func_global.c File Reference

Global variable dialplan functions. More...

#include "asterisk.h"
#include <sys/stat.h>
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/channel.h"
#include "asterisk/app.h"
#include "asterisk/stasis_channels.h"

Include dependency graph for func_global.c:

Go to the source code of this file.

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	global_delete_write (struct ast_channel *chan, const char *cmd, char *data, const char *value)
static int	global_exists_read (struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
static int	global_read (struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
static int	global_write (struct ast_channel *chan, const char *cmd, char *data, const char *value)
static int	load_module (void)
static int	shared_read (struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
static void	shared_variable_free (void *data)
static int	shared_write (struct ast_channel *chan, const char *cmd, char *data, const char *value)
static int	unload_module (void)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Variable dialplan functions" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_custom_function	global_delete_function
static struct ast_custom_function	global_exists_function
static struct ast_custom_function	global_function
static struct ast_custom_function	shared_function
static const struct ast_datastore_info	shared_variable_info

Detailed Description

Global variable dialplan functions.

Author

Tilghman Lesher func_.nosp@m.glob.nosp@m.al__2.nosp@m.0060.nosp@m.5@the.nosp@m.-til.nosp@m.ghman.nosp@m..com

Definition in file func_global.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 415 of file func_global.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 415 of file func_global.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 415 of file func_global.c.

global_delete_write()

static int global_delete_write ( struct ast_channel *  chan, const char *  cmd, char *  data, const char *  value  )

static

Definition at line 201 of file func_global.c.

{
    pbx_builtin_setvar_helper(NULL, data, NULL);
 
    return 0;
}

References NULL, and pbx_builtin_setvar_helper().

global_exists_read()

static int global_exists_read ( struct ast_channel *  chan, const char *  cmd, char *  data, char *  buf, size_t  len  )

static

Definition at line 213 of file func_global.c.

{
    const char *var = pbx_builtin_getvar_helper(NULL, data);
 
    strcpy(buf, var ? "1" : "0");
 
    return 0;
}

References buf, NULL, pbx_builtin_getvar_helper(), and var.

global_read()

static int global_read ( struct ast_channel *  chan, const char *  cmd, char *  data, char *  buf, size_t  len  )

static

Definition at line 176 of file func_global.c.

{
    const char *var = pbx_builtin_getvar_helper(NULL, data);
 
    *buf = '\0';
 
    if (var)
        ast_copy_string(buf, var, len);
 
    return 0;
}

References ast_copy_string(), buf, len(), NULL, pbx_builtin_getvar_helper(), and var.

global_write()

static int global_write ( struct ast_channel *  chan, const char *  cmd, char *  data, const char *  value  )

static

Definition at line 188 of file func_global.c.

{
    pbx_builtin_setvar_helper(NULL, data, value);
 
    return 0;
}

References NULL, pbx_builtin_setvar_helper(), and value.

load_module()

static int load_module ( void  )

static

Definition at line 403 of file func_global.c.

{
    int res = 0;
 
    res |= ast_custom_function_register(&global_function);
    res |= ast_custom_function_register(&global_delete_function);
    res |= ast_custom_function_register(&global_exists_function);
    res |= ast_custom_function_register(&shared_function);
 
    return res;
}

References ast_custom_function_register, global_delete_function, global_exists_function, global_function, and shared_function.

shared_read()

static int shared_read ( struct ast_channel *  chan, const char *  cmd, char *  data, char *  buf, size_t  len  )

static

Definition at line 228 of file func_global.c.

{
    struct ast_datastore *varstore;
    struct varshead *varshead;
    struct ast_var_t *var;
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(var);
        AST_APP_ARG(chan);
    );
    struct ast_channel *c_ref = NULL;
 
    if (ast_strlen_zero(data)) {
        ast_log(LOG_WARNING, "SHARED() requires an argument: SHARED(<var>[,<chan>])\n");
        return -1;
    }
 
    AST_STANDARD_APP_ARGS(args, data);
 
    if (!ast_strlen_zero(args.chan)) {
        char *prefix = ast_alloca(strlen(args.chan) + 2);
        sprintf(prefix, "%s-", args.chan);
        if (!(c_ref = ast_channel_get_by_name(args.chan)) && !(c_ref = ast_channel_get_by_name_prefix(prefix, strlen(prefix)))) {
            ast_log(LOG_ERROR, "Channel '%s' not found!  Variable '%s' will be blank.\n", args.chan, args.var);
            return -1;
        }
        chan = c_ref;
    } else if (!chan) {
        ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
        return -1;
    }
 
    ast_channel_lock(chan);
 
    if (!(varstore = ast_channel_datastore_find(chan, &shared_variable_info, NULL))) {
        ast_channel_unlock(chan);
        if (c_ref) {
            c_ref = ast_channel_unref(c_ref);
        }
        return -1;
    }
 
    varshead = varstore->data;
    *buf = '\0';
 
    /* Protected by the channel lock */
    AST_LIST_TRAVERSE(varshead, var, entries) {
        if (!strcmp(args.var, ast_var_name(var))) {
            ast_copy_string(buf, ast_var_value(var), len);
            break;
        }
    }
 
    ast_channel_unlock(chan);
 
    if (c_ref) {
        c_ref = ast_channel_unref(c_ref);
    }
 
    return 0;
}

References args, ast_alloca, AST_APP_ARG, ast_channel_datastore_find(), ast_channel_get_by_name(), ast_channel_get_by_name_prefix(), ast_channel_lock, ast_channel_unlock, ast_channel_unref, ast_copy_string(), AST_DECLARE_APP_ARGS, AST_LIST_TRAVERSE, ast_log, AST_STANDARD_APP_ARGS, ast_strlen_zero(), ast_var_name(), ast_var_value(), buf, ast_datastore::data, ast_channel::data, len(), LOG_ERROR, LOG_WARNING, NULL, prefix, shared_variable_info, and var.

shared_variable_free()

static void shared_variable_free ( void *  data )

static

Definition at line 165 of file func_global.c.

{
    struct varshead *varshead = data;
    struct ast_var_t *var;
 
    while ((var = AST_LIST_REMOVE_HEAD(varshead, entries))) {
        ast_var_delete(var);
    }
    ast_free(varshead);
}

References ast_free, AST_LIST_REMOVE_HEAD, ast_var_delete(), ast_var_t::entries, and var.

shared_write()

static int shared_write ( struct ast_channel *  chan, const char *  cmd, char *  data, const char *  value  )

static

Definition at line 289 of file func_global.c.

{
    struct ast_datastore *varstore;
    struct varshead *varshead;
    struct ast_var_t *var;
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(var);
        AST_APP_ARG(chan);
    );
    struct ast_channel *c_ref = NULL;
    int len;
    RAII_VAR(char *, shared_buffer, NULL, ast_free);
 
    if (ast_strlen_zero(data)) {
        ast_log(LOG_WARNING, "SHARED() requires an argument: SHARED(<var>[,<chan>])\n");
        return -1;
    }
 
    AST_STANDARD_APP_ARGS(args, data);
 
    if (!ast_strlen_zero(args.chan)) {
        char *prefix = ast_alloca(strlen(args.chan) + 2);
        sprintf(prefix, "%s-", args.chan);
        if (!(c_ref = ast_channel_get_by_name(args.chan)) && !(c_ref = ast_channel_get_by_name_prefix(prefix, strlen(prefix)))) {
            ast_log(LOG_ERROR, "Channel '%s' not found!  Variable '%s' not set to '%s'.\n", args.chan, args.var, value);
            return -1;
        }
        chan = c_ref;
    } else if (!chan) {
        ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
        return -1;
    }
 
    len = 9 + strlen(args.var); /* SHARED() + var */
    shared_buffer = ast_malloc(len);
    if (!shared_buffer) {
        if (c_ref) {
            ast_channel_unref(c_ref);
        }
        return -1;
    }
 
    ast_channel_lock(chan);
 
    if (!(varstore = ast_channel_datastore_find(chan, &shared_variable_info, NULL))) {
        if (!(varstore = ast_datastore_alloc(&shared_variable_info, NULL))) {
            ast_log(LOG_ERROR, "Unable to allocate new datastore.  Shared variable not set.\n");
            ast_channel_unlock(chan);
            if (c_ref) {
                c_ref = ast_channel_unref(c_ref);
            }
            return -1;
        }
 
        if (!(varshead = ast_calloc(1, sizeof(*varshead)))) {
            ast_log(LOG_ERROR, "Unable to allocate variable structure.  Shared variable not set.\n");
            ast_datastore_free(varstore);
            ast_channel_unlock(chan);
            if (c_ref) {
                c_ref = ast_channel_unref(c_ref);
            }
            return -1;
        }
 
        varstore->data = varshead;
        ast_channel_datastore_add(chan, varstore);
    }
    varshead = varstore->data;
 
    /* Protected by the channel lock */
    AST_LIST_TRAVERSE_SAFE_BEGIN(varshead, var, entries) {
        /* If there's a previous value, remove it */
        if (!strcmp(args.var, ast_var_name(var))) {
            AST_LIST_REMOVE_CURRENT(entries);
            ast_var_delete(var);
            break;
        }
    }
    AST_LIST_TRAVERSE_SAFE_END;
 
    if ((var = ast_var_assign(args.var, S_OR(value, "")))) {
        AST_LIST_INSERT_HEAD(varshead, var, entries);
 
        sprintf(shared_buffer, "SHARED(%s)", args.var);
        ast_channel_publish_varset(chan, shared_buffer, value);
    }
 
    ast_channel_unlock(chan);
 
    if (c_ref) {
        c_ref = ast_channel_unref(c_ref);
    }
 
    return 0;
}

References args, ast_alloca, AST_APP_ARG, ast_calloc, ast_channel_datastore_add(), ast_channel_datastore_find(), ast_channel_get_by_name(), ast_channel_get_by_name_prefix(), ast_channel_lock, ast_channel_publish_varset(), ast_channel_unlock, ast_channel_unref, ast_datastore_alloc, ast_datastore_free(), AST_DECLARE_APP_ARGS, ast_free, AST_LIST_INSERT_HEAD, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_log, ast_malloc, AST_STANDARD_APP_ARGS, ast_strlen_zero(), ast_var_assign, ast_var_delete(), ast_var_name(), ast_datastore::data, ast_channel::data, len(), LOG_ERROR, LOG_WARNING, NULL, prefix, RAII_VAR, S_OR, shared_variable_info, value, var, and ast_channel::varshead.

unload_module()

static int unload_module ( void  )

static

Definition at line 391 of file func_global.c.

{
    int res = 0;
 
    res |= ast_custom_function_unregister(&global_function);
    res |= ast_custom_function_unregister(&global_delete_function);
    res |= ast_custom_function_unregister(&global_exists_function);
    res |= ast_custom_function_unregister(&shared_function);
 
    return res;
}

References ast_custom_function_unregister(), global_delete_function, global_exists_function, global_function, and shared_function.

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Variable dialplan functions" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }

static

Definition at line 415 of file func_global.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 415 of file func_global.c.

global_delete_function

struct ast_custom_function global_delete_function

static

Initial value:

= {
    .name = "GLOBAL_DELETE",
    .write = global_delete_write,
}

Definition at line 208 of file func_global.c.

Referenced by load_module(), and unload_module().

global_exists_function

struct ast_custom_function global_exists_function

static

Initial value:

= {
    .name = "GLOBAL_EXISTS",
    .read = global_exists_read,
}

Definition at line 223 of file func_global.c.

Referenced by load_module(), and unload_module().

global_function

struct ast_custom_function global_function

static

Initial value:

= {
    .name = "GLOBAL",
    .read = global_read,
    .write = global_write,
}

Definition at line 195 of file func_global.c.

Referenced by load_module(), and unload_module().

shared_function

struct ast_custom_function shared_function

static

Initial value:

= {
    .name = "SHARED",
    .read = shared_read,
    .write = shared_write,
}

Definition at line 385 of file func_global.c.

Referenced by load_module(), and unload_module().

shared_variable_info

const struct ast_datastore_info shared_variable_info

static

Initial value:

= {
    .type = "SHARED_VARIABLES",
    .destroy = shared_variable_free,
}

Definition at line 160 of file func_global.c.

Referenced by shared_read(), and shared_write().