  10  * modify, copy, or redistribute it subject to the terms and conditions
  11  * of the GNU Lesser General Public License v.2.1.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #ifndef _LVM_CONFIG_H
  19 #define _LVM_CONFIG_H
  20
  21 #include "lvm-types.h"
  22
  23 struct device;
  24 struct cmd_context;
  25
  26 enum {
  27         CFG_STRING,
  28         CFG_FLOAT,
  29         CFG_INT,
  30         CFG_EMPTY_ARRAY
  31 };
  32
  33 struct config_value {
  34         int type;
  35         union {
  36                 int64_t i;
  37                 float r;
  38                 char *str;
  39         } v;
  40         struct config_value *next;      /* for arrays */
  41 };
  42
  43 struct config_node {
  44         char *key;
  45         struct config_node *parent, *sib, *child;
  46         struct config_value *v;
  47 };
  48
  49 struct config_tree {
  50         struct config_node *root;
  51 };
  52
  53 struct config_tree_list {
  54         struct dm_list list;
  55         struct config_tree *cft;
  56 };
  57
  58 struct config_tree *create_config_tree(const char *filename, int keep_open);
  59 struct config_tree *create_config_tree_from_string(struct cmd_context *cmd,
  60                                                    const char *config_settings);
  61 int override_config_tree_from_string(struct cmd_context *cmd,
  62                                      const char *config_settings);
  63 void destroy_config_tree(struct config_tree *cft);
  64
  65 typedef uint32_t (*checksum_fn_t) (uint32_t initial, const void *buf, uint32_t size);
  66
  67 int read_config_fd(struct config_tree *cft, struct device *dev,
  68                    off_t offset, size_t size, off_t offset2, size_t size2,
  69                    checksum_fn_t checksum_fn, uint32_t checksum);
  70
  71 int read_config_file(struct config_tree *cft);
  72 int write_config_file(struct config_tree *cft, const char *file,
  73                       int argc, char **argv);
  74
  75 typedef int (*putline_fn)(const char *line, void *baton);
  76 int write_config_node(const struct config_node *cn, putline_fn putline, void *baton);
  77
  78 time_t config_file_timestamp(struct config_tree *cft);
  79 int config_file_changed(struct config_tree *cft);
  80 int merge_config_tree(struct cmd_context *cmd, struct config_tree *cft,
  81                       struct config_tree *newdata);
  82
  83 struct config_node *find_config_node(const struct config_node *cn,
  84                                      const char *path);
  85 const char *find_config_str(const struct config_node *cn, const char *path,
  86                             const char *fail);
  87 int find_config_int(const struct config_node *cn, const char *path, int fail);
  88 float find_config_float(const struct config_node *cn, const char *path,
  89                         float fail);
  90
  91 /*
  92  * These versions check an override tree, if present, first.
  93  */
  94 struct config_node *find_config_tree_node(struct cmd_context *cmd,
  95                                           const char *path);
  96 const char *find_config_tree_str(struct cmd_context *cmd,
  97                                  const char *path, const char *fail);
  98 int find_config_tree_int(struct cmd_context *cmd, const char *path,
  99                          int fail);
 100 float find_config_tree_float(struct cmd_context *cmd, const char *path,
 101                              float fail);
 102
 103 /*
 104  * Understands (0, ~0), (y, n), (yes, no), (on,
 105  * off), (true, false).
 106  */
 107 int find_config_bool(const struct config_node *cn, const char *path, int fail);
 108 int find_config_tree_bool(struct cmd_context *cmd, const char *path, int fail);
 109
 110 int get_config_uint32(const struct config_node *cn, const char *path,
 111                       uint32_t *result);
 112
 113 int get_config_uint64(const struct config_node *cn, const char *path,
 114                       uint64_t *result);
 115
 116 int get_config_str(const struct config_node *cn, const char *path,
 117                    char **result);
 118
 119 unsigned maybe_config_section(const char *str, unsigned len);
 120
 121 const char *config_parent_name(const struct config_node *n);
 122
 123 struct config_node *clone_config_node(struct dm_pool *mem, const struct config_node *cn,
 124                                       int siblings);
 125 #endif