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Ensure that the fd returned by the connect method is closed before
running external programs.
http://article.gmane.org/gmane.linux.ppp/1371
diff -ruNp ppp.orig/pppd/main.c ppp/pppd/main.c
--- ppp.orig/pppd/main.c 2004-07-12 12:55:30.000000000 +0200
+++ ppp/pppd/main.c 2004-07-12 12:55:25.000000000 +0200
@@ -1662,6 +1662,8 @@ run_program(prog, args, must_exist, done
closelog();
if (the_channel->close)
(*the_channel->close)();
+ else
+ close(devfd);
/* Don't pass handles to the PPP device, even by accident. */
dup2(fd_devnull, 0);
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