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FD_SET, FD_CLR, FD_ISSET, FD_ZERO are often expected to be macros and not functions. In addition we already have a file dedicated to such macros and types used by syscalls, it's types.h, so let's move them there and turn them to macros. FD_CLR() and FD_ISSET() were missing, so they were added. FD_ZERO() now deals with its own loop so that it doesn't rely on memset() that sets one byte at a time. Cc: David Laight <David.Laight@aculab.com> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>