tt_pattern_callback_add - matching callback function
#include <Tt/tt_c.h> Tt_status tt_pattern_callback_add(Tt_pattern m, Tt_message_callback f);
ToolTalk Functions tt_pattern_callback_add(3) NAME tt_pattern_callback_add - register a message-matching callback function SYNOPSIS #include <Tt/tt_c.h> Tt_status tt_pattern_callback_add(Tt_pattern m, Tt_message_callback f); DESCRIPTION The tt_pattern_callback_add() function registers a callback function that will be automatically invoked by tt_message_receive(3) whenever a message matches the pattern. The callback is defined in <Tt/tt_c.h>. If the callback returns TT_CALLBACK_CONTINUE, other callbacks will be run; if no callback returns TT_CALLBACK_PROCESSED, tt_message_receive(3) returns the mes- sage. If the callback returns TT_CALLBACK_PROCESSED, no further call- backs will be invoked for this event; tt_message_receive(3) does not return the message. The m argument is the opaque handle for the pattern involved in this operation. The f argument is the message callback to be run. The application should check the tt_message_uid(3) and tt_mes- sage_gid(3) against the User ID and Group ID of the application receiv- ing the messsage. If the UID and/or GID of the application do not match that of the message then the receiving application should consider failing the message with TT_DESKTOP_EACCES. RETURN VALUE Upon successful completion, the tt_pattern_callback_add() function returns the status of the operation as one of the following Tt_status values: TT_OK The operation completed successfully. TT_ERR_NOMP The ttsession(1) process is not running and the ToolTalk service cannot restart it. TT_ERR_POINTER The pointer passed does not point to an object of the cor- rect type for this operation. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | library/tooltalk | +---------------+------------------+ |Stability | Committed | +---------------+------------------+ SEE ALSO tt_c(5), tt_pattern_register(3), tt_message_receive(3). ToolTalk 1.3 1 March 1996 tt_pattern_callback_add(3)