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/* [ICS VERSION STRING: unknown] */

#ifndef _IPROC_FS_H_

#define _IPROC_FS_H_

#include "iba/public/iproc_fs_osd.h"

#ifdef __cplusplus

extern "C" {

#endif

#define NULL_NODE   NULL

/* Below are descriptions of the functions which are provided by iproc_fs_osd.h

 * On some platforms these may be defines, on others they may be actual

 * functions.

 */

/**********************************************************

 *     IBA_PROC_READ_FUNC - "/proc node" read handler

 * 

 * A driver implements a function of this type to handle reads

 * from its registered "/proc node". It should fill in the

 * user data buffer with the data to be returned.

 * 

 * The 'off' argument indicates the byte position within

 * the buffer where the current segment begins. This will

 * always be zero on Darwin, since the entire user buffer

 * is read in a single pass.

 * 

 * The 'eof' argument points to an End Of File flag that the

 * driver should set to 1.

 * 

 * This function should return the number of bytes written into

 * the user data buffer, to be displayed as read data.

 * 

 * Equivalent to Linux read_func_t:

 * 

 * "The read function should write its information into the page.

 * For proper use, the function should start writing at an offset of off in

 * page and write at most count bytes, but because most read functions are

 * quite simple and only return a small amount of information, these two

 * parameters are usually ignored (it breaks pagers like more

 * and less, but cat still works).

 * If the off and count parameters are properly used, eof should be used to

 * signal that the end of the file has been reached by writing 1 to the memory

 * location eof points to.

 * 

 * The read_func function must return the number of bytes written into the page.

 * or a IBA_PROC_RET value to reflect an error code"

 * typedef IBA_PROC_RET (IBA_PROC_READ_FUNC) (

 *     char *buffer,           // User data buffer

 *     char **start,           // Not used

 *     IBA_PROC_OFFSET off,    // Byte offset into buffer

 *     int count,              // max bytes to write

 *     int *eof,               // Returned EOF flag

 *     void *priv              ///Kernel private data

 * );

 ***********************************************************/

/**********************************************************

 *     IBA_PROC_WRITE_FUNC - "/proc node" write handler

 * 

 * A driver implements a function of this type to handle

 * writes to its registered "/proc node". It should copy the

 * data in the user buffer for its own internal use.

 * 

 * Equivalent to Linux write_func_t:

 * 

 * "The write function should read count bytes at maximum from the buffer."

 * 

 * This function returns the number of bytes written

 * or a IBA_PROC_RET value to reflect an error code

 * typedef IBA_PROC_RET (IBA_PROC_WRITE_FUNC) (

 *     IBA_PROC_FILE * file,   // File pointer

 *     const char *buffer,     // User data buffer

 *     unsigned long count,    // Max bytes to read

 *     void *priv              // Kernel private data

 * );

 ***********************************************************/

/**********************************************************

 *     iba_proc_mkdir() - Create a "/proc directory node".

 * 

 * A driver calls this function to create a directory node

 * within the emulated "/proc file system" in IbAccess.  The

 * directory node will be created with the specified file name,

 * under the directory node specified by 'parent'.

 * A NULL value for 'parent' implies the root node ("/proc").

 * 

 * IbAccess returns an opaque handle to that node.

 * 

 * IBA_PROC_NODE *

 * iba_proc_mkdir(

 *     const char              *name,      // File name

 *     IBA_PROC_NODE           *parent     // Parent directory

 * );

 ***********************************************************/

/**********************************************************

 *     iba_create_proc_entry() - Create a "/proc file node".

 * 

 * A driver calls this function to create a file node

 * within the emulated "/proc file system" in IbAccess.  The

 * file node will be created with the specified file name,

 * under the directory node specified by 'parent'.

 * A NULL value for 'parent' implies the root node ("/proc").

 * 

 * IbAccess returns an opaque handle to that node, which can

 * be used later to remove it.

 * 

 * After the node has been created, IbAccess will accept

 * PROC_READ and PROC_WRITE User Client commands directed to

 * this node, calling the driver's registered read and write

 * handlers, respectively. If a NULL handler was registered,

 * then IbAccess will return an Access Error to the user

 * instead. The 'priv' argument is a driver private data

 * structure that IbAccess will associate with the node and

 * return to the driver when calling its read or write

 * handler.

 * 

 * IBA_PROC_NODE *

 * iba_create_proc_entry(

 *     const char              *name,      // File name

 *     IBA_PROC_MODE           mode,       // File mode (N/U on Darwin)

 *     IBA_PROC_NODE           *parent     // Parent directory

 * );

 ***********************************************************/

/**********************************************************

 *     iba_get_proc_*(), iba_set_proc_*()

 * 

 * These are accessor functions for the opaque IBA_PROC_NODE

 * structure.

 * 

 * void

 * iba_set_proc_read_func(

 *     IBA_PROC_NODE           *node,      // File proc node

 *     IBA_PROC_READ_FUNC      *rd_func    // Read handler function

 * );

 * 

 * void

 * iba_set_proc_write_func(

 *     IBA_PROC_NODE           *node,      // File proc node

 *     IBA_PROC_WRITE_FUNC     *wr_func    // Write handler function

 * );

 * 

 * // return >=0 for byte count on success, <0 is a PROC_IBA_RET_* value

 * static _inline IBA_PROC_RET

 * iba_proc_copy_user_data(

 * 	char				*dest,			// kernel destination buffer

 * 	const char*			userBuffer,		// user buffer from IBA_PROC_WRITE_FUNC

 * 	unsigned			bytes			// number of bytes to copy

 * );

 * 

 * void

 * iba_set_proc_data(

 *     IBA_PROC_NODE           *node,      // File proc node

 *     void                    *data       // Private data struct

 * );

 * 

 * void *

 * iba_get_proc_data(

 *     IBA_PROC_NODE           *node       // File proc node

 * );

 * 

 * const char *

 * iba_get_proc_name(

 *     IBA_PROC_NODE           *node       // File proc node

 * );

 ***********************************************************/

/**********************************************************

 *     iba_remove_proc_entry() - Remove a "/proc node".

 * 

 * A driver calls this function to remove a previously created

 * "/proc node", of either file or directory type, specified

 * by the node name and parent directory node.

 * A NULL value for 'parent' implies the root node ("/proc").

 * 

 * void

 * iba_remove_proc_entry(

 *     const char              *name,      // Node name

 *     IBA_PROC_NODE           *parent     // Parent directory

 * );

 ***********************************************************/

/* support function type for iba_proc_read_wrapper

 * called in a premptable context

 *

 * Inputs:

 *	data - context information

 * Outputs:

 *	total_size - returns size of proc text returned (not including any \0)

 * Returns:

 *   	a pointer to text array of data to output for /proc read

 *	can be NULL if unable to allocate or no data available

 *	if NULL is returned, *total_size should be unchanged or 0

 *	caller will MemoryDeallocate when done

 */

typedef char * (*IBA_PROC_FORMAT_FUNC)(void *data, int* total_size);

/* General purpose function to support proc file reads

 * for simple /proc files, this can be provided as the read_func

 *

 * config_data, config_alloc, total_size - static variables in proc function

 *		will be managed here to maintain context across multiple read calls to

 *		this file.

 * func - function to allocate space to text contents and format it

 * func_data - will be passed as argument to provide context of what to format

 * buf, start, offset, maxlen, eof - standard proc read arguments

 */

extern IBA_PROC_RET

iba_proc_read_wrapper(char **config_data, char **config_alloc, int *total_size,

		IBA_PROC_FORMAT_FUNC func, void* func_data,

 		char *buf, char **start, IBA_PROC_OFFSET offset, int maxlen,

		int *eof);

/* for simpler /proc interfaces, this provides a simplified

 * interface.  Caller need only supply a format function and an optional

 * clear function (to be called by write)

 * The function provides all the necessary initialization and handler functions

 * for the /proc interface itself

 */

/* function type for optional clear function, used on write to /proc file */

typedef void (*SIMPLE_PROC_CLEAR_FUNC)(void *context);

#define SIMPLE_PROC_NAME_LEN 80

typedef struct _SIMPLE_PROC {

	boolean			Initialized;

	void 			*Context;	/* callback's context */

	char 			Name[SIMPLE_PROC_NAME_LEN];/* relative file name */

	IBA_PROC_NODE 		*ProcDir;	/* parent directory */

	IBA_PROC_FORMAT_FUNC	FormatFunc;	/* callback function */

	SIMPLE_PROC_CLEAR_FUNC 	ClearFunc;	/* callback function */

	char 			*config_data;	/* for use in read */

	char 			*config_alloc;	/* for use in read */

	int 			total_size;	/* for use in read */

} SIMPLE_PROC;

extern void

SimpleProcInitState(SIMPLE_PROC *pProc);

/* create and initialize /proc file

 * Inputs:

 *	pProc - object to initialize

 *	Name - relative filename in ProcDir

 *	ProcDir - parent directory

 *	Context - context to pass to FormatFunc and ClearFunc

 *	FormatFunc - function to allocate and format /proc read data

 *	ClearFunc - function to clear data in response to /proc write

 * Outputs:

 *	None

 * Returns:

 *	true - initialized and callbacks will begin on user access to /proc

 *	false - unable to create

 *

 * must be called in a preemptable context

 */

extern boolean

SimpleProcInit(SIMPLE_PROC *pProc, const char* Name, IBA_PROC_NODE *ProcDir, 

		void *Context, IBA_PROC_FORMAT_FUNC FormatFunc,

		OPTIONAL SIMPLE_PROC_CLEAR_FUNC ClearFunc);

extern void

SimpleProcDestroy(SIMPLE_PROC *pProc);

#ifdef __cplusplus

}

#endif

#endif /* _IPROC_FS_H_ */