app.h

asterisk 是一个很有知名度开源软件

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <[e-mail]>
 * 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 Application convenience functions, designed to give consistent
 *        look and feel to Asterisk apps.
 */

#ifndef _ASTERISK_APP_H
#define _ASTERISK_APP_H

struct ast_flags64;

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

/* IVR stuff */

/*! \brief Callback function for IVR
    \return returns 0 on completion, -1 on hangup or digit if interrupted 
  */
typedef int (*ast_ivr_callback)(struct ast_channel *chan, char *option, void *cbdata);

typedef enum {
	AST_ACTION_UPONE,	/*!< adata is unused */
	AST_ACTION_EXIT,	/*!< adata is the return value for ast_ivr_menu_run if channel was not hungup */
	AST_ACTION_CALLBACK,	/*!< adata is an ast_ivr_callback */
	AST_ACTION_PLAYBACK,	/*!< adata is file to play */
	AST_ACTION_BACKGROUND,	/*!< adata is file to play */
	AST_ACTION_PLAYLIST,	/*!< adata is list of files, separated by ; to play */
	AST_ACTION_MENU,	/*!< adata is a pointer to an ast_ivr_menu */
	AST_ACTION_REPEAT,	/*!< adata is max # of repeats, cast to a pointer */
	AST_ACTION_RESTART,	/*!< adata is like repeat, but resets repeats to 0 */
	AST_ACTION_TRANSFER,	/*!< adata is a string with exten\verbatim[@context]\endverbatim */
	AST_ACTION_WAITOPTION,	/*!< adata is a timeout, or 0 for defaults */
	AST_ACTION_NOOP,	/*!< adata is unused */
	AST_ACTION_BACKLIST,	/*!< adata is list of files separated by ; allows interruption */
} ast_ivr_action;

/*! 
    Special "options" are: 
   \arg "s" - "start here (one time greeting)"
   \arg "g" - "greeting/instructions"
   \arg "t" - "timeout"
   \arg "h" - "hangup"
   \arg "i" - "invalid selection"

*/
struct ast_ivr_option {
	char *option;
	ast_ivr_action action;
	void *adata;	
};

struct ast_ivr_menu {
	char *title;		/*!< Title of menu */
	unsigned int flags;	/*!< Flags */
	struct ast_ivr_option *options;	/*!< All options */
};

#define AST_IVR_FLAG_AUTORESTART (1 << 0)

#define AST_IVR_DECLARE_MENU(holder, title, flags, foo...) \
	static struct ast_ivr_option __options_##holder[] = foo;\
	static struct ast_ivr_menu holder = { title, flags, __options_##holder }
	

/*!	\brief Runs an IVR menu 
	\return returns 0 on successful completion, -1 on hangup, or -2 on user error in menu */
int ast_ivr_menu_run(struct ast_channel *c, struct ast_ivr_menu *menu, void *cbdata);

/*! \brief Plays a stream and gets DTMF data from a channel 
 * \param c Which channel one is interacting with
 * \param prompt File to pass to ast_streamfile (the one that you wish to play).
 *        It is also valid for this to be multiple files concatenated by "&".
 *        For example, "file1&file2&file3".
 * \param s The location where the DTMF data will be stored
 * \param maxlen Max Length of the data
 * \param timeout Timeout length waiting for data(in milliseconds).  Set to 0 for standard timeout(six seconds), or -1 for no time out.
 *
 *  This function was designed for application programmers for situations where they need 
 *  to play a message and then get some DTMF data in response to the message.  If a digit 
 *  is pressed during playback, it will immediately break out of the message and continue
 *  execution of your code.
 */
int ast_app_getdata(struct ast_channel *c, const char *prompt, char *s, int maxlen, int timeout);

/*! \brief Full version with audiofd and controlfd.  NOTE: returns '2' on ctrlfd available, not '1' like other full functions */
int ast_app_getdata_full(struct ast_channel *c, char *prompt, char *s, int maxlen, int timeout, int audiofd, int ctrlfd);

void ast_install_vm_functions(int (*has_voicemail_func)(const char *mailbox, const char *folder),
			      int (*inboxcount_func)(const char *mailbox, int *newmsgs, int *oldmsgs),
			      int (*messagecount_func)(const char *context, const char *mailbox, const char *folder));
  
void ast_uninstall_vm_functions(void);

/*! \brief Determine if a given mailbox has any voicemail */
int ast_app_has_voicemail(const char *mailbox, const char *folder);

/*! \brief Determine number of new/old messages in a mailbox */
int ast_app_inboxcount(const char *mailbox, int *newmsgs, int *oldmsgs);

/*! \brief Determine number of messages in a given mailbox and folder */
int ast_app_messagecount(const char *context, const char *mailbox, const char *folder);

/*! \brief Safely spawn an external program while closing file descriptors 
	\note This replaces the \b system call in all Asterisk modules
*/
int ast_safe_system(const char *s);

/*!
 * \brief Replace the SIGCHLD handler
 *
 * Normally, Asterisk has a SIGCHLD handler that is cleaning up all zombie
 * processes from forking elsewhere in Asterisk.  However, if you want to
 * wait*() on the process to retrieve information about it's exit status,
 * then this signal handler needs to be temporarily replaced.
 *
 * Code that executes this function *must* call ast_unreplace_sigchld()
 * after it is finished doing the wait*().
 */
void ast_replace_sigchld(void);

/*!
 * \brief Restore the SIGCHLD handler
 *
 * This function is called after a call to ast_replace_sigchld.  It restores
 * the SIGCHLD handler that cleans up any zombie processes.
 */
void ast_unreplace_sigchld(void);

/*!
  \brief Send DTMF to a channel

  \param chan    The channel that will receive the DTMF frames
  \param peer    (optional) Peer channel that will be autoserviced while the
                 primary channel is receiving DTMF
  \param digits  This is a string of characters representing the DTMF digits
                 to be sent to the channel.  Valid characters are
                 "0123456789*#abcdABCD".  Note: You can pass arguments 'f' or
                 'F', if you want to Flash the channel (if supported by the
                 channel), or 'w' to add a 500 millisecond pause to the DTMF
                 sequence.
  \param between This is the number of milliseconds to wait in between each
                 DTMF digit.  If zero milliseconds is specified, then the
                 default value of 100 will be used.
  \param duration This is the duration that each DTMF digit should have.
*/
int ast_dtmf_stream(struct ast_channel *chan, struct ast_channel *peer, const char *digits, int between, unsigned int duration);

/*! \brief Stream a filename (or file descriptor) as a generator. */
int ast_linear_stream(struct ast_channel *chan, const char *filename, int fd, int allowoverride);

/*! 
 * \brief Stream a file with fast forward, pause, reverse, restart. 
 * \param chan 
 * \param file filename
 * \param fwd, rev, stop, pause, restart, skipms, offsetms 
 *
 * Before calling this function, set this to be the number 
 * of ms to start from the beginning of the file.  When the function
 * returns, it will be the number of ms from the beginning where the
 * playback stopped.  Pass NULL if you don't care.
 */
int ast_control_streamfile(struct ast_channel *chan, const char *file, const char *fwd, const char *rev, const char *stop, const char *pause, const char *restart, int skipms, long *offsetms);

/*! \brief Play a stream and wait for a digit, returning the digit that was pressed */
int ast_play_and_wait(struct ast_channel *chan, const char *fn);

int ast_play_and_record_full(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime_sec, const char *fmt, int *duration, int silencethreshold, int maxsilence_ms, const char *path, const char *acceptdtmf, const char *canceldtmf);

/*! \brief Record a file for a max amount of time (in seconds), in a given list of formats separated by '|', outputting the duration of the recording, and with a maximum 
 \n
 permitted silence time in milliseconds of 'maxsilence' under 'silencethreshold' or use '-1' for either or both parameters for defaults. 
     calls ast_unlock_path() on 'path' if passed */
int ast_play_and_record(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime_sec, const char *fmt, int *duration, int silencethreshold, int maxsilence_ms, const char *path);

/*! \brief Record a message and prepend the message to the given record file after 
    playing the optional playfile (or a beep), storing the duration in 
    'duration' and with a maximum permitted silence time in milliseconds of 'maxsilence' under 
    'silencethreshold' or use '-1' for either or both parameters for defaults. */
int ast_play_and_prepend(struct ast_channel *chan, char *playfile, char *recordfile, int maxtime_sec, char *fmt, int *duration, int beep, int silencethreshold, int maxsilence_ms);

enum AST_LOCK_RESULT {
	AST_LOCK_SUCCESS = 0,
	AST_LOCK_TIMEOUT = -1,
	AST_LOCK_PATH_NOT_FOUND = -2,
	AST_LOCK_FAILURE = -3,
};

/*! \brief Type of locking to use in ast_lock_path / ast_unlock_path */
enum AST_LOCK_TYPE {
	AST_LOCK_TYPE_LOCKFILE = 0,
	AST_LOCK_TYPE_FLOCK = 1,
};

/*!
 * \brief Set the type of locks used by ast_lock_path()
 * \param type the locking type to use
 */
void ast_set_lock_type(enum AST_LOCK_TYPE type);

/*!
 * \brief Lock a filesystem path.
 * \param path the path to be locked
 * \return one of \ref AST_LOCK_RESULT values
 */
enum AST_LOCK_RESULT ast_lock_path(const char *path);

/*! \brief Unlock a path */
int ast_unlock_path(const char *path);

/*! \brief Read a file into asterisk*/
char *ast_read_textfile(const char *file);

struct ast_group_info;

/*! \brief Split a group string into group and category, returning a default category if none is provided. */
int ast_app_group_split_group(const char *data, char *group, int group_max, char *category, int category_max);

/*! \brief Set the group for a channel, splitting the provided data into group and category, if specified. */
int ast_app_group_set_channel(struct ast_channel *chan, const char *data);

/*! \brief Get the current channel count of the specified group and category. */
int ast_app_group_get_count(const char *group, const char *category);

/*! \brief Get the current channel count of all groups that match the specified pattern and category. */
int ast_app_group_match_get_count(const char *groupmatch, const char *category);

/*! \brief Discard all group counting for a channel */
int ast_app_group_discard(struct ast_channel *chan);