an otherwise idle connection. A value of 0 uses the system default.
This parameter is supported only on systems that support the
<symbol>TCP_KEEPIDLE</> or <symbol>TCP_KEEPALIVE</> symbols, and on
- Windows; on other systems, it must be zero. This parameter is ignored
- for connections made via a Unix-domain socket.
+ Windows; on other systems, it must be zero.
+ In sessions connected via a Unix-domain socket, this parameter is
+ ignored and always reads as zero.
</para>
<note>
<para>
otherwise idle connection. A value of 0 uses the system default.
This parameter is supported only on systems that support the
<symbol>TCP_KEEPINTVL</> symbol, and on Windows; on other systems, it
- must be zero. This parameter is ignored for connections made via a
- Unix-domain socket.
+ must be zero.
+ In sessions connected via a Unix-domain socket, this parameter is
+ ignored and always reads as zero.
</para>
<note>
<para>
Specifies the number of keepalive packets to send on an otherwise idle
connection. A value of 0 uses the system default. This parameter is
supported only on systems that support the <symbol>TCP_KEEPCNT</>
- symbol; on other systems, it must be zero. This parameter is ignored
- for connections made via a Unix-domain socket.
+ symbol; on other systems, it must be zero.
+ In sessions connected via a Unix-domain socket, this parameter is
+ ignored and always reads as zero.
</para>
<note>
<para>