MEDIUM: listener: implement a per-protocol pause() function
In order to fix the abstact socket pause mechanism during soft restarts,
we'll need to proceed differently depending on the socket protocol. The
pause_listener() function already supports some protocol-specific handling
for the TCP case.
This commit makes this cleaner by adding a new ->pause() function to the
protocol struct, which, if defined, may be used to pause a listener of a
given protocol.
For now, only TCP has been adapted, with the specific code moved from
pause_listener() to tcp_pause_listener().
(cherry picked from commit 092d865c53de80afc847c5ff0a079b414041ce2a)
diff --git a/include/types/protocol.h b/include/types/protocol.h
index e03692a..74b20e8 100644
--- a/include/types/protocol.h
+++ b/include/types/protocol.h
@@ -60,6 +60,7 @@
int (*get_src)(int fd, struct sockaddr *, socklen_t, int dir); /* syscall used to retrieve src addr */
int (*get_dst)(int fd, struct sockaddr *, socklen_t, int dir); /* syscall used to retrieve dst addr */
int (*drain)(int fd); /* indicates whether we can safely close the fd */
+ int (*pause)(struct listener *l); /* temporarily pause this listener for a soft restart */
struct list listeners; /* list of listeners using this protocol */
int nb_listeners; /* number of listeners */