3 # This script processes strace -f output. It displays a graph of invoked
4 # subprocesses, and is useful for finding out what complex commands do.
6 # You will probably want to invoke strace with -q as well, and with
7 # -s 100 to get complete filenames.
9 # The script can also handle the output with strace -t, -tt, or -ttt.
10 # It will add elapsed time for each process in that case.
12 # This script is Copyright (C) 1998 by Richard Braakman <dark@xs4all.nl>.
14 # Redistribution and use in source and binary forms, with or without
15 # modification, are permitted provided that the following conditions
17 # 1. Redistributions of source code must retain the above copyright
18 # notice, this list of conditions and the following disclaimer.
19 # 2. Redistributions in binary form must reproduce the above copyright
20 # notice, this list of conditions and the following disclaimer in the
21 # documentation and/or other materials provided with the distribution.
22 # 3. The name of the author may not be used to endorse or promote products
23 # derived from this software without specific prior written permission.
25 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 # Scales for strace slowdown. Make configurable!
43 my $scale_factor = 3.5;
47 my ($pid, $call, $args, $result, $time, $time_spent);
54 if (s/^(\d\d):(\d\d):(\d\d)(?:\.(\d\d\d\d\d\d))? //) {
55 $time = $1 * 3600 + $2 * 60 + $3;
57 $time = $time + $4 / 1000000;
60 } elsif (s/^(\d+)\.(\d\d\d\d\d\d) //) {
61 $time = $1 + ($2 / 1000000);
65 if (s/ <unfinished ...>$//) {
66 $unfinished{$pid} = $_;
70 if (s/^<... \S+ resumed> //) {
71 unless (exists $unfinished{$pid}) {
72 print STDERR "$0: $ARGV: cannot find start of resumed call on line $.";
75 $_ = $unfinished{$pid} . $_;
76 delete $unfinished{$pid};
79 if (/^--- SIG(\S+) (.*) ---$/) {
80 # $pid received signal $1
81 # currently we don't do anything with this
85 if (/^\+\+\+ killed by SIG(\S+) \+\+\+$/) {
86 # $pid received signal $1
87 handle_killed($pid, $time);
91 if (/^\+\+\+ exited with (\d+) \+\+\+$/) {
93 # currently we don't do anything with this
97 ($call, $args, $result) = /(\S+)\((.*)\)\s+= (.*)$/;
98 if ($result =~ /^(.*) <([0-9.]*)>$/) {
99 ($result, $time_spent) = ($1, $2);
101 unless (defined $result) {
102 print STDERR "$0: $ARGV: $.: cannot parse line.\n";
106 handle_trace($pid, $call, $args, $result, $time);
118 if ($in =~ s/^\\(.)//) {
120 } elsif ($in =~ s/^\"//) {
121 if ($in =~ s/^\.\.\.//) {
122 return ("$result...", $in);
124 return ($result, $in);
125 } elsif ($in =~ s/([^\\\"]*)//) {
136 if ($in =~ s/^\"//) {
138 ($tmp, $in) = parse_str($in);
139 if (not defined $tmp) {
140 print STDERR "$0: $ARGV: $.: cannot parse string.\n";
144 } elsif ($in =~ s/^0x([[:xdigit:]]+)//) {
145 return (hex $1, $in);
146 } elsif ($in =~ s/^(\d+)//) {
147 return (int $1, $in);
149 print STDERR "$0: $ARGV: $.: unrecognized element.\n";
160 if ($in =~ s/^\[//) {
162 if ($in =~ s,^/\* (\d+) vars \*/\],,) {
165 while ($in !~ s/^\]//) {
166 ($tmp, $in) = parse_one($in);
167 defined $tmp or return undef;
169 unless ($in =~ /^\]/ or $in =~ s/^, //) {
170 print STDERR "$0: $ARGV: $.: missing comma in array.\n";
173 if ($in =~ s/^\.\.\.//) {
177 push @args, \@subarr;
179 } elsif ($in =~ s/^\{//) {
181 while ($in !~ s/^\}//) {
183 unless ($in =~ s/^(\w+)=//) {
184 print STDERR "$0: $ARGV: $.: struct field expected.\n";
188 ($tmp, $in) = parse_one($in);
189 defined $tmp or return undef;
190 $subhash{$key} = $tmp;
191 unless ($in =~ s/, //) {
192 print STDERR "$0: $ARGV: $.: missing comma in struct.\n";
196 push @args, \%subhash;
198 ($tmp, $in) = parse_one($in);
199 defined $tmp or return undef;
202 unless (length($in) == 0 or $in =~ s/^, //) {
203 print STDERR "$0: $ARGV: $.: missing comma.\n";
213 # process info, indexed by pid.
216 # seq clones, forks and execs for this pid, in sequence (array)
218 # filename and argv (from latest exec)
219 # basename (derived from filename)
220 # argv[0] is modified to add the basename if it differs from the 0th argument.
225 my ($pid, $call, $args, $result, $time) = @_;
226 my $pid_fqname = $pid . "-" . $time;
228 if (defined $time and not defined $running_fqname{$pid}) {
229 $pr{$pid_fqname}{start} = $time;
230 $running_fqname{$pid} = $pid_fqname;
233 $pid_fqname = $running_fqname{$pid};
235 if ($call eq 'execve') {
236 return if $result ne '0';
238 my ($filename, $argv) = parseargs($args);
239 my ($basename) = $filename =~ m/([^\/]*)$/;
240 if ($basename ne $$argv[0]) {
241 $$argv[0] = "$basename($$argv[0])";
243 my $seq = $pr{$pid_fqname}{seq};
244 $seq = [] if not defined $seq;
246 push @$seq, ['EXEC', $filename, $argv];
248 $pr{$pid_fqname}{seq} = $seq;
249 } elsif ($call eq 'fork' || $call eq 'clone' || $call eq 'vfork') {
250 return if $result == 0;
252 my $seq = $pr{$pid_fqname}{seq};
253 my $result_fqname= $result . "-" . $time;
254 $seq = [] if not defined $seq;
255 push @$seq, ['FORK', $result_fqname];
256 $pr{$pid_fqname}{seq} = $seq;
257 $pr{$result_fqname}{start} = $time;
258 $pr{$result_fqname}{parent} = $pid_fqname;
259 $pr{$result_fqname}{seq} = [];
260 $running_fqname{$result} = $result_fqname;
261 } elsif ($call eq '_exit' || $call eq 'exit_group') {
262 $pr{$running_fqname{$pid}}{end} = $time if defined $time and not defined $pr{$running_fqname{$pid}}{end};
263 delete $running_fqname{$pid};
268 my ($pid, $time) = @_;
269 $pr{$pid}{end} = $time if defined $time and not defined $pr{$pid}{end};
274 my $seq = $pr{$pid}{seq};
276 for my $elem (@$seq) {
277 if ($$elem[0] eq 'EXEC') {
278 my $argv = $$elem[2];
279 print "$$elem[0] $$elem[1] @$argv\n";
280 } elsif ($$elem[0] eq 'FORK') {
281 print "$$elem[0] $$elem[1]\n";
290 my $seq = $pr{$pid}{seq};
292 for my $elem (@$seq) {
293 if ($$elem[0] eq 'EXEC') {
300 sub display_pid_trace {
301 my ($pid, $lead) = @_;
303 my @seq = @{$pr{$pid}{seq}};
306 if (not defined first_exec($pid)) {
307 unshift @seq, ['EXEC', '', ['(anon)'] ];
310 if (defined $pr{$pid}{start} and defined $pr{$pid}{end}) {
311 $elapsed = $pr{$pid}{end} - $pr{$pid}{start};
312 $elapsed /= $scale_factor;
314 $elapsed = sprintf("%0.02f", $elapsed);
316 $elapsed = int $elapsed;
320 for my $elem (@seq) {
322 if ($$elem[0] eq 'EXEC') {
323 my $argv = $$elem[2];
324 if (defined $elapsed) {
325 print "$lead [$elapsed] $pid @$argv\n";
328 print "$lead $pid @$argv\n";
330 } elsif ($$elem[0] eq 'FORK') {
333 display_pid_trace($$elem[1], "$lead--+--");
335 display_pid_trace($$elem[1], "$lead +--");
337 } elsif ($i == @seq) {
338 display_pid_trace($$elem[1], "$lead `--");
340 display_pid_trace($$elem[1], "$lead +--");
354 $startpid = (keys %pr)[0];
355 while ($pr{$startpid}{parent}) {
356 $startpid = $pr{$startpid}{parent};
359 display_pid_trace($startpid, "");