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git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1417 3c298f89-4303-0410-b956-a3cf2f4a3e73
35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
From: Simon Peter <dn.tlp@gmx.net>
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Subject: Bug#306261: pppd does not properly close /dev/ppp on persist
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When using the kernel PPPoE driver, pppd never
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closes /dev/ppp when the link has come down.
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It opens superfluous fds to the device each time it re-opens the
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connection, with the unclosed ones falsely reported always ready for
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data by select().
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This makes pppd eat up 100% CPU time after the first persist because of
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the always instantly returning select() on the unclosed fds.
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The problem also occurs with the upstream version, but does not occur
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when a pty/tty device is used for the ppp connection.
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diff -u -r ppp-2.4.3/pppd/sys-linux.c ppp-2.4.3/pppd/sys-linux.c
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--- ppp-2.4.3/pppd/sys-linux.c 2005-04-29 20:08:37.000000000 +0200
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+++ ppp-2.4.3/pppd/sys-linux.c 2005-04-29 20:07:03.000000000 +0200
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@@ -455,6 +455,13 @@
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if (new_style_driver) {
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int flags;
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+ /* if a ppp_fd is already open, close it first */
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+ if(ppp_fd > 0) {
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+ close(ppp_fd);
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+ remove_fd(ppp_fd);
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+ ppp_fd = -1;
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+ }
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+
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/* Open an instance of /dev/ppp and connect the channel to it */
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if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
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error("Couldn't get channel number: %m");
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