Manual Pages  — SET_CONSTRAINT_HANDLER_S

The runtime-constraint handler is the callback function invoked when a library function detects a runtime-constraint violation.

The arguments are as follows:

msg
	A pointer to a character string describing the runtime-constraint violation.
ptr
	A NULL pointer.
error
	If the function calling the handler has a return type declared as errno_t, the return value of the function is passed. Otherwise, a positive value of type errno_t is passed.

Only the most recent handler registered with set_constraint_handler_s() is called when a runtime-constraint violation occurs.

The implementation has a default constraint handler that is used if no calls to the set_constraint_handler_s() function have been made. If the handler argument to set_constraint_handler_s() is a NULL pointer, the default handler becomes the current constraint handler.

The abort_handler_s() and ignore_handler_s() are the standard-defined runtime-constraint handlers provided by the C library.