3 /* config - Dictionary where the type of each cell is provided. */
5 /* This is useful to build named structs, like option or property sets. */
7 /* Copyright (c) 2001,2002,2003,2004 Martin Quinson. All rights reserved. */
9 /* This program is free software; you can redistribute it and/or modify it
10 * under the terms of the license (GNU LGPL) which comes with this package. */
12 #ifndef _XBT_CONFIG_H_
13 #define _XBT_CONFIG_H_
15 #include "xbt/dynar.h"
19 /** @addtogroup XBT_config
20 * @brief Changing the configuration of SimGrid components (grounding feature)
22 * All modules of the SimGrid toolkit can be configured with this API.
23 * User modules and libraries can also use these facilities to handle
24 * their own configuration.
26 * A configuration set contain several \e variables which have a unique name
27 * in the set and can take a given type of value. For example, it may
28 * contain a \a size variable, accepting \e int values.
30 * It is impossible to set a value to a variable which has not been registered before.
31 * Usually, the module registers all the options it accepts in the configuration set,
32 * during its initialization and user code then set and unset values.
34 * The easiest way to register a variable is to use the xbt_str_register_str function,
35 * which accepts a string representation of the config element descriptor. The syntax
36 * is the following: \verbatim <name>:<min nb>_to_<max nb>_<type>\endverbatim
38 * For example, <tt>size:1_to_1_int</tt> describes a variable called \e size which
39 * must take exactly one value, and the value being an integer. Set the maximum to 0 to
40 * disable the upper bound on data count.
42 * Another example could be <tt>outputfiles:0_to_10_string</tt> which describes a variable
43 * called \e outputfiles and which can take between 0 and 10 strings as value.
45 * To some extend, configuration sets can be seen as typed hash structures.
47 * \todo This great mechanism is not used in SimGrid yet...
50 * \section XBT_cfg_ex Example of use
52 * \dontinclude config.c
54 * First, let's create a configuration set with some registered variables.
55 * This must be done by the configurable library before the user interactions.
58 * \until end_of_make_set
60 * Now, set and get a single value
61 * \skip get_single_value
65 * And now, set and get a multiple value
66 * \skip get_multiple_value
70 * All those functions throws mismatch_error if asked to deal with an
71 * unregistered variable.
76 /** @defgroup XBT_cfg_use User interface: changing values
79 * This is the only interface you should use unless you want to let your
80 * own code become configurable with this.
82 * If the variable accept at most one value, those functions replace the
83 * current value with the provided one. If max>1, the provided value is
84 * appended to the list.
86 * string values are strdup'ed before use, so you can (and should) free
91 /** @brief Configuration set are only special dynars. But don't rely on it, it may change. */
92 typedef xbt_dynar_t xbt_cfg_t;
94 XBT_PUBLIC(void) xbt_cfg_set(xbt_cfg_t cfg, const char *name, ...);
95 XBT_PUBLIC(void) xbt_cfg_set_vargs(xbt_cfg_t cfg, const char *name,
97 XBT_PUBLIC(void) xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options);
101 Set the value of the cell \a name in \a cfg with the provided value.
103 XBT_PUBLIC(void) xbt_cfg_set_int(xbt_cfg_t cfg, const char *name, int val);
104 XBT_PUBLIC(void) xbt_cfg_set_double(xbt_cfg_t cfg, const char *name,
106 XBT_PUBLIC(void) xbt_cfg_set_string(xbt_cfg_t cfg, const char *name,
108 XBT_PUBLIC(void) xbt_cfg_set_peer(xbt_cfg_t cfg, const char *name,
109 const char *peer, int port);
112 Remove the provided value from the cell @name in @cfg.
114 XBT_PUBLIC(void) xbt_cfg_rm_int(xbt_cfg_t cfg, const char *name, int val);
115 XBT_PUBLIC(void) xbt_cfg_rm_double(xbt_cfg_t cfg, const char *name,
117 XBT_PUBLIC(void) xbt_cfg_rm_string(xbt_cfg_t cfg, const char *name,
119 XBT_PUBLIC(void) xbt_cfg_rm_peer(xbt_cfg_t cfg, const char *name,
120 const char *peer, int port);
123 Remove the value at position \e pos from the config \e cfg
125 XBT_PUBLIC(void) xbt_cfg_rm_at(xbt_cfg_t cfg, const char *name, int pos);
127 /* rm every values */
128 XBT_PUBLIC(void) xbt_cfg_empty(xbt_cfg_t cfg, const char *name);
132 /** @defgroup XBT_cfg_decl Configuration type declaration and memory management
133 * @ingroup XBT_config
138 /** @brief possible content of each configuration cell */
146 xbt_cfgelm_peer,/**< both a char* (representing the peername) and an integer (representing the port) */
148 xbt_cfgelm_any, /* not shown to users to prevent errors */
149 xbt_cfgelm_type_count
150 } e_xbt_cfgelm_type_t;
152 /** \brief Callback types. They get the name of the modified entry, and the position of the changed value */
153 typedef void (*xbt_cfg_cb_t) (const char *, int);
155 XBT_PUBLIC(xbt_cfg_t) xbt_cfg_new(void);
156 XBT_PUBLIC(void) xbt_cfg_cpy(xbt_cfg_t tocopy, /* OUT */ xbt_cfg_t * whereto);
157 XBT_PUBLIC(void) xbt_cfg_free(xbt_cfg_t * cfg);
158 XBT_PUBLIC(void) xbt_cfg_dump(const char *name, const char *indent,
163 /** @defgroup XBT_cfg_register Registering stuff
164 * @ingroup XBT_config
166 * This how to add new variables to an existing configuration set. Use it to make your code
171 XBT_PUBLIC(void) xbt_cfg_register(xbt_cfg_t cfg,
172 const char *name, e_xbt_cfgelm_type_t type,
174 xbt_cfg_cb_t cb_set, xbt_cfg_cb_t cb_rm);
175 XBT_PUBLIC(void) xbt_cfg_unregister(xbt_cfg_t cfg, const char *name);
176 XBT_PUBLIC(void) xbt_cfg_register_str(xbt_cfg_t cfg, const char *entry);
177 XBT_PUBLIC(void) xbt_cfg_check(xbt_cfg_t cfg);
178 XBT_PUBLIC(e_xbt_cfgelm_type_t) xbt_cfg_get_type(xbt_cfg_t cfg,
181 /** @defgroup XBT_cfg_get Getting the stored values
182 * @ingroup XBT_config
184 * This is how to retrieve the values stored in the configuration set. This is only
185 * intended to configurable code, naturally.
187 * Note that those function return a pointer to the values actually stored
188 * in the set. Do not modify them unless you really know what you're doing.
189 * Likewise, do not free the strings after use, they are not copy of the data,
190 * but the data themselves.
195 XBT_PUBLIC(int) xbt_cfg_get_int(xbt_cfg_t cfg, const char *name);
196 XBT_PUBLIC(double) xbt_cfg_get_double(xbt_cfg_t cfg, const char *name);
197 XBT_PUBLIC(char *) xbt_cfg_get_string(xbt_cfg_t cfg, const char *name);
198 XBT_PUBLIC(void) xbt_cfg_get_peer(xbt_cfg_t cfg, const char *name,
199 char **peer, int *port);
200 XBT_PUBLIC(xbt_dynar_t) xbt_cfg_get_dynar(xbt_cfg_t cfg, const char *name);
202 XBT_PUBLIC(int) xbt_cfg_get_int_at(xbt_cfg_t cfg, const char *name, int pos);
203 XBT_PUBLIC(double) xbt_cfg_get_double_at(xbt_cfg_t cfg, const char *name,
205 XBT_PUBLIC(char *) xbt_cfg_get_string_at(xbt_cfg_t cfg, const char *name,
207 XBT_PUBLIC(void) xbt_cfg_get_peer_at(xbt_cfg_t cfg, const char *name, int pos,
208 char **peer, int *port);
213 #endif /* _XBT_CONFIG_H_ */