S3D_CLEAR_CALLBACK(3) s3d Manual S3D_CLEAR_CALLBACK(3)NAME
s3d_clear_callback - clears a callback
SYNOPSIS
#include <s3d.h>
void s3d_clear_callback(uint8_t event);
DESCRIPTION
Clears the callback which is associated with the event.
AUTHOR
Simon Wunderlich
Author of s3d
s3dS3D_CLEAR_CALLBACK(3)
Check Out this Related Man Page
EvmCallback(5) File Formats Manual EvmCallback(5)NAME
EvmCallback() - event management (EVM) callback function
SYNOPSIS DESCRIPTION
An EVM callback function is a function that you provide to allow your program to handle messages arriving on an EVM connection. Most mes-
sages are incoming events or responses to requests you have made to the EVM daemon, but you may also get a callback for other reasons.
Specify the name (EventCB) of the callback function in the callback parameter when you create an EVM connection with a response mode of
callback.
Your callback function is invoked by which you must call whenever you detect activity pending on the connection.
An EVM callback function must conform to the prototype shown.
Callback Function Parameters
o The connection parameter contains the connection context pertaining to this callback. This value was returned by when the connection
was created. If you have one callback function servicing multiple connections, you might test this to determine which connection a
particular invocation is handling.
o The callbackArg parameter contains the value you specified as the callbackArg parameter to when you created the connection. For exam-
ple, you might use it to hold a pointer to your own context data for the connection.
o The callbackData parameter points to a structure containing the details of the callback. The structure includes a callback reason
code, an event, and a union containing data specific to each possible reason. The event member may contain NULL if it is not applica-
ble to the reason. You may get these reasons:
This callback reason indicates that the daemon was unable to
deliver one or more events, probably because the client process had not finished processing earlier events, causing the connec-
tion buffer to overflow.
If necessary, you can use to increase the size of the receive buffer. See the EvmConnControl(3) reference page.
This callback reason indicates that an EVM event has been received from
the daemon. The event is available in the structure. You must use to free the event when you have finished with it. See the
EvmEventDestroy(3) reference page.
This callback reason indicates that a prior
call has completed, usually with a response from the daemon if the responseMode was specified as when the connection was cre-
ated. The posting status is available in the structure.
This callback reason indicates that a requested template has been
delivered in response to an request. You must use to free the template when you have finished with it.
This callback reason indicates that a prior
call has completed, usually with a response from the daemon.
This callback reason indicates that event template information has
been delivered in response to an request.
The template is available in the structure. You must use to free the template when you have finished with it.
FILES
Header file that contains the event declaration, structures, and prototype
for the callback function
SEE ALSO
Routines
EvmConnCheck(3), EvmConnCreate(3), EvmConnSubscribe(3), EvmEventPost(3).
Event Management
EVM(5).
Event Connection
EvmConnection(5).
EVM EventsEvmEvent(5).
EvmCallback(5)
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