FM / examples

/usr/share/doc/lsof/examples

Name	Size	Mode	Actions
00MANIFEST	1807	0644	edit dl rm
00README	2045	0644	edit dl rm
big_brother.perl5.gz	2078	0644	edit dl rm
count_pf.perl	1849	0755	edit dl rm
count_pf.perl5	2022	0755	edit dl rm
identd.perl5	3304	0755	edit dl rm
idrlogin.perl.gz	2222	0644	edit dl rm
idrlogin.perl5.gz	2270	0644	edit dl rm
list_fields.awk.gz	1764	0644	edit dl rm
list_fields.perl.gz	1751	0644	edit dl rm
list_NULf.perl5.gz	1836	0644	edit dl rm
shared.perl5.gz	3571	0644	edit dl rm
sort_res.perl5	3719	0755	edit dl rm
watch_a_file.perl	2235	0755	edit dl rm
xusers.awk	3975	0755	edit dl rm

Edit: /usr/share/doc/lsof/examples/watch_a_file.perl (2235B)

#!/usr/bin/perl
#
# watch_a_file.perl -- use lsof -F output to watch a specific file
#		       (or file system)
#
# usage:	watch_a_file.perl file_name

## Interrupt handler

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

## Start main program

$Pn = "watch_a_file";
# Check file argument.

if ($#ARGV != 0) { print "$#ARGV\n"; die "$Pn usage: file_name\n"; }
$fnm = $ARGV[0];
if (! -r $fnm) { die "$Pn: can't read $fnm\n"; }

# Do setup.

$RPT = 15;				# lsof repeat time
$| = 1;					# unbuffer output
$SIG{'INT'} = 'interrupt';		# catch interrupt

# 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 -nPF output from a pipe and gather the PIDs of the processes
# and file descriptors to watch.

open(P, "$LSOF -nPFpf $fnm|") || die "$Pn: can't pipe to $LSOF\n";

$curpid = -1;
$pids = "";
while (<P>) {
    chop;
    if (/^p(.*)/) { $curpid = $1; next; }	# Identify process.
    if (/^f/) {
	if ($curpid > 0) {
	    if ($pids eq "") { $pids = $curpid; }
	    else { $pids = $pids . "," . $curpid; }
	    $curpid = -1;
	}
    }
}
close(P);
wait;
if ($pids eq "") { die "$Pn: no processes using $fnm located.\n"; }
print "watch_file: $fnm being used by processes:\n\t$pids\n\n";

# Read repeated lsof output from a pipe and display.

$pipe = "$LSOF -ap $pids -r $RPT $fnm";
open(P, "$pipe|") || die "$Pn: can't pipe: $pipe\n";

while (<P>) { print $_; }
close(P);
print "$Pn: unexpected EOF from \"$pipe\"\n";
exit 1;

## 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("");
}

#!/usr/bin/perl # # watch_a_file.perl -- use lsof -F output to watch a specific file # (or file system) # # usage: watch_a_file.perl file_name ## Interrupt handler sub interrupt { wait; print "\n"; exit 0; } ## Start main program $Pn = "watch_a_file"; # Check file argument. if ($#ARGV != 0) { print "$#ARGV\n"; die "$Pn usage: file_name\n"; } $fnm = $ARGV[0]; if (! -r $fnm) { die "$Pn: can't read $fnm\n"; } # Do setup. $RPT = 15; # lsof repeat time $| = 1; # unbuffer output $SIG{'INT'} = 'interrupt'; # catch interrupt # Set path to lsof. if (($LSOF = &isexec("../lsof")) eq "") { # Try .. first if (($LSOF = &isexec("lsof")) eq "") { # Then try . and $PATH print "can't execute $LSOF\n"; exit 1 } } # Read lsof -nPF output from a pipe and gather the PIDs of the processes # and file descriptors to watch. open(P, "$LSOF -nPFpf $fnm|") || die "$Pn: can't pipe to $LSOF\n"; $curpid = -1; $pids = ""; while (

) { chop; if (/^p(.*)/) { $curpid = $1; next; } # Identify process. if (/^f/) { if ($curpid > 0) { if ($pids eq "") { $pids = $curpid; } else { $pids = $pids . "," . $curpid; } $curpid = -1; } } } close(P); wait; if ($pids eq "") { die "$Pn: no processes using $fnm located.\n"; } print "watch_file: $fnm being used by processes:\n\t$pids\n\n"; # Read repeated lsof output from a pipe and display. $pipe = "$LSOF -ap $pids -r $RPT $fnm"; open(P, "$pipe|") || die "$Pn: can't pipe: $pipe\n"; while (

) { print $_; } close(P); print "$Pn: unexpected EOF from \"$pipe\"\n"; exit 1; ## isexec($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(""); }