64 lines
1.9 KiB
Diff
64 lines
1.9 KiB
Diff
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diff -ur man-pages-3.43.orig/man7/tcp.7 man-pages-3.43/man7/tcp.7
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--- man-pages-3.43.orig/man7/tcp.7 2012-10-15 11:13:50.000000000 +0200
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+++ man-pages-3.43/man7/tcp.7 2012-10-25 19:37:24.084706083 +0200
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@@ -820,7 +820,58 @@
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socket options are valid on TCP sockets.
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For more information see
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.BR ip (7).
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-.\" FIXME Document TCP_CONGESTION (new in 2.6.13)
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+.TP
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+.BR TCP_CONGESTION " (since Linux 2.6.13)"
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+Get or set the congestion-control algorithm for this socket.
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+The
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+.I optval
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+argument is a pointer to a character-string buffer.
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+
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+For
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+.BR getsockopt ()
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+.I *optlen
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+specifies the amount of space available in the buffer pointed to by
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+.IR optval ,
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+which should be at least 16 bytes (defined by the kernel-internal constant
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+.BR TCP_CA_NAME_MAX ).
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+On return, the buffer pointed to by
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+.I optval
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+is set to a null-terminated string containing the name of the
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+congestion-control algorithm for this socket, and
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+.I *optlen
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+is set to the minimum of its original value and
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+.BR TCP_CA_NAME_MAX .
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+If the value passed in
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+.I *optlen
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+is too small, then the string returned in
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+.I *optval
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+is silently truncated, and no terminating null byte is added.
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+If an empty string is returned, then the socket is using the default
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+congestion-control algorithm, determined as described under
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+.I tcp_congestion_control
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+above.
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+
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+For
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+.BR setsockopt ()
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+.I optlen
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+specifies the length of the congestion-control algorithm name
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+contained in the buffer pointed to by
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+.IR optval ;
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+this length need not include any terminating null byte.
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+The algorithm "reno" is always permitted;
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+other algorithms may be available, depending on kernel configuration.
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+Possible errors from
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+.BR setsockopt ()
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+include:
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+algorithm not found/available
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+.RB ( ENOENT );
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+setting this algorithm requires the
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+.B CAP_NET_ADMIN
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+capability
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+.RB ( EPERM );
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+and failure getting kernel module
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+.RB ( EBUSY ).
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+.I
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.TP
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.BR TCP_CORK " (since Linux 2.2)"
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.\" precisely: since 2.1.127
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