86 lines
2.3 KiB
C
Executable File
86 lines
2.3 KiB
C
Executable File
/*
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* Asterisk
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*
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* Mark Spencer <markster@marko.net>
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*
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* Copyright(C) Mark Spencer
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*
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* Distributed under the terms of the GNU General Public License (GPL) Version 2
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*
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* I/O Managment (derived from Cheops-NG)
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*
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*/
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#ifndef _IO_H
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#define _IO_H
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#include <sys/poll.h> /* For POLL* constants */
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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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#define AST_IO_IN POLLIN /* Input ready */
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#define AST_IO_OUT POLLOUT /* Output ready */
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#define AST_IO_PRI POLLPRI /* Priority input ready */
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/* Implicitly polled for */
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#define AST_IO_ERR POLLERR /* Error condition (errno or getsockopt) */
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#define AST_IO_HUP POLLHUP /* Hangup */
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#define AST_IO_NVAL POLLNVAL /* Invalid fd */
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/*
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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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/* Create a context for I/O operations */
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extern struct io_context *io_context_create(void);
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/* Destroy a context for I/O operations */
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extern 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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* Watch for any of revents activites on fd, calling callback with data as
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* callback data. Returns a pointer to ID of the IO event, or NULL on failure.
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*/
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extern 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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* Change an i/o handler, updating fd if > -1, callback if non-null, and revents
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* if >-1, and data if non-null. Returns a pointero to the ID of the IO event,
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* or NULL on failure.
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*/
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extern 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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* Remove an I/O id from consideration Returns 0 on success or -1 on failure.
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*/
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extern int ast_io_remove(struct io_context *ioc, int *id);
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/*
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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. Returns the number of
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* I/O events which took place.
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*/
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extern int ast_io_wait(struct io_context *ioc, int howlong);
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/*
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* Debugging: Dump everything in the I/O array
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*/
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extern void ast_io_dump(struct io_context *ioc);
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif
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