/usr/include/zhash.h is in libczmq-dev 4.0.2-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | /* =========================================================================
zhash - generic type-free hash container (simple)
Copyright (c) the Contributors as noted in the AUTHORS file.
This file is part of CZMQ, the high-level C binding for 0MQ:
http://czmq.zeromq.org.
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
=========================================================================
*/
#ifndef __ZHASH_H_INCLUDED__
#define __ZHASH_H_INCLUDED__
#ifdef __cplusplus
extern "C" {
#endif
// @warning THE FOLLOWING @INTERFACE BLOCK IS AUTO-GENERATED BY ZPROJECT
// @warning Please edit the model at "api/zhash.api" to make changes.
// @interface
// This is a stable class, and may not change except for emergencies. It
// is provided in stable builds.
// Callback function for zhash_freefn method
typedef void (zhash_free_fn) (
void *data);
// Create a new, empty hash container
CZMQ_EXPORT zhash_t *
zhash_new (void);
// Unpack binary frame into a new hash table. Packed data must follow format
// defined by zhash_pack. Hash table is set to autofree. An empty frame
// unpacks to an empty hash table.
CZMQ_EXPORT zhash_t *
zhash_unpack (zframe_t *frame);
// Destroy a hash container and all items in it
CZMQ_EXPORT void
zhash_destroy (zhash_t **self_p);
// Insert item into hash table with specified key and item.
// If key is already present returns -1 and leaves existing item unchanged
// Returns 0 on success.
CZMQ_EXPORT int
zhash_insert (zhash_t *self, const char *key, void *item);
// Update item into hash table with specified key and item.
// If key is already present, destroys old item and inserts new one.
// Use free_fn method to ensure deallocator is properly called on item.
CZMQ_EXPORT void
zhash_update (zhash_t *self, const char *key, void *item);
// Remove an item specified by key from the hash table. If there was no such
// item, this function does nothing.
CZMQ_EXPORT void
zhash_delete (zhash_t *self, const char *key);
// Return the item at the specified key, or null
CZMQ_EXPORT void *
zhash_lookup (zhash_t *self, const char *key);
// Reindexes an item from an old key to a new key. If there was no such
// item, does nothing. Returns 0 if successful, else -1.
CZMQ_EXPORT int
zhash_rename (zhash_t *self, const char *old_key, const char *new_key);
// Set a free function for the specified hash table item. When the item is
// destroyed, the free function, if any, is called on that item.
// Use this when hash items are dynamically allocated, to ensure that
// you don't have memory leaks. You can pass 'free' or NULL as a free_fn.
// Returns the item, or NULL if there is no such item.
CZMQ_EXPORT void *
zhash_freefn (zhash_t *self, const char *key, zhash_free_fn free_fn);
// Return the number of keys/items in the hash table
CZMQ_EXPORT size_t
zhash_size (zhash_t *self);
// Make copy of hash table; if supplied table is null, returns null.
// Does not copy items themselves. Rebuilds new table so may be slow on
// very large tables. NOTE: only works with item values that are strings
// since there's no other way to know how to duplicate the item value.
// Caller owns return value and must destroy it when done.
CZMQ_EXPORT zhash_t *
zhash_dup (zhash_t *self);
// Return keys for items in table
// Caller owns return value and must destroy it when done.
CZMQ_EXPORT zlist_t *
zhash_keys (zhash_t *self);
// Simple iterator; returns first item in hash table, in no given order,
// or NULL if the table is empty. This method is simpler to use than the
// foreach() method, which is deprecated. To access the key for this item
// use zhash_cursor(). NOTE: do NOT modify the table while iterating.
CZMQ_EXPORT void *
zhash_first (zhash_t *self);
// Simple iterator; returns next item in hash table, in no given order,
// or NULL if the last item was already returned. Use this together with
// zhash_first() to process all items in a hash table. If you need the
// items in sorted order, use zhash_keys() and then zlist_sort(). To
// access the key for this item use zhash_cursor(). NOTE: do NOT modify
// the table while iterating.
CZMQ_EXPORT void *
zhash_next (zhash_t *self);
// After a successful first/next method, returns the key for the item that
// was returned. This is a constant string that you may not modify or
// deallocate, and which lasts as long as the item in the hash. After an
// unsuccessful first/next, returns NULL.
CZMQ_EXPORT const char *
zhash_cursor (zhash_t *self);
// Add a comment to hash table before saving to disk. You can add as many
// comment lines as you like. These comment lines are discarded when loading
// the file. If you use a null format, all comments are deleted.
CZMQ_EXPORT void
zhash_comment (zhash_t *self, const char *format, ...) CHECK_PRINTF (2);
// Serialize hash table to a binary frame that can be sent in a message.
// The packed format is compatible with the 'dictionary' type defined in
// http://rfc.zeromq.org/spec:35/FILEMQ, and implemented by zproto:
//
// ; A list of name/value pairs
// dictionary = dict-count *( dict-name dict-value )
// dict-count = number-4
// dict-value = longstr
// dict-name = string
//
// ; Strings are always length + text contents
// longstr = number-4 *VCHAR
// string = number-1 *VCHAR
//
// ; Numbers are unsigned integers in network byte order
// number-1 = 1OCTET
// number-4 = 4OCTET
//
// Comments are not included in the packed data. Item values MUST be
// strings.
// Caller owns return value and must destroy it when done.
CZMQ_EXPORT zframe_t *
zhash_pack (zhash_t *self);
// Save hash table to a text file in name=value format. Hash values must be
// printable strings; keys may not contain '=' character. Returns 0 if OK,
// else -1 if a file error occurred.
CZMQ_EXPORT int
zhash_save (zhash_t *self, const char *filename);
// Load hash table from a text file in name=value format; hash table must
// already exist. Hash values must printable strings; keys may not contain
// '=' character. Returns 0 if OK, else -1 if a file was not readable.
CZMQ_EXPORT int
zhash_load (zhash_t *self, const char *filename);
// When a hash table was loaded from a file by zhash_load, this method will
// reload the file if it has been modified since, and is "stable", i.e. not
// still changing. Returns 0 if OK, -1 if there was an error reloading the
// file.
CZMQ_EXPORT int
zhash_refresh (zhash_t *self);
// Set hash for automatic value destruction
CZMQ_EXPORT void
zhash_autofree (zhash_t *self);
// Self test of this class.
CZMQ_EXPORT void
zhash_test (bool verbose);
// @end
#ifdef __cplusplus
}
#endif
#endif
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