Sometimes when my modem hangs up, the following happens
in my syslog.
Jan 31 23:25:41 boggle pppd: tegetattr: I/O error(5)
Jan 31 21:26:12 boggle last message repeated 60412 times
Jan 31 21:26:22 boggle last message repeated 17172 times
Also pppd appears not to terminate normally, because
Jan 31 21:26:22 pppd:Exit
does not appear in the log. Regardless of the exit status
(0 or 1 or whatever), this line is supposed to be
logged before the program calls exit.