Send notifications to queued clients
#include <sys/iofunc.h> void iofunc_notify_trigger( iofunc_notify_t *nop, int count, int index );
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The iofunc_notify_trigger() function examines all entries given in the list maintained at nop [index] to see if the event should be delivered to the client. If the specified count is greater than or equal to the trigger count for the particular notification list element, this function calls MsgDeliverEvent() to deliver the event to the client whose rcvid is stored in the notification list element, and the list element is disarmed.
Note that if the client has specified a code of SI_NOTIFY, then the value that the client specified (e.g. the value member of the struct sigevent) has the top three bits ORed with the reason for the trigger (this is the expression _NOTIFY_COND_INPUT << index), as in the following table:
If the client has specified a code of something other than SI_NOTIFY then this routine doesn't modify the value member in any way.
The sys/iofunc.h file also defines the IOFUNC_NOTIFY_INPUT_CHECK(), IOFUNC_NOTIFY_OUTPUT_CHECK(), and IOFUNC_NOTIFY_OBAND_CHECK() macros, which you can use to see if there are enough bytes in the lists to make it worthwhile to call iofunc_notify_trigger() to notify clients about:
#define IOFUNC_NOTIFY_INPUT_CHECK(__nop, __cnt, __tran) ... #define IOFUNC_NOTIFY_OUTPUT_CHECK(__nop, __cnt) ... #define IOFUNC_NOTIFY_OBAND_CHECK(__nop, __cnt, __tran) ...
The arguments are:
See Writing a Resource Manager
iofunc_notify(), iofunc_notify_remove(), sigevent
“Handling ionotify() and select()” in the Handling Other Messages chapter of Writing a Resource Manager
Resource Managers chapter of Getting Started with QNX Neutrino