SIGINFO stuff in tcpdump?

[Guy Harris <gharris () sonic net>]

This change

        revision 1.166
        date: 2001/07/04 22:03:13;  author: fenner;  state: Exp;  lines: +42 -13
        Add SIGINFO handler from LBL
        The rest of the low-level print-*.c handlers need the infodelay
         wrapping too.

was checked in to tcpdump.c a bit more than a year ago.

Was it LBL's intention that ^T *not* do anything if you're capturing to
a file?  It seems to me that printing packet counts when capturing to a
file is more useful than printing packet counts when printing packets;
in the latter case, you can see the packets arrive (unless you're
directing the output to a file), but, in the former case, tcpdump just
silently writes packets out and says nothing until you ^C it.
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