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ipv6.7: Add description of getsockopt() for IPV6_MTU 

In IPv4,IP_MTU is only supported by getsockopt.
In IPv6, we can use IPV6_MTU to set socket's MTU,
but the return value of getsockopt() is the path MTU.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Gao Feng 2012-12-15 19:52:49 +01:00 committed by Michael Kerrisk
parent 993d1ce33e
commit 032e1ba5c0
1 changed files with 5 additions and 1 deletions
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man7/ipv6.7
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@ -80,7 +80,7 @@ structure.
.\" commit c4062dfc425e94290ac427a98d6b4721dd2bc91f
.\" Author: Erich E. Hoover <ehoover@mines.edu>
.\"
.TH IPV6 7 2012-11-07 "Linux" "Linux Programmer's Manual"
.TH IPV6 7 2012-12-16 "Linux" "Linux Programmer's Manual"
.SH NAME
ipv6 \- Linux IPv6 protocol implementation
.SH SYNOPSIS
@ -215,6 +215,10 @@ Argument is a pointer to a
.I struct ipv6_mreq
.TP
.B IPV6_MTU
Retrieve the current known path MTU of the current socket.
Only valid when the socket has been connected.
Returns an integer.
Set the MTU to be used for the socket.
The MTU is limited by the device
MTU or the path MTU when path MTU discovery is enabled.