io.c File Reference

Implementation of I/O functions as defined in kdbio.h. More...

#include <kdbhelper.h>
#include <kdbinvoke.h>
#include <kdbio.h>
#include <kdbioplugin.h>
#include <kdbioprivate.h>
#include <kdblogger.h>
#include <kdbprivate.h>
#include <fcntl.h>
#include <stdio.h>

Include dependency graph for io.c:

Functions
int	elektraIoContract (KeySet *contract, ElektraIoInterface *ioBinding)
	Creates a contract for use with kdbOpen() that sets up an I/O binding. More...
ElektraIoInterface *	elektraIoGetBinding (KDB *kdb)
	Get I/O binding for asynchronous I/O operations for KDB instance. More...
ElektraIoInterface *	elektraIoNewBinding (ElektraIoBindingAddFd *addFd, ElektraIoBindingUpdateFd *updateFd, ElektraIoBindingRemoveFd *removeFd, ElektraIoBindingAddTimer *addTimer, ElektraIoBindingUpdateTimer *updateTimer, ElektraIoBindingRemoveTimer *removeTimer, ElektraIoBindingAddIdle *addIdle, ElektraIoBindingUpdateIdle *updateIdle, ElektraIoBindingRemoveIdle *removeIdle, ElektraIoBindingCleanup *cleanup)
	Create a new I/O binding. More...
int	elektraIoBindingAddFd (ElektraIoInterface *binding, ElektraIoFdOperation *fdOp)
	Add file descriptor to be watched by I/O binding. More...
int	elektraIoBindingUpdateFd (ElektraIoFdOperation *fdOp)
	Notify I/O binding about changes to file descriptor watch operation. More...
int	elektraIoBindingRemoveFd (ElektraIoFdOperation *fdOp)
	Remove file descriptor from I/O binding. More...
int	elektraIoBindingAddTimer (ElektraIoInterface *binding, ElektraIoTimerOperation *timerOp)
	Add timer to I/O binding. More...
int	elektraIoBindingUpdateTimer (ElektraIoTimerOperation *timerOp)
	Notifiy I/O binding about changes to timer structure. More...
int	elektraIoBindingRemoveTimer (ElektraIoTimerOperation *timerOp)
	Remove timer from I/O binding. More...
int	elektraIoBindingAddIdle (ElektraIoInterface *binding, ElektraIoIdleOperation *idleOp)
	Add idle to I/O binding. More...
int	elektraIoBindingUpdateIdle (ElektraIoIdleOperation *idleOp)
	Notifiy I/O binding about changes to idle structure. More...
int	elektraIoBindingRemoveIdle (ElektraIoIdleOperation *idleOp)
	Remove idle from I/O binding. More...
int	elektraIoBindingCleanup (ElektraIoInterface *binding)
	Free memory used by I/O binding. More...
void *	elektraIoBindingGetData (ElektraIoInterface *binding)
	Get private data from I/O Binding. More...
int	elektraIoBindingSetData (ElektraIoInterface *binding, void *data)
	Set private data from I/O Binding. More...
ElektraIoFdOperation *	elektraIoNewFdOperation (int fd, int flags, int enabled, ElektraIoFdCallback callback, void *privateData)
	Create a new file descriptor watch operation. More...
ElektraIoTimerOperation *	elektraIoNewTimerOperation (unsigned int interval, int enabled, ElektraIoTimerCallback callback, void *privateData)
	Create a new timer operation. More...
ElektraIoIdleOperation *	elektraIoNewIdleOperation (int enabled, ElektraIoIdleCallback callback, void *privateData)
	Create a new idle operation. More...
int	elektraIoFdSetEnabled (ElektraIoFdOperation *fdOp, int enabled)
	Enable or disable file descriptor watch operation. More...
int	elektraIoFdSetFlags (ElektraIoFdOperation *fdOp, int flags)
	Update flag bitmask of file descriptor watch operation. More...
int	elektraIoTimerSetEnabled (ElektraIoTimerOperation *timerOp, int enabled)
	Enable or disable timer operation. More...
int	elektraIoTimerSetInterval (ElektraIoTimerOperation *timerOp, unsigned int interval)
	Update interval of timer operation. More...
int	elektraIoIdleSetEnabled (ElektraIoIdleOperation *idleOp, int enabled)
	Enable or disable idle operation. More...
int	elektraIoFdGetFd (ElektraIoFdOperation *fdOp)
	Get file descriptor number from operation. More...
void *	elektraIoFdGetData (ElektraIoFdOperation *fdOp)
	Get private data from operation. More...
int	elektraIoFdSetBindingData (ElektraIoFdOperation *fdOp, void *data)
	Set private binding data for operation. More...
void *	elektraIoFdGetBindingData (ElektraIoFdOperation *fdOp)
	Get private binding data from operation. More...
ElektraIoInterface *	elektraIoFdGetBinding (ElektraIoFdOperation *fdOp)
	Get binding from operation. More...
int	elektraIoFdIsEnabled (ElektraIoFdOperation *fdOp)
	Check if file descriptor watch operation is enabled or disabled. More...
int	elektraIoFdGetFlags (ElektraIoFdOperation *fdOp)
	Get flag bitmask of file descriptor watch operation. More...
ElektraIoFdCallback	elektraIoFdGetCallback (ElektraIoFdOperation *fdOp)
	Get callback of file descriptor watch operation. More...
int	elektraIoTimerSetBindingData (ElektraIoTimerOperation *timerOp, void *data)
	Set private binding data for operation. More...
void *	elektraIoTimerGetBindingData (ElektraIoTimerOperation *timerOp)
	Get private binding data from operation. More...
ElektraIoInterface *	elektraIoTimerGetBinding (ElektraIoTimerOperation *timerOp)
	Get binding from operation. More...
void *	elektraIoTimerGetData (ElektraIoTimerOperation *timerOp)
	Get private data from operation. More...
int	elektraIoTimerIsEnabled (ElektraIoTimerOperation *timerOp)
	Check if timer operation is enabled or disabled. More...
unsigned int	elektraIoTimerGetInterval (ElektraIoTimerOperation *timerOp)
	Get interval of timer operation. More...
ElektraIoTimerCallback	elektraIoTimerGetCallback (ElektraIoTimerOperation *timerOp)
	Get callback of timer operation. More...
int	elektraIoIdleSetBindingData (ElektraIoIdleOperation *idleOp, void *data)
	Set private binding data for operation. More...
void *	elektraIoIdleGetBindingData (ElektraIoIdleOperation *idleOp)
	Get private binding data from operation. More...
ElektraIoInterface *	elektraIoIdleGetBinding (ElektraIoIdleOperation *idleOp)
	Get binding from operation. More...
void *	elektraIoIdleGetData (ElektraIoIdleOperation *idleOp)
	Get private data from operation. More...
int	elektraIoIdleIsEnabled (ElektraIoIdleOperation *idleOp)
	Check if idle operation is enabled or disabled. More...
ElektraIoIdleCallback	elektraIoIdleGetCallback (ElektraIoIdleOperation *idleOp)
	Get callback of idle operation. More...

Detailed Description

Implementation of I/O functions as defined in kdbio.h.

Copyright

BSD License (see LICENSE.md or https://www.libelektra.org)

Function Documentation

elektraIoBindingAddFd()

int elektraIoBindingAddFd	(	ElektraIoInterface *	binding,
		ElektraIoFdOperation *	fdOp
	)

Add file descriptor to be watched by I/O binding.

An operation may only be added to one binding.

Parameters

binding	I/O binding handle
fdOp	file descriptor operation handle

Return values

1	on success
0	on error

elektraIoBindingAddIdle()

int elektraIoBindingAddIdle	(	ElektraIoInterface *	binding,
		ElektraIoIdleOperation *	idleOp
	)

Add idle to I/O binding.

Idle callbacks are executed without negative effects on other IO sources or the application (e.g. next event loop iteration) An operation may only be added to one binding.

Parameters

binding	I/O binding handle
idleOp	idle operation handle

Return values

1	on success
0	on error

elektraIoBindingAddTimer()

int elektraIoBindingAddTimer	(	ElektraIoInterface *	binding,
		ElektraIoTimerOperation *	timerOp
	)

Add timer to I/O binding.

Timeouts callbacks are executed after the initial interval has elapsed and then repeatedly after the interval has elapsed. An operation may only be added to one binding.

Parameters

binding	I/O binding handle
timerOp	timer operation handle

Return values

1	on success
0	on error

elektraIoBindingCleanup()

int elektraIoBindingCleanup

(

ElektraIoInterface *

binding

)

Free memory used by I/O binding.

All added operations have to be removed before calling this function.

Parameters

binding

I/O binding handle

Return values

1	on success
0	on error

elektraIoBindingGetData()

void* elektraIoBindingGetData

(

ElektraIoInterface *

binding

)

Get private data from I/O Binding.

To be used by I/O binding implementations only.

Parameters

binding

I/O-Binding handle

Returns

pointer to data or NULL on error

elektraIoBindingRemoveFd()

int elektraIoBindingRemoveFd

(

ElektraIoFdOperation *

fdOp

)

Remove file descriptor from I/O binding.

Parameters

fdOp	file descriptor operation handle

Return values

1	on success
0	on error

elektraIoBindingRemoveIdle()

int elektraIoBindingRemoveIdle

(

ElektraIoIdleOperation *

idleOp

)

Remove idle from I/O binding.

Parameters

idleOp

idle operation handle

Return values

1	on success
0	on error

elektraIoBindingRemoveTimer()

int elektraIoBindingRemoveTimer

(

ElektraIoTimerOperation *

timerOp

)

Remove timer from I/O binding.

Parameters

timerOp

timer operation handle

Return values

1	on success
0	on error

elektraIoBindingSetData()

int elektraIoBindingSetData	(	ElektraIoInterface *	binding,
		void *	data
	)

Set private data from I/O Binding.

To be used by I/O binding implementations only.

Parameters

binding	I/O binding handle
data	private data

Return values

1	on success
0	on error

elektraIoBindingUpdateFd()

int elektraIoBindingUpdateFd

(

ElektraIoFdOperation *

fdOp

)

Notify I/O binding about changes to file descriptor watch operation.

Parameters

fdOp	file descriptor operation handle

Return values

1	on success
0	on error

elektraIoBindingUpdateIdle()

int elektraIoBindingUpdateIdle

(

ElektraIoIdleOperation *

idleOp

)

Notifiy I/O binding about changes to idle structure.

Parameters

idleOp

idle operation handle

Return values

1	on success
0	on error

elektraIoBindingUpdateTimer()

int elektraIoBindingUpdateTimer

(

ElektraIoTimerOperation *

timerOp

)

Notifiy I/O binding about changes to timer structure.

Parameters

timerOp

timer operation handle

Return values

1	on success
0	on error

elektraIoContract()

int elektraIoContract	(	KeySet *	contract,
		ElektraIoInterface *	ioBinding
	)

Creates a contract for use with kdbOpen() that sets up an I/O binding.

When you call kdbOpen() with this contract, the KDB instance will use ioBinding as its I/O binding.

Parameters

contract	The keyset into which the contract is written.
ioBinding	The ioBinding to use.

Return values

-1	if contract or ioBinding are NULL
0	on success

elektraIoFdGetBinding()

ElektraIoInterface* elektraIoFdGetBinding

(

ElektraIoFdOperation *

fdOp

)

Get binding from operation.

Parameters

fdOp	fd operation handle

Returns

pointer to binding or NULL on error

elektraIoFdGetBindingData()

void* elektraIoFdGetBindingData

(

ElektraIoFdOperation *

fdOp

)

Get private binding data from operation.

Parameters

fdOp	file descriptor operation handle

Returns

pointer to data or NULL on error

elektraIoFdGetCallback()

ElektraIoFdCallback elektraIoFdGetCallback

(

ElektraIoFdOperation *

fdOp

)

Get callback of file descriptor watch operation.

Parameters

fdOp	file descriptor operation handle

Returns

callback

elektraIoFdGetData()

void* elektraIoFdGetData

(

ElektraIoFdOperation *

fdOp

)

Get private data from operation.

Parameters

fdOp	file descriptor operation handle

Returns

pointer to data or NULL on error

elektraIoFdGetFd()

int elektraIoFdGetFd

(

ElektraIoFdOperation *

fdOp

)

Get file descriptor number from operation.

Parameters

fdOp	file descriptor operation handle

Returns

file descriptor number or 0 on error

elektraIoFdGetFlags()

int elektraIoFdGetFlags

(

ElektraIoFdOperation *

fdOp

)

Get flag bitmask of file descriptor watch operation.

Parameters

fdOp	file descriptor operation handle

Returns

watch flag bitmask (see ElektraIoFdFlags).

elektraIoFdIsEnabled()

int elektraIoFdIsEnabled

(

ElektraIoFdOperation *

fdOp

)

Check if file descriptor watch operation is enabled or disabled.

Parameters

fdOp	file descriptor operation handle

Return values

0	if disabled
1	if enabled

elektraIoFdSetBindingData()

int elektraIoFdSetBindingData	(	ElektraIoFdOperation *	fdOp,
		void *	data
	)

Set private binding data for operation.

Parameters

fdOp	file descriptor operation handle
data	pointer to data

Return values

1	on success
0	on error

elektraIoFdSetEnabled()

int elektraIoFdSetEnabled	(	ElektraIoFdOperation *	fdOp,
		int	enabled
	)

Enable or disable file descriptor watch operation.

Parameters

fdOp	file descriptor operation handle
enabled	0 to disabled, any other value for enabled

Return values

1	on success
0	on error

elektraIoFdSetFlags()

int elektraIoFdSetFlags	(	ElektraIoFdOperation *	fdOp,
		int	flags
	)

Update flag bitmask of file descriptor watch operation.

Parameters

fdOp	file descriptor operation handle
flags	watch flag bitmask (see ElektraIoFdFlags).

Return values

1	on success
0	on error

elektraIoGetBinding()

ElektraIoInterface* elektraIoGetBinding

(

KDB *

kdb

)

Get I/O binding for asynchronous I/O operations for KDB instance.

Returns NULL if no I/O binding was set.

Parameters

kdb	KDB instance

Returns

I/O binding or NULL

elektraIoIdleGetBinding()

ElektraIoInterface* elektraIoIdleGetBinding

(

ElektraIoIdleOperation *

idleOp

)

Get binding from operation.

Parameters

idleOp

idle operation handle

Returns

pointer to binding or NULL on error

elektraIoIdleGetBindingData()

void* elektraIoIdleGetBindingData

(

ElektraIoIdleOperation *

idleOp

)

Get private binding data from operation.

Parameters

idleOp

idle operation handle

Returns

pointer to data or NULL on error

elektraIoIdleGetCallback()

ElektraIoIdleCallback elektraIoIdleGetCallback

(

ElektraIoIdleOperation *

idleOp

)

Get callback of idle operation.

Parameters

idleOp

idle operation handle

Returns

callback

elektraIoIdleGetData()

void* elektraIoIdleGetData

(

ElektraIoIdleOperation *

idleOp

)

Get private data from operation.

Parameters

idleOp

idle operation handle

Returns

pointer to data or NULL on error

elektraIoIdleIsEnabled()

int elektraIoIdleIsEnabled

(

ElektraIoIdleOperation *

idleOp

)

Check if idle operation is enabled or disabled.

Parameters

idleOp

idle operation handle

Return values

0	if disabled
1	if enabled

elektraIoIdleSetBindingData()

int elektraIoIdleSetBindingData	(	ElektraIoIdleOperation *	idleOp,
		void *	data
	)

Set private binding data for operation.

Parameters

idleOp	idle operation handle
data	pointer to data

Return values

1	on success
0	on error

elektraIoIdleSetEnabled()

int elektraIoIdleSetEnabled	(	ElektraIoIdleOperation *	idleOp,
		int	enabled
	)

Enable or disable idle operation.

Parameters

idleOp	idle operation handle
enabled	0 to disabled, any other value for enabled

Return values

1	on success
0	on error

elektraIoNewBinding()

ElektraIoInterface* elektraIoNewBinding	(	ElektraIoBindingAddFd *	addFd,
		ElektraIoBindingUpdateFd *	updateFd,
		ElektraIoBindingRemoveFd *	removeFd,
		ElektraIoBindingAddTimer *	addTimer,
		ElektraIoBindingUpdateTimer *	updateTimer,
		ElektraIoBindingRemoveTimer *	removeTimer,
		ElektraIoBindingAddIdle *	addIdle,
		ElektraIoBindingUpdateIdle *	updateIdle,
		ElektraIoBindingRemoveIdle *	removeIdle,
		ElektraIoBindingCleanup *	cleanup
	)

Create a new I/O binding.

Make sure to free returned data in ElektraIoBindingCleanup.

Parameters

addFd	function for adding a file descriptor watch operation
updateFd	function for updating a file descriptor operation
removeFd	function for removing a file descriptor operation
addTimer	function for adding a timer operation
updateTimer	function for updateing a timer operation
removeTimer	function for removing a timer operation
addIdle	function for adding an idle operation
updateIdle	function for updating an idle operation
removeIdle	function for removing an idle operation
cleanup	function for cleaning up binding data

Returns

newly created binding

elektraIoNewFdOperation()

ElektraIoFdOperation* elektraIoNewFdOperation	(	int	fd,
		int	flags,
		int	enabled,
		ElektraIoFdCallback	callback,
		void *	data
	)

Create a new file descriptor watch operation.

Free returned data after use.

Parameters

fd	file descriptor number
flags	watch flag bitmask (see ElektraIoFdFlags). Select on which file descriptor state changes the callback should be invoked
enabled	0 to disabled, any other value for enabled
callback	Called when file descriptor state has changes
data	Custom private data

Returns

file descriptor operation handle

elektraIoNewIdleOperation()

ElektraIoIdleOperation* elektraIoNewIdleOperation	(	int	enabled,
		ElektraIoIdleCallback	callback,
		void *	data
	)

Create a new idle operation.

Free returned data after use.

Parameters

enabled	0 to disable, any other value for enabled
callback	Called when file descriptor state has changes
data	Custom private data

Returns

idle operation handle

elektraIoNewTimerOperation()

ElektraIoTimerOperation* elektraIoNewTimerOperation	(	unsigned int	interval,
		int	enabled,
		ElektraIoTimerCallback	callback,
		void *	data
	)

Create a new timer operation.

Free returned data after use.

Parameters

interval	timer interval in milliseconds
enabled	0 to disable, any other value for enabled
callback	Called when file descriptor state has changes
data	Custom private data

Returns

timer operation handle

elektraIoTimerGetBinding()

ElektraIoInterface* elektraIoTimerGetBinding

(

ElektraIoTimerOperation *

timerOp

)

Get binding from operation.

Parameters

timerOp

timer operation handle

Returns

pointer to binding or NULL on error

elektraIoTimerGetBindingData()

void* elektraIoTimerGetBindingData

(

ElektraIoTimerOperation *

timerOp

)

Get private binding data from operation.

Parameters

timerOp

timer operation handle

Returns

pointer to data or NULL on error

elektraIoTimerGetCallback()

ElektraIoTimerCallback elektraIoTimerGetCallback

(

ElektraIoTimerOperation *

timerOp

)

Get callback of timer operation.

Parameters

timerOp

timer operation handle

Returns

callback

elektraIoTimerGetData()

void* elektraIoTimerGetData

(

ElektraIoTimerOperation *

timerOp

)

Get private data from operation.

Parameters

timerOp

timer operation handle

Returns

pointer to data or NULL on error

elektraIoTimerGetInterval()

unsigned int elektraIoTimerGetInterval

(

ElektraIoTimerOperation *

timerOp

)

Get interval of timer operation.

Parameters

timerOp

timer operation handle

Returns

timer interval in milliseconds, 0 on error

elektraIoTimerIsEnabled()

int elektraIoTimerIsEnabled

(

ElektraIoTimerOperation *

timerOp

)

Check if timer operation is enabled or disabled.

Parameters

timerOp

timer operation handle

Return values

0	if disabled
1	if enabled

elektraIoTimerSetBindingData()

int elektraIoTimerSetBindingData	(	ElektraIoTimerOperation *	timerOp,
		void *	data
	)

Set private binding data for operation.

Parameters

timerOp	timer operation handle
data	pointer to data

Return values

1	on success
0	on error

elektraIoTimerSetEnabled()

int elektraIoTimerSetEnabled	(	ElektraIoTimerOperation *	timerOp,
		int	enabled
	)

Enable or disable timer operation.

Parameters

timerOp	timer operation handle
enabled	0 to disabled, any other value for enabled

Return values

1	on success
0	on error

elektraIoTimerSetInterval()

int elektraIoTimerSetInterval	(	ElektraIoTimerOperation *	timerOp,
		unsigned int	interval
	)

Update interval of timer operation.

Parameters

timerOp	timer operation handle
interval	timer interval in milliseconds

Return values

1	on success
0	on error