If the netlink read() failed with ENOBUFS we know that we have missed at
least one message due to a socket receive buffer overrun. The only way
how to recover is to drop the old socket, open a fresh one and make a
cold-plug scan of the current system state.
Signed-off-by: Jan Klötzke <j...@kloetzke.net>
---
util-linux/mdev.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index cfc1a38bc..91c4ff466 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -1206,6 +1206,16 @@ static void daemon_loop(char *temp, int fd)
len = safe_read(fd, netbuf, sizeof(netbuf) - 1);
if (len < 0) {
+ if (errno == ENOBUFS) {
+ /*
+ * We ran out of socket receive buffer space.
+ * Start from scratch.
+ */
+ dbg1s("uevent overrun! Rescanning...");
+ close(fd);
+ fd = daemon_init(temp);
+ continue;
+ }
bb_simple_perror_msg_and_die("read");
}
end = netbuf + len;
--
2.20.1
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