147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief I/O Management (derived from Cheops-NG)
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*/
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#ifndef _ASTERISK_IO_H
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#define _ASTERISK_IO_H
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#include "asterisk/poll-compat.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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/*! Input ready */
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#define AST_IO_IN POLLIN
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/*! Output ready */
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#define AST_IO_OUT POLLOUT
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/*! Priority input ready */
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#define AST_IO_PRI POLLPRI
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/* Implicitly polled for */
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/*! Error condition (errno or getsockopt) */
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#define AST_IO_ERR POLLERR
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/*! Hangup */
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#define AST_IO_HUP POLLHUP
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/*! Invalid fd */
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#define AST_IO_NVAL POLLNVAL
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/*! \brief
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* An Asterisk IO callback takes its id, a file descriptor, list of events, and
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* callback data as arguments and returns 0 if it should not be
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* run again, or non-zero if it should be run again.
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*/
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struct io_context;
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/*!
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* \brief Creates a context
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* Create a context for I/O operations
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* Basically mallocs an IO structure and sets up some default values.
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* \return an allocated io_context structure
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*/
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struct io_context *io_context_create(void);
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/*!
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* \brief Destroys a context
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* \param ioc structure to destroy
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* Destroy a context for I/O operations
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* Frees all memory associated with the given io_context structure along with the structure itself
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*/
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void io_context_destroy(struct io_context *ioc);
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typedef int (*ast_io_cb)(int *id, int fd, short events, void *cbdata);
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#define AST_IO_CB(a) ((ast_io_cb)(a))
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/*!
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* \brief Adds an IO context
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* \param ioc which context to use
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* \param fd which fd to monitor
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* \param callback callback function to run
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* \param events event mask of events to wait for
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* \param data data to pass to the callback
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* Watch for any of revents activites on fd, calling callback with data as
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* callback data.
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* \retval a pointer to ID of the IO event
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* \retval NULL on failure
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*/
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int *ast_io_add(struct io_context *ioc, int fd, ast_io_cb callback, short events, void *data);
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/*!
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* \brief Changes an IO handler
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* \param ioc which context to use
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* \param id
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* \param fd the fd you wish it to contain now
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* \param callback new callback function
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* \param events event mask to wait for
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* \param data data to pass to the callback function
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* Change an I/O handler, updating fd if > -1, callback if non-null,
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* and revents if >-1, and data if non-null.
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* \retval a pointer to the ID of the IO event
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* \retval NULL on failure
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*/
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int *ast_io_change(struct io_context *ioc, int *id, int fd, ast_io_cb callback, short events, void *data);
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/*!
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* \brief Removes an IO context
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* \param ioc which io_context to remove it from
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* \param id which ID to remove
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* Remove an I/O id from consideration
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* \retval 0 on success
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* \retval -1 on failure
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*/
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int ast_io_remove(struct io_context *ioc, int *id);
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/*!
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* \brief Waits for IO
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* \param ioc which context to act upon
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* \param howlong how many milliseconds to wait
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* Wait for I/O to happen, returning after
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* howlong milliseconds, and after processing
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* any necessary I/O.
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* \return he number of I/O events which took place.
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*/
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int ast_io_wait(struct io_context *ioc, int howlong);
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/*!
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* \brief Dumps the IO array.
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* Debugging: Dump everything in the I/O array
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*/
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void ast_io_dump(struct io_context *ioc);
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/*! Set fd into non-echoing mode (if fd is a tty) */
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int ast_hide_password(int fd);
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/*!
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* \brief Restores TTY mode.
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* Call with result from previous ast_hide_password
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*/
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int ast_restore_tty(int fd, int oldstatus);
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int ast_get_termcols(int fd);
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif /* _ASTERISK_IO_H */
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