Asterisk/include/asterisk.h

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * General Definitions for Asterisk top level program
 *
 * Copyright (C) 1999-2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

/*! \file
 * \brief Asterisk main include file. File version handling, generic pbx functions.
 */

#ifndef _ASTERISK_H
#define _ASTERISK_H

#include "asterisk/autoconfig.h"

#if !defined(NO_MALLOC_DEBUG) && !defined(STANDALONE) && !defined(STANDALONE2) && defined(MALLOC_DEBUG)
#include "asterisk/astmm.h"
#endif

#include "asterisk/compat.h"

/* Default to allowing the umask or filesystem ACLs to determine actual file
 * creation permissions
 */
#ifndef AST_DIR_MODE
#define AST_DIR_MODE 0777
#endif
#ifndef AST_FILE_MODE
#define AST_FILE_MODE 0666
#endif

/* Make sure PATH_MAX is defined on platforms (HURD) that don't define it.
 * Also be sure to handle the case of a path larger than PATH_MAX
 * (err safely) in the code.
 */
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif


#define DEFAULT_LANGUAGE "en"

#define DEFAULT_SAMPLE_RATE 8000
#define DEFAULT_SAMPLES_PER_MS  ((DEFAULT_SAMPLE_RATE)/1000)
#define	setpriority	__PLEASE_USE_ast_set_priority_INSTEAD_OF_setpriority__
#define	sched_setscheduler	__PLEASE_USE_ast_set_priority_INSTEAD_OF_sched_setscheduler__

#if defined(DEBUG_FD_LEAKS) && !defined(STANDALONE) && !defined(STANDALONE2) && !defined(STANDALONE_AEL)
/* These includes are all about ordering */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <fcntl.h>

#define	open(a,...)	__ast_fdleak_open(__FILE__,__LINE__,__PRETTY_FUNCTION__, a, __VA_ARGS__)
#define pipe(a)		__ast_fdleak_pipe(a, __FILE__,__LINE__,__PRETTY_FUNCTION__)
#define socket(a,b,c)	__ast_fdleak_socket(a, b, c, __FILE__,__LINE__,__PRETTY_FUNCTION__)
#define close(a)	__ast_fdleak_close(a)
#define	fopen(a,b)	__ast_fdleak_fopen(a, b, __FILE__,__LINE__,__PRETTY_FUNCTION__)
#define	fclose(a)	__ast_fdleak_fclose(a)
#define	dup2(a,b)	__ast_fdleak_dup2(a, b, __FILE__,__LINE__,__PRETTY_FUNCTION__)
#define dup(a)		__ast_fdleak_dup(a, __FILE__,__LINE__,__PRETTY_FUNCTION__)

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
int __ast_fdleak_open(const char *file, int line, const char *func, const char *path, int flags, ...);
int __ast_fdleak_pipe(int *fds, const char *file, int line, const char *func);
int __ast_fdleak_socket(int domain, int type, int protocol, const char *file, int line, const char *func);
int __ast_fdleak_close(int fd);
FILE *__ast_fdleak_fopen(const char *path, const char *mode, const char *file, int line, const char *func);
int __ast_fdleak_fclose(FILE *ptr);
int __ast_fdleak_dup2(int oldfd, int newfd, const char *file, int line, const char *func);
int __ast_fdleak_dup(int oldfd, const char *file, int line, const char *func);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
#endif

int ast_set_priority(int);			/*!< Provided by asterisk.c */
int ast_fd_init(void);				/*!< Provided by astfd.c */
int ast_pbx_init(void);				/*!< Provided by pbx.c */

/*!
 * \brief Register a function to be executed before Asterisk exits.
 * \param func The callback function to use.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 *
 * \note This function should be rarely used in situations where
 * something must be shutdown to avoid corruption, excessive data
 * loss, or when external programs must be stopped.  All other
 * cleanup in the core should use ast_register_cleanup.
 */
int ast_register_atexit(void (*func)(void));

/*!
 * \since 11.9
 * \brief Register a function to be executed before Asterisk gracefully exits.
 *
 * If Asterisk is immediately shutdown (core stop now, or sending the TERM
 * signal), the callback is not run. When the callbacks are run, they are run in
 * sequence with ast_register_atexit() callbacks, in the reverse order of
 * registration.
 *
 * \param func The callback function to use.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
int ast_register_cleanup(void (*func)(void));

/*!
 * \brief Unregister a function registered with ast_register_atexit().
 * \param func The callback function to unregister.
 */
void ast_unregister_atexit(void (*func)(void));

/*!
 * \brief Cancel an existing shutdown and return to normal operation.
 *
 * \note Shutdown can be cancelled while the server is waiting for
 * any existing channels to be destroyed before shutdown becomes
 * irreversible.
 *
 * \return non-zero if shutdown cancelled.
 */
int ast_cancel_shutdown(void);

/*!
 * \details
 * The server is preventing new channel creation in preparation for
 * shutdown and may actively be releasing resources.  The shutdown
 * process may be canceled by ast_cancel_shutdown() if it is not too
 * late.
 *
 * \note The preparation to shutdown phase can be quite lengthy
 * if we are gracefully shutting down.  How long existing calls will
 * last is not up to us.
 *
 * \return non-zero if the server is preparing to or actively shutting down.
 */
int ast_shutting_down(void);

/*!
 * \return non-zero if the server is actively shutting down.
 * \since 13.3.0
 *
 * \details
 * The server is releasing resources and unloading modules.
 * It won't be long now.
 */
int ast_shutdown_final(void);

#if !defined(LOW_MEMORY)
/*!
 * \brief Register the version of a source code file with the core.
 * \param file the source file name
 * \param version the version string (typically a SVN revision keyword string)
 * \return nothing
 *
 * \note As of 13.4.0, the \c version parameter is ignored.
 *
 * This function should not be called directly, but instead the
 * ASTERISK_FILE_VERSION macro should be used to register a file with the core.
 */
void ast_register_file_version(const char *file, const char *version);

/*!
 * \brief Unregister a source code file from the core.
 * \param file the source file name
 * \return nothing
 *
 * This function should not be called directly, but instead the
 * ASTERISK_FILE_VERSION macro should be used to automatically unregister
 * the file when the module is unloaded.
 */
void ast_unregister_file_version(const char *file);

/*!
 * \brief Find version for given module name
 * \param file Module name (i.e. chan_sip.so)
 *
* \note As of 13.4.0, the file version is no longer tracked. As such,
 * if the file exists, the Asterisk version will be returned.
 *
 * \retval NULL if the file doesn't exist.
 * \retval The Asterisk version if the file does exist.
 */
const char *ast_file_version_find(const char *file);

/*!
 * \brief Complete a source file name
 * \param partial The partial name of the file to look up.
 * \param n The n-th match to return.
 *
 * \retval NULL if there is no match for partial at the n-th position
 * \retval Matching source file name
 *
 * \note A matching source file is allocataed on the heap, and must be
 * free'd by the caller.
 */
char *ast_complete_source_filename(const char *partial, int n);

/*!
 * \brief Register/unregister a source code file with the core.
 * \param file the source file name
 * \param version the version string (typically a SVN revision keyword string)
 *
 * This macro will place a file-scope constructor and destructor into the
 * source of the module using it; this will cause the version of this file
 * to registered with the Asterisk core (and unregistered) at the appropriate
 * times.
 *
 * Example:
 *
 * \code
 * ASTERISK_FILE_VERSION(__FILE__, "\$Revision\$")
 * \endcode
 *
 * \note The dollar signs above have been protected with backslashes to keep
 * SVN from modifying them in this file; under normal circumstances they would
 * not be present and SVN would expand the Revision keyword into the file's
 * revision number.
 *
 * \deprecated All new files should use ASTERISK_REGISTER_FILE instead.
 * \version 11.22.0 deprecated
 */
#ifdef MTX_PROFILE
#define	HAVE_MTX_PROFILE	/* used in lock.h */
#define ASTERISK_FILE_VERSION(file, version) \
	static int mtx_prof = -1;       /* profile mutex */	\
	static void __attribute__((constructor)) __register_file_version(void) \
	{ \
		mtx_prof = ast_add_profile("mtx_lock_" file, 0);	\
		ast_register_file_version(file, version); \
	} \
	static void __attribute__((destructor)) __unregister_file_version(void) \
	{ \
		ast_unregister_file_version(file); \
	}
#else /* !MTX_PROFILE */
#define ASTERISK_FILE_VERSION(file, version) \
	static void __attribute__((constructor)) __register_file_version(void) \
	{ \
		ast_register_file_version(file, version); \
	} \
	static void __attribute__((destructor)) __unregister_file_version(void) \
	{ \
		ast_unregister_file_version(file); \
	}
#endif /* !MTX_PROFILE */
#else /* LOW_MEMORY */
#define ASTERISK_FILE_VERSION(file, x)
#endif /* LOW_MEMORY */

/*!
 * \since 11.22.0
 * \brief Register/unregister a source code file with the core.
 *
 * This macro will place a file-scope constructor and destructor into the
 * source of the module using it; this will cause the file to be
 * registered with the Asterisk core (and unregistered) at the appropriate
 * times.
 *
 * Example:
 *
 * \code
 * ASTERISK_REGISTER_FILE()
 * \endcode
 */
#define ASTERISK_REGISTER_FILE() ASTERISK_FILE_VERSION(__FILE__, NULL)

#if !defined(LOW_MEMORY)
/*!
 * \brief support for event profiling
 *
 * (note, this must be documented a lot more)
 * ast_add_profile allocates a generic 'counter' with a given name,
 * which can be shown with the command 'core show profile &lt;name&gt;'
 *
 * The counter accumulates positive or negative values supplied by
 * \see ast_add_profile(), dividing them by the 'scale' value passed in the
 * create call, and also counts the number of 'events'.
 * Values can also be taked by the TSC counter on ia32 architectures,
 * in which case you can mark the start of an event calling ast_mark(id, 1)
 * and then the end of the event with ast_mark(id, 0).
 * For non-i386 architectures, these two calls return 0.
 */
int ast_add_profile(const char *, uint64_t scale);
int64_t ast_profile(int, int64_t);
int64_t ast_mark(int, int start1_stop0);
#else /* LOW_MEMORY */
#define ast_add_profile(a, b) 0
#define ast_profile(a, b) do { } while (0)
#define ast_mark(a, b) do { } while (0)
#endif /* LOW_MEMORY */

/*! \brief
 * Definition of various structures that many asterisk files need,
 * but only because they need to know that the type exists.
 *
 */

struct ast_channel;
struct ast_frame;
struct ast_module;
struct ast_variable;
struct ast_str;
struct ast_sched_context;
struct ast_json;

/* Some handy macros for turning a preprocessor token into (effectively) a quoted string */
#define __stringify_1(x)	#x
#define __stringify(x)		__stringify_1(x)

/*!
 * \brief Retrieve the PBX UUID
 * \param pbx_uuid A buffer of at least AST_UUID_STR_LEN (36 + 1) size to receive the UUID
 * \param length The buffer length
 */
int ast_pbx_uuid_get(char *pbx_uuid, int length);

#endif /* _ASTERISK_H */