Commit a8dc1ebd authored by Lennart Poettering's avatar Lennart Poettering Committed by Simon McVittie

sysdeps: increase listen() backlog of AF_UNIX sockets to SOMAXCONN

Previously, the listen() backlog was set to an arbitrary 30. This means
that if dbus-daemon is overloaded only 30 more connections may be queued
by the kernel, before connect() fails with EAGAIN. (Note that EAGAIN !=
EINPROGRESS -- the latter is what is returned if a connection is queued
and being processed for asynchronous sockets; EAGAIN in this case is
really an error, that cannot be recovered from).

Most software simply sets SOMAXCONN as backlog for AF_UNIX sockets, to
allow queuing of as many connections as the kernel allows. SOMAXCONN is
128 on Linux, which is not particularly high, but at least higher than

This patch changes dbus-daemon to do the same.

I noticed this when flooding dbus-daemon with a lot of connections,
where it pretty quickly ceased to respond, much earlier than it really

Note that the backlog has nothing to do with the number of concurrent
connections allowed, it simply controls how many queued, but not
accept()ed connections there may be on the listening socket.

(cherry picked from commit 12bd6e89)
Bug-Debian: Simon McVittie's avatarSimon McVittie <>
Reviewed-by: Thiago Macieira's avatarThiago Macieira <>
parent 3cf2d6a1
......@@ -1195,7 +1195,7 @@ _dbus_listen_unix_socket (const char *path,
return -1;
if (listen (listen_fd, 30 /* backlog */) < 0)
if (listen (listen_fd, SOMAXCONN /* backlog */) < 0)
dbus_set_error (error, _dbus_error_from_errno (errno),
"Failed to listen on socket \"%s\": %s",
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