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pppd: Close already open ppp descriptors
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When using the kernel PPPoE driver in conjunction with the "persist" option,
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the already open descriptor to /dev/ppp is not closed when the link is
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reestablished. This eventually leads to high CPU load because the stray
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descriptors are always reported as ready by select().
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This patch closes the descriptor if it is already open when establishing a
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new connection. It originated from the Debian project.
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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--- a/pppd/sys-linux.c
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+++ b/pppd/sys-linux.c
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@@ -458,6 +458,13 @@ int generic_establish_ppp (int fd)
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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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