[comp.unix.questions] exceptfds in select

avalon@phoenix.pub.uu.oz.au (Darren Reed) (12/21/90)

does anyone know what the exceptfds parameters in the select(2) call are
used for ?  the readfds and writefds are fairly self explanatory, but
I've never seen any source code the uses exceptfds in any useful way
(usually represented by a null pointer of some kind).

thanks in advance,

-avalon

rstevens@noao.edu (Rich Stevens) (12/22/90)

The only ones I've seen, on a vanilla 4.3BSD system, are (1) arrival of
out-of-band data for a socket, and (2) the presence of control-status
information to be read from the master side of a pseudo-terminal that
has been put into packet mode.

	Rich Stevens