HP Advanced Communications Controllers (ACC) manual 308

ZCOM C I/F Library Routines

ZSEND (3X)

cancellation point	Thread cancellation can occur when a thread
	calls this routine.
async-cancel unsafe	The calling thread’s cancelability type must be
	PTHREAD_CANCEL_DEFERRED if
	cancellation is enabled.
async-signal unsafe	It cannot be called from a signal handler.
fork unsafe	It cannot be called by a child process after
	fork(2) but before exec(2).

308 Chapter 4