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asterisk/include/asterisk/pbx.h

886 lines
29 KiB
C

/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
* \brief Core PBX routines and definitions.
*/
#ifndef _ASTERISK_PBX_H
#define _ASTERISK_PBX_H
#include "asterisk/sched.h"
#include "asterisk/channel.h"
#include "asterisk/linkedlists.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#define AST_MAX_APP 32 /*!< Max length of an application */
#define AST_PBX_KEEP 0
#define AST_PBX_REPLACE 1
/*! \brief Special return values from applications to the PBX { */
#define AST_PBX_KEEPALIVE 10 /*!< Destroy the thread, but don't hang up the channel */
#define AST_PBX_NO_HANGUP_PEER 11
/*! } */
#define PRIORITY_HINT -1 /*!< Special Priority for a hint */
/*! \brief Extension states
\note States can be combined
- \ref AstExtState
*/
enum ast_extension_states {
AST_EXTENSION_REMOVED = -2, /*!< Extension removed */
AST_EXTENSION_DEACTIVATED = -1, /*!< Extension hint removed */
AST_EXTENSION_NOT_INUSE = 0, /*!< No device INUSE or BUSY */
AST_EXTENSION_INUSE = 1 << 0, /*!< One or more devices INUSE */
AST_EXTENSION_BUSY = 1 << 1, /*!< All devices BUSY */
AST_EXTENSION_UNAVAILABLE = 1 << 2, /*!< All devices UNAVAILABLE/UNREGISTERED */
AST_EXTENSION_RINGING = 1 << 3, /*!< All devices RINGING */
AST_EXTENSION_ONHOLD = 1 << 4, /*!< All devices ONHOLD */
};
struct ast_context;
struct ast_exten;
struct ast_include;
struct ast_ignorepat;
struct ast_sw;
/*! \brief Typedef for devicestate and hint callbacks */
typedef int (*ast_state_cb_type)(char *context, char* id, enum ast_extension_states state, void *data);
/*! \brief Data structure associated with a custom dialplan function */
struct ast_custom_function {
const char *name; /*!< Name */
const char *synopsis; /*!< Short description for "show functions" */
const char *desc; /*!< Help text that explains it all */
const char *syntax; /*!< Syntax description */
int (*read)(struct ast_channel *, const char *, char *, char *, size_t); /*!< Read function, if read is supported */
int (*write)(struct ast_channel *, const char *, char *, const char *); /*!< Write function, if write is supported */
AST_RWLIST_ENTRY(ast_custom_function) acflist;
};
/*! \brief All switch functions have the same interface, so define a type for them */
typedef int (ast_switch_f)(struct ast_channel *chan, const char *context,
const char *exten, int priority, const char *callerid, const char *data);
/*!< Data structure associated with an Asterisk switch */
struct ast_switch {
AST_LIST_ENTRY(ast_switch) list;
const char *name; /*!< Name of the switch */
const char *description; /*!< Description of the switch */
ast_switch_f *exists;
ast_switch_f *canmatch;
ast_switch_f *exec;
ast_switch_f *matchmore;
};
struct ast_timing {
int hastime; /*!< If time construct exists */
unsigned int monthmask; /*!< Mask for month */
unsigned int daymask; /*!< Mask for date */
unsigned int dowmask; /*!< Mask for day of week (mon-sun) */
unsigned int minmask[24]; /*!< Mask for minute */
};
int ast_build_timing(struct ast_timing *i, const char *info);
int ast_check_timing(const struct ast_timing *i);
struct ast_pbx {
int dtimeout; /*!< Timeout between digits (seconds) */
int rtimeout; /*!< Timeout for response (seconds) */
};
/*!
* \brief Register an alternative dialplan switch
*
* \param sw switch to register
*
* This function registers a populated ast_switch structure with the
* asterisk switching architecture.
*
* \return 0 on success, and other than 0 on failure
*/
int ast_register_switch(struct ast_switch *sw);
/*!
* \brief Unregister an alternative switch
*
* \param sw switch to unregister
*
* Unregisters a switch from asterisk.
*
* \return nothing
*/
void ast_unregister_switch(struct ast_switch *sw);
/*!
* \brief Look up an application
*
* \param app name of the app
*
* This function searches for the ast_app structure within
* the apps that are registered for the one with the name
* you passed in.
*
* \return the ast_app structure that matches on success, or NULL on failure
*/
struct ast_app *pbx_findapp(const char *app);
/*!
* \brief Execute an application
*
* \param c channel to execute on
* \param app which app to execute
* \param data the data passed into the app
*
* This application executes an application on a given channel. It
* saves the stack and executes the given application passing in
* the given data.
*
* \return 0 on success, and -1 on failure
*/
int pbx_exec(struct ast_channel *c, struct ast_app *app, void *data);
/*!
* \brief Register a new context
*
* \param extcontexts pointer to the ast_context structure pointer
* \param name name of the new context
* \param registrar registrar of the context
*
* This will first search for a context with your name. If it exists already, it will not
* create a new one. If it does not exist, it will create a new one with the given name
* and registrar.
*
* \return NULL on failure, and an ast_context structure on success
*/
struct ast_context *ast_context_create(struct ast_context **extcontexts, const char *name, const char *registrar);
/*!
* \brief Register a new context or find an existing one
*
* \param extcontexts pointer to the ast_context structure pointer
* \param name name of the new context
* \param registrar registrar of the context
*
* This will first search for a context with your name. If it exists already, it will not
* create a new one. If it does not exist, it will create a new one with the given name
* and registrar.
*
* \return NULL on failure, and an ast_context structure on success
*/
struct ast_context *ast_context_find_or_create(struct ast_context **extcontexts, const char *name, const char *registrar);
/*!
* \brief Merge the temporary contexts into a global contexts list and delete from the
* global list the ones that are being added
*
* \param extcontexts pointer to the ast_context structure pointer
* \param registrar of the context; if it's set the routine will delete all contexts
* that belong to that registrar; if NULL only the contexts that are specified
* in extcontexts
*/
void ast_merge_contexts_and_delete(struct ast_context **extcontexts, const char *registrar);
/*!
* \brief Destroy a context (matches the specified context (or ANY context if NULL)
*
* \param con context to destroy
* \param registrar who registered it
*
* You can optionally leave out either parameter. It will find it
* based on either the ast_context or the registrar name.
*
* \return nothing
*/
void ast_context_destroy(struct ast_context *con, const char *registrar);
/*!
* \brief Find a context
*
* \param name name of the context to find
*
* Will search for the context with the given name.
*
* \return the ast_context on success, NULL on failure.
*/
struct ast_context *ast_context_find(const char *name);
/*! \brief The result codes when starting the PBX on a channelwith \see ast_pbx_start.
AST_PBX_CALL_LIMIT refers to the maxcalls call limit in asterisk.conf
*/
enum ast_pbx_result {
AST_PBX_SUCCESS = 0,
AST_PBX_FAILED = -1,
AST_PBX_CALL_LIMIT = -2,
};
/*!
* \brief Create a new thread and start the PBX
*
* \param c channel to start the pbx on
*
* \see ast_pbx_run for a synchronous function to run the PBX in the
* current thread, as opposed to starting a new one.
*
* \retval Zero on success
* \retval non-zero on failure
*/
enum ast_pbx_result ast_pbx_start(struct ast_channel *c);
/*!
* \brief Execute the PBX in the current thread
*
* \param c channel to run the pbx on
*
* This executes the PBX on a given channel. It allocates a new
* PBX structure for the channel, and provides all PBX functionality.
* See ast_pbx_start for an asynchronous function to run the PBX in a
* new thread as opposed to the current one.
*
* \retval Zero on success
* \retval non-zero on failure
*/
enum ast_pbx_result ast_pbx_run(struct ast_channel *c);
/*!
* \brief Add and extension to an extension context.
*
* \param context context to add the extension to
* \param replace
* \param extension extension to add
* \param priority priority level of extension addition
* \param label extension label
* \param callerid pattern to match CallerID, or NULL to match any CallerID
* \param application application to run on the extension with that priority level
* \param data data to pass to the application
* \param datad
* \param registrar who registered the extension
*
* \retval 0 success
* \retval -1 failure
*/
int ast_add_extension(const char *context, int replace, const char *extension,
int priority, const char *label, const char *callerid,
const char *application, void *data, void (*datad)(void *), const char *registrar);
/*!
* \brief Add an extension to an extension context, this time with an ast_context *.
*
* \note For details about the arguments, check ast_add_extension()
*/
int ast_add_extension2(struct ast_context *con, int replace, const char *extension,
int priority, const char *label, const char *callerid,
const char *application, void *data, void (*datad)(void *), const char *registrar);
/*!
* \brief Register an application.
*
* \param app Short name of the application
* \param execute a function callback to execute the application. It should return
* non-zero if the channel needs to be hung up.
* \param synopsis a short description (one line synopsis) of the application
* \param description long description with all of the details about the use of
* the application
*
* This registers an application with Asterisk's internal application list.
* \note The individual applications themselves are responsible for registering and unregistering
* and unregistering their own CLI commands.
*
* \retval 0 success
* \retval -1 failure.
*/
int ast_register_application(const char *app, int (*execute)(struct ast_channel *, void *),
const char *synopsis, const char *description);
/*!
* \brief Unregister an application
*
* \param app name of the application (does not have to be the same string as the one that was registered)
*
* This unregisters an application from Asterisk's internal application list.
*
* \retval 0 success
* \retval -1 failure
*/
int ast_unregister_application(const char *app);
/*!
* \brief Uses hint and devicestate callback to get the state of an extension
*
* \param c this is not important
* \param context which context to look in
* \param exten which extension to get state
*
* \return extension state as defined in the ast_extension_states enum
*/
int ast_extension_state(struct ast_channel *c, const char *context, const char *exten);
/*!
* \brief Return string representation of the state of an extension
*
* \param extension_state is the numerical state delivered by ast_extension_state
*
* \return the state of an extension as string
*/
const char *ast_extension_state2str(int extension_state);
/*!
* \brief Registers a state change callback
*
* \param context which context to look in
* \param exten which extension to get state
* \param callback callback to call if state changed
* \param data to pass to callback
*
* The callback is called if the state of an extension is changed.
*
* \retval -1 on failure
* \retval ID on success
*/
int ast_extension_state_add(const char *context, const char *exten,
ast_state_cb_type callback, void *data);
/*!
* \brief Deletes a registered state change callback by ID
*
* \param id of the callback to delete
* \param callback callback
*
* Removes the callback from list of callbacks
*
* \retval 0 success
* \retval -1 failure
*/
int ast_extension_state_del(int id, ast_state_cb_type callback);
/*!
* \brief If an extension hint exists, return non-zero
*
* \param hint buffer for hint
* \param maxlen size of hint buffer
* \param name buffer for name portion of hint
* \param maxnamelen size of name buffer
* \param c this is not important
* \param context which context to look in
* \param exten which extension to search for
*
* \return If an extension within the given context with the priority PRIORITY_HINT
* is found a non zero value will be returned.
* Otherwise, 0 is returned.
*/
int ast_get_hint(char *hint, int maxlen, char *name, int maxnamelen,
struct ast_channel *c, const char *context, const char *exten);
/*!
* \brief Determine whether an extension exists
*
* \param c this is not important
* \param context which context to look in
* \param exten which extension to search for
* \param priority priority of the action within the extension
* \param callerid callerid to search for
*
* \return If an extension within the given context(or callerid) with the given priority
* is found a non zero value will be returned. Otherwise, 0 is returned.
*/
int ast_exists_extension(struct ast_channel *c, const char *context, const char *exten,
int priority, const char *callerid);
/*!
* \brief Find the priority of an extension that has the specified label
*
* \param c this is not important
* \param context which context to look in
* \param exten which extension to search for
* \param label label of the action within the extension to match to priority
* \param callerid callerid to search for
*
* \retval the priority which matches the given label in the extension
* \retval -1 if not found.
*/
int ast_findlabel_extension(struct ast_channel *c, const char *context,
const char *exten, const char *label, const char *callerid);
/*!
* \brief Find the priority of an extension that has the specified label
*
* \note This function is the same as ast_findlabel_extension, except that it accepts
* a pointer to an ast_context structure to specify the context instead of the
* name of the context. Otherwise, the functions behave the same.
*/
int ast_findlabel_extension2(struct ast_channel *c, struct ast_context *con,
const char *exten, const char *label, const char *callerid);
/*!
* \brief Looks for a valid matching extension
*
* \param c not really important
* \param context context to serach within
* \param exten extension to check
* \param priority priority of extension path
* \param callerid callerid of extension being searched for
*
* \return If "exten" *could be* a valid extension in this context with or without
* some more digits, return non-zero. Basically, when this returns 0, no matter
* what you add to exten, it's not going to be a valid extension anymore
*/
int ast_canmatch_extension(struct ast_channel *c, const char *context,
const char *exten, int priority, const char *callerid);
/*!
* \brief Looks to see if adding anything to this extension might match something. (exists ^ canmatch)
*
* \param c not really important XXX
* \param context context to serach within
* \param exten extension to check
* \param priority priority of extension path
* \param callerid callerid of extension being searched for
*
* \return If "exten" *could match* a valid extension in this context with
* some more digits, return non-zero. Does NOT return non-zero if this is
* an exact-match only. Basically, when this returns 0, no matter
* what you add to exten, it's not going to be a valid extension anymore
*/
int ast_matchmore_extension(struct ast_channel *c, const char *context,
const char *exten, int priority, const char *callerid);
/*!
* \brief Determine if a given extension matches a given pattern (in NXX format)
*
* \param pattern pattern to match
* \param extension extension to check against the pattern.
*
* Checks whether or not the given extension matches the given pattern.
*
* \retval 1 on match
* \retval 0 on failure
*/
int ast_extension_match(const char *pattern, const char *extension);
int ast_extension_close(const char *pattern, const char *data, int needmore);
/*!
* \brief Launch a new extension (i.e. new stack)
*
* \param c not important
* \param context which context to generate the extension within
* \param exten new extension to add
* \param priority priority of new extension
* \param callerid callerid of extension
*
* This adds a new extension to the asterisk extension list.
*
* \retval 0 on success
* \retval -1 on failure.
*/
int ast_spawn_extension(struct ast_channel *c, const char *context,
const char *exten, int priority, const char *callerid);
/*!
* \brief Add a context include
*
* \param context context to add include to
* \param include new include to add
* \param registrar who's registering it
*
* Adds an include taking a char * string as the context parameter
*
* \retval 0 on success
* \retval -1 on error
*/
int ast_context_add_include(const char *context, const char *include,
const char *registrar);
/*!
* \brief Add a context include
*
* \param con context to add the include to
* \param include include to add
* \param registrar who registered the context
*
* Adds an include taking a struct ast_context as the first parameter
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_add_include2(struct ast_context *con, const char *include,
const char *registrar);
/*!
* \brief Remove a context include
*
* \note See ast_context_add_include for information on arguments
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_remove_include(const char *context, const char *include,
const char *registrar);
/*!
* \brief Removes an include by an ast_context structure
*
* \note See ast_context_add_include2 for information on arguments
*
* \retval 0 on success
* \retval -1 on success
*/
int ast_context_remove_include2(struct ast_context *con, const char *include,
const char *registrar);
/*!
* \brief Verifies includes in an ast_contect structure
*
* \param con context in which to verify the includes
*
* \retval 0 if no problems found
* \retval -1 if there were any missing context
*/
int ast_context_verify_includes(struct ast_context *con);
/*!
* \brief Add a switch
*
* \param context context to which to add the switch
* \param sw switch to add
* \param data data to pass to switch
* \param eval whether to evaluate variables when running switch
* \param registrar whoever registered the switch
*
* This function registers a switch with the asterisk switch architecture
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_add_switch(const char *context, const char *sw, const char *data,
int eval, const char *registrar);
/*!
* \brief Adds a switch (first param is a ast_context)
*
* \note See ast_context_add_switch() for argument information, with the exception of
* the first argument. In this case, it's a pointer to an ast_context structure
* as opposed to the name.
*/
int ast_context_add_switch2(struct ast_context *con, const char *sw, const char *data,
int eval, const char *registrar);
/*!
* \brief Remove a switch
*
* Removes a switch with the given parameters
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_remove_switch(const char *context, const char *sw,
const char *data, const char *registrar);
int ast_context_remove_switch2(struct ast_context *con, const char *sw,
const char *data, const char *registrar);
/*!
* \brief Simply remove extension from context
*
* \param context context to remove extension from
* \param extension which extension to remove
* \param priority priority of extension to remove
* \param registrar registrar of the extension
*
* This function removes an extension from a given context.
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_remove_extension(const char *context, const char *extension, int priority,
const char *registrar);
int ast_context_remove_extension2(struct ast_context *con, const char *extension,
int priority, const char *registrar);
/*!
* \brief Add an ignorepat
*
* \param context which context to add the ignorpattern to
* \param ignorepat ignorepattern to set up for the extension
* \param registrar registrar of the ignore pattern
*
* Adds an ignore pattern to a particular context.
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_add_ignorepat(const char *context, const char *ignorepat, const char *registrar);
int ast_context_add_ignorepat2(struct ast_context *con, const char *ignorepat, const char *registrar);
/*
* \brief Remove an ignorepat
*
* \param context context from which to remove the pattern
* \param ignorepat the pattern to remove
* \param registrar the registrar of the ignore pattern
*
* This removes the given ignorepattern
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_remove_ignorepat(const char *context, const char *ignorepat, const char *registrar);
int ast_context_remove_ignorepat2(struct ast_context *con, const char *ignorepat, const char *registrar);
/*!
* \brief Checks to see if a number should be ignored
*
* \param context context to search within
* \param pattern to check whether it should be ignored or not
*
* Check if a number should be ignored with respect to dialtone cancellation.
*
* \retval 0 if the pattern should not be ignored
* \retval non-zero if the pattern should be ignored
*/
int ast_ignore_pattern(const char *context, const char *pattern);
/* Locking functions for outer modules, especially for completion functions */
/*!
* \brief Write locks the context list
*
* \retval 0 on success
* \retval -1 on error
*/
int ast_wrlock_contexts(void);
/*!
* \brief Read locks the context list
*
* \retval 0 on success
* \retval -1 on error
*/
int ast_rdlock_contexts(void);
/*!
* \brief Unlocks contexts
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_unlock_contexts(void);
/*!
* \brief Write locks a given context
*
* \param con context to lock
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_wrlock_context(struct ast_context *con);
/*!
* \brief Read locks a given context
*
* \param con context to lock
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_rdlock_context(struct ast_context *con);
/*!
* \retval Unlocks the given context
*
* \param con context to unlock
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_unlock_context(struct ast_context *con);
/*!
* \brief locks the macrolock in the given given context
*
* \param macrocontext name of the macro-context to lock
*
* Locks the given macro-context to ensure only one thread (call) can execute it at a time
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_lockmacro(const char *macrocontext);
/*!
* \brief Unlocks the macrolock in the given context
*
* \param macrocontext name of the macro-context to unlock
*
* Unlocks the given macro-context so that another thread (call) can execute it
*
* \retval 0 on success
* \retval -1 on failure
*/
int ast_context_unlockmacro(const char *macrocontext);
int ast_async_goto(struct ast_channel *chan, const char *context, const char *exten, int priority);
int ast_async_goto_by_name(const char *chan, const char *context, const char *exten, int priority);
/*! Synchronously or asynchronously make an outbound call and send it to a
particular extension */
int ast_pbx_outgoing_exten(const char *type, int format, void *data, int timeout, const char *context, const char *exten, int priority, int *reason, int sync, const char *cid_num, const char *cid_name, struct ast_variable *vars, const char *account, struct ast_channel **locked_channel);
/*! Synchronously or asynchronously make an outbound call and send it to a
particular application with given extension */
int ast_pbx_outgoing_app(const char *type, int format, void *data, int timeout, const char *app, const char *appdata, int *reason, int sync, const char *cid_num, const char *cid_name, struct ast_variable *vars, const char *account, struct ast_channel **locked_channel);
/*!
* \brief Evaluate a condition
*
* \retval 0 if the condition is NULL or of zero length
* \retval int If the string is an integer, the integer representation of
* the integer is returned
* \retval 1 Any other non-empty string
*/
int pbx_checkcondition(const char *condition);
/*! @name
* Functions for returning values from structures */
/*! @{ */
const char *ast_get_context_name(struct ast_context *con);
const char *ast_get_extension_name(struct ast_exten *exten);
struct ast_context *ast_get_extension_context(struct ast_exten *exten);
const char *ast_get_include_name(struct ast_include *include);
const char *ast_get_ignorepat_name(struct ast_ignorepat *ip);
const char *ast_get_switch_name(struct ast_sw *sw);
const char *ast_get_switch_data(struct ast_sw *sw);
/*! @} */
/*! @name Other Extension stuff */
/*! @{ */
int ast_get_extension_priority(struct ast_exten *exten);
int ast_get_extension_matchcid(struct ast_exten *e);
const char *ast_get_extension_cidmatch(struct ast_exten *e);
const char *ast_get_extension_app(struct ast_exten *e);
const char *ast_get_extension_label(struct ast_exten *e);
void *ast_get_extension_app_data(struct ast_exten *e);
/*! @} */
/*! @name Registrar info functions ... */
/*! @{ */
const char *ast_get_context_registrar(struct ast_context *c);
const char *ast_get_extension_registrar(struct ast_exten *e);
const char *ast_get_include_registrar(struct ast_include *i);
const char *ast_get_ignorepat_registrar(struct ast_ignorepat *ip);
const char *ast_get_switch_registrar(struct ast_sw *sw);
/*! @} */
/* Walking functions ... */
struct ast_context *ast_walk_contexts(struct ast_context *con);
struct ast_exten *ast_walk_context_extensions(struct ast_context *con,
struct ast_exten *priority);
struct ast_exten *ast_walk_extension_priorities(struct ast_exten *exten,
struct ast_exten *priority);
struct ast_include *ast_walk_context_includes(struct ast_context *con,
struct ast_include *inc);
struct ast_ignorepat *ast_walk_context_ignorepats(struct ast_context *con,
struct ast_ignorepat *ip);
struct ast_sw *ast_walk_context_switches(struct ast_context *con, struct ast_sw *sw);
int pbx_builtin_serialize_variables(struct ast_channel *chan, struct ast_str **buf);
const char *pbx_builtin_getvar_helper(struct ast_channel *chan, const char *name);
void pbx_builtin_pushvar_helper(struct ast_channel *chan, const char *name, const char *value);
void pbx_builtin_setvar_helper(struct ast_channel *chan, const char *name, const char *value);
void pbx_retrieve_variable(struct ast_channel *c, const char *var, char **ret, char *workspace, int workspacelen, struct varshead *headp);
void pbx_builtin_clear_globals(void);
int pbx_builtin_setvar(struct ast_channel *chan, void *data);
void pbx_substitute_variables_helper(struct ast_channel *c,const char *cp1,char *cp2,int count);
void pbx_substitute_variables_varshead(struct varshead *headp, const char *cp1, char *cp2, int count);
int ast_extension_patmatch(const char *pattern, const char *data);
/*! Set "autofallthrough" flag, if newval is <0, does not acutally set. If
set to 1, sets to auto fall through. If newval set to 0, sets to no auto
fall through (reads extension instead). Returns previous value. */
int pbx_set_autofallthrough(int newval);
int ast_goto_if_exists(struct ast_channel *chan, const char *context, const char *exten, int priority);
/* I can find neither parsable nor parseable at dictionary.com, but google gives me 169000 hits for parseable and only 49,800 for parsable */
int ast_parseable_goto(struct ast_channel *chan, const char *goto_string);
int ast_explicit_goto(struct ast_channel *chan, const char *context, const char *exten, int priority);
int ast_async_goto_if_exists(struct ast_channel *chan, const char *context, const char *exten, int priority);
struct ast_custom_function* ast_custom_function_find(const char *name);
/*!
* \brief Unregister a custom function
*/
int ast_custom_function_unregister(struct ast_custom_function *acf);
/*!
* \brief Reigster a custom function
*/
int ast_custom_function_register(struct ast_custom_function *acf);
/*!
* \brief Retrieve the number of active calls
*/
int ast_active_calls(void);
/*!
* \brief executes a read operation on a function
*
* \param chan Channel to execute on
* \param function Data containing the function call string (will be modified)
* \param workspace A pointer to safe memory to use for a return value
* \param len the number of bytes in workspace
*
* This application executes a function in read mode on a given channel.
*
* \return zero on success, non-zero on failure
*/
int ast_func_read(struct ast_channel *chan, const char *function, char *workspace, size_t len);
/*!
* \brief executes a write operation on a function
*
* \param chan Channel to execute on
* \param function Data containing the function call string (will be modified)
* \param value A value parameter to pass for writing
*
* This application executes a function in write mode on a given channel.
*
* \return zero on success, non-zero on failure
*/
int ast_func_write(struct ast_channel *chan, const char *function, const char *value);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
#endif /* _ASTERISK_PBX_H */