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authorJan Klötzke <jan@kloetzke.net>2019-12-16 22:56:52 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2020-11-22 14:33:58 +0100
commitd560030548cb237f9ef09a82fd6f372836655306 (patch)
tree6a6ca861cc0e533a6a77617f9fbed039dab16d08
parente3f4759019544673d654ad8a1ea256ed481fa5e3 (diff)
downloadbusybox-d560030548cb237f9ef09a82fd6f372836655306.tar.gz
mdev: re-initialize if uevent messages were lost
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 <jan@kloetzke.net> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--util-linux/mdev.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index 4c00a2d7e..d4f06c128 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -1199,6 +1199,16 @@ 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;