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socket.7: select()/poll()/epoll honor SO_RCVLOWAT since Linux 2.6.28 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2019-05-31 16:45:51 +02:00
parent defef3518e
commit 44a0081973
1 changed files with 10 additions and 6 deletions
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16
man7/socket.7
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@ -764,15 +764,19 @@ fails with the error
.B SO_RCVLOWAT
is changeable
only since Linux 2.4.
The
.BR select (2)
.IP
Before Linux 2.6.28
.\" commit c7004482e8dcb7c3c72666395cfa98a216a4fb70
.BR select (2),
.BR poll (2),
and
.BR poll (2)
system calls currently do not respect the
.BR epoll (7)
did not respect the
.B SO_RCVLOWAT
setting on Linux,
and mark a socket readable when even a single byte of data is available.
A subsequent read from the socket will block until
and indicated a socket as readable when even a single byte of data
was available.
A subsequent read from the socket would then block until
.B SO_RCVLOWAT
bytes are available.
.\" See http://marc.theaimsgroup.com/?l=linux-kernel&m=111049368106984&w=2