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Completely remove sk_flush().

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I've only just noticed that it doesn't do anything at all!

Almost every implementation of the Socket vtable provides a flush()
method which does nothing, optionally with a comment explaining why
it's OK to do nothing. The sole exception is the wrapper Proxy_Socket,
which implements the method during its setup phase by setting a
pending_flush flag, so that when its sub-socket is later created, it
can call sk_flush on that. But since the sub-socket's sk_flush will do
nothing, even that is completely pointless!

Source control history says that sk_flush was introduced by Dave
Hinton in 2001 (commit 7b0e08270), who was going to use it for some
purpose involving the SSL Telnet support he was working on at the
time. That SSL support was never finished, and its vestigial
declarations in network.h were removed in 2015 (commit 42334b65b). So
sk_flush is just another vestige of that abandoned work, which I
should have removed in the latter commit but overlooked.
This commit is contained in:
Simon Tatham
2019-07-28 10:32:17 +01:00
parent 5e2ac205fd
commit 9545199ea5
8 changed files with 1 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
unix/uxfdsock.c
View File

@ -229,12 +229,6 @@ static void fdsocket_write_eof(Socket *s)
fdsocket_try_send(fds);
}
static void fdsocket_flush(Socket *s)
{
/* FdSocket *fds = container_of(s, FdSocket, sock); */
/* do nothing */
}
static void fdsocket_set_frozen(Socket *s, bool is_frozen)
{
FdSocket *fds = container_of(s, FdSocket, sock);
@ -315,7 +309,6 @@ static const SocketVtable FdSocket_sockvt = {
fdsocket_write,
fdsocket_write_oob,
fdsocket_write_eof,
fdsocket_flush,
fdsocket_set_frozen,
fdsocket_socket_error,
NULL, /* peer_info */

9
unix/uxnet.c
View File

@ -492,14 +492,6 @@ static Plug *sk_net_plug(Socket *sock, Plug *p)
return ret;
}
static void sk_net_flush(Socket *s)
{
/*
* We send data to the socket as soon as we can anyway,
* so we don't need to do anything here. :-)
*/
}
static void sk_net_close(Socket *s);
static size_t sk_net_write(Socket *s, const void *data, size_t len);
static size_t sk_net_write_oob(Socket *s, const void *data, size_t len);
@ -514,7 +506,6 @@ static struct SocketVtable NetSocket_sockvt = {
sk_net_write,
sk_net_write_oob,
sk_net_write_eof,
sk_net_flush,
sk_net_set_frozen,
sk_net_socket_error,
sk_net_peer_info,