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#!/usr/bin/perl
#
# count_pf.perl5 -- run lsof in repeat mode and count processes and
#                   files

sub interrupt { print "\n"; exit 0; }

$RPT = 15;                              # lsof repeat time

# Set path to lsof.

if (($LSOF = &isexec("../lsof")) eq "") {       # Try .. first
    if (($LSOF = &isexec("lsof")) eq "") {      # Then try . and $PATH
        print "can't execute $LSOF\n"; exit 1
    }
}

# Read lsof -nPF0 output repeatedly from a pipe.

$| = 1;                                 # unbuffer output
$SIG{'INT'} = 'interrupt';              # catch interrupt
$proc = $files = $tcp = $udp = 0;
$progress="/";
open(P, "$LSOF -nPF0 -r $RPT|") || die "can't open pipe to $LSOF\n";

LSOF_LINE:

while (<P>) {
    chop;
    if (/^m/) {

    # A marker line signals the end of an lsof repetition.

        printf "%s  Processes: %5d,  Files: %6d,  TCP: %6d, UDP: %6d\r",
            $progress, $proc, $files, $tcp, $udp;
        $proc = $files = $tcp = $udp = 0;
        if ($progress eq "/") { $progress = "\\"; } else { $progress = "/"; }
        next LSOF_LINE;
    }
    if (/^p/) {

    # Count process.

        $proc++;
        next LSOF_LINE;
    }
    if (/^f/) {

    # Count files.

        $files++;
        @F = split("\0", $_, 999);
        foreach $i (0 .. ($#F - 1)) {

        # Search for protocol field.

            if ($F[$i] =~ /^P(.*)/) {

            # Count instances of TCP and UDP protocols.

                if ($1 eq "TCP") { $tcp++; }
                elsif ($1 eq "UDP") { $udp++; }
                next LSOF_LINE;
            }
        }
    }
}


## isexec($path) -- is $path executable
#
# $path   = absolute or relative path to file to test for executabiity.
#           Paths that begin with neither '/' nor '.' that arent't found as
#           simple references are also tested with the path prefixes of the
#           PATH environment variable.  

sub
isexec {
    my ($path) = @_;
    my ($i, @P, $PATH);

    $path =~ s/^\s+|\s+$//g;
    if ($path eq "") { return(""); }
    if (($path =~ m#^[\/\.]#)) {
        if (-x $path) { return($path); }
        return("");
    }
    $PATH = $ENV{PATH};
    @P = split(":", $PATH);
    for ($i = 0; $i <= $#P; $i++) {
        if (-x "$P[$i]/$path") { return("$P[$i]/$path"); }
    }
    return("");
}

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