In sys/sys/poll.h, I see (in 1.4T, -current according to cvsweb, and everything I've checked in between):
#define POLLIN 0x0001 #define POLLPRI 0x0002 #define POLLOUT 0x0004 #define POLLRDNORM 0x0040 #define POLLWRNORM POLLOUT #define POLLRDBAND 0x0080 #define POLLWRBAND 0x0100 I can understand treating POLLWRNORM as identical to POLLOUT. But why the distinction between POLLRDNORM and POLLIN? Might anyone know the reason and be willing to explain? Not that it matters tremendously. But I'm curious, because it indicates there's something I don't understand somewhere there. The wording is a bit confusing. In -current's poll(2), POLLIN is said to be synonymous with POLLRDNORM (and POLLOUT with POLLWRNORM); in 1.4T and 5.2, there is confusing wording about "high priority data" and "data with a non-zero priority", which may or may not be talking about the same thing and may or may not map onto other concepts such as TCP's push semantics, and the wording is different in the two directions. -current's manpage's BUGS entry implies, to me, that this distinction is something of a historical accident that should be fixed, but, even if that reading is correct, I'd still be curious where it came from. /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mo...@rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
