HelenOS sources

sigval             91 uspace/lib/posix/include/posix/signal.h 	union sigval si_value;
sigval             58 uspace/lib/posix/include/posix/ucontext.h 	union sigval sigev_value; /* Signal value. */
sigval             59 uspace/lib/posix/include/posix/ucontext.h 	void (*sigev_notify_function)(union sigval); /* Notification function. */