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It was totally unused. No implementation of the 'closing' method in a Plug vtable was checking it for any reason at all, except for ProxySocket which captured it from its client in order to pass on to its server (which, perhaps after further iterations of ProxySocket, would have ended up ignoring it similarly). And every caller of plug_closing set it to 0 (aka false), except for the one in sshproxy.c which passed true (but it would have made no difference to anyone). The comment in network.h refers to a FIXME comment which was in try_send() when that code was written (see winnet.c in commit 7b0e08270058390). That FIXME is long gone, replaced by a use of a toplevel callback. So I think the aim must have been to avoid re-entrancy when sk_write called try_send which encountered a socket error and called back to plug_closing - but that's long since fixed by other means now.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.