mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
|
From: Simon Peter <dn.tlp@gmx.net>
|
||
|
|
Subject: Bug#306261: pppd does not properly close /dev/ppp on persist
|
||
|
|
|
||
|
|
When using the kernel PPPoE driver, pppd never
|
||
|
|
closes /dev/ppp when the link has come down.
|
||
|
|
|
||
|
|
It opens superfluous fds to the device each time it re-opens the
|
||
|
|
connection, with the unclosed ones falsely reported always ready for
|
||
|
|
data by select().
|
||
|
|
|
||
|
|
This makes pppd eat up 100% CPU time after the first persist because of
|
||
|
|
the always instantly returning select() on the unclosed fds.
|
||
|
|
|
||
|
|
The problem also occurs with the upstream version, but does not occur
|
||
|
|
when a pty/tty device is used for the ppp connection.
|
||
|
|
|
||
|
|
|
||
|
|
diff -u -r ppp-2.4.3/pppd/sys-linux.c ppp-2.4.3/pppd/sys-linux.c
|
||
|
|
--- ppp-2.4.3/pppd/sys-linux.c 2005-04-29 20:08:37.000000000 +0200
|
||
|
|
+++ ppp-2.4.3/pppd/sys-linux.c 2005-04-29 20:07:03.000000000 +0200
|
||
|
|
@@ -455,6 +455,13 @@
|
||
|
|
if (new_style_driver) {
|
||
|
|
int flags;
|
||
|
|
|
||
|
|
+ /* if a ppp_fd is already open, close it first */
|
||
|
|
+ if(ppp_fd > 0) {
|
||
|
|
+ close(ppp_fd);
|
||
|
|
+ remove_fd(ppp_fd);
|
||
|
|
+ ppp_fd = -1;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
/* Open an instance of /dev/ppp and connect the channel to it */
|
||
|
|
if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
|
||
|
|
error("Couldn't get channel number: %m");
|