TCP push missing with writev()

From: Ben Mansell (ben@zeus.com)
Date: Thu Nov 30 2000 - 12:35:41 EST


(possibly treading on ground covered before:
 http://www.uwsg.iu.edu/hypermail/linux/kernel/9904.1/0304.html )

To be brief and to the point: Should there be any difference between the
following two ways of writing data to a TCP socket?

1) write( fd, buffer, length )
2) writev( fd, {buffer, length}, {NULL,0} )

The problem is that if data happens to be written via method (2), then
the PUSH flag is never set on any packets generated. This is a bug,
surely?

(Occurs on 2.2.5 and 2.4.0-test10. Doesn't occur in 2.0.36 and lots of
 other UNIX-alikes)

Ben

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