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 $scale_factor = 3.5;
46 my ($pid, $call, $args, $result, $time, $time_spent);
53 if (s/^(\d\d):(\d\d):(\d\d)(?:\.(\d\d\d\d\d\d))? //) {
54 $time = $1 * 3600 + $2 * 60 + $3;
56 $time = $time + $4 / 1000000;
59 } elsif (s/^(\d+)\.(\d\d\d\d\d\d) //) {
60 $time = $1 + ($2 / 1000000);
64 if (s/ <unfinished ...>$//) {
65 $unfinished{$pid} = $_;
69 if (s/^<... \S+ resumed> //) {
70 unless (exists $unfinished{$pid}) {
71 print STDERR "$0: $ARGV: cannot find start of resumed call on line $.";
74 $_ = $unfinished{$pid} . $_;
75 delete $unfinished{$pid};
78 if (/^--- SIG(\S+) (.*) ---$/) {
79 # $pid received signal $1
80 # currently we don't do anything with this
84 if (/^\+\+\+ killed by SIG(\S+) \+\+\+$/) {
85 # $pid received signal $1
86 handle_killed($pid, $time);
90 if (/^\+\+\+ exited with (\d+) \+\+\+$/) {
92 # currently we don't do anything with this
96 ($call, $args, $result) = /(\S+)\((.*)\)\s+= (.*)$/;
97 if ($result =~ /^(.*) <([0-9.]*)>$/) {
98 ($result, $time_spent) = ($1, $2);
100 unless (defined $result) {
101 print STDERR "$0: $ARGV: $.: cannot parse line.\n";
105 handle_trace($pid, $call, $args, $result, $time);
117 if ($in =~ s/^\\(.)//) {
119 } elsif ($in =~ s/^\"//) {
120 if ($in =~ s/^\.\.\.//) {
121 return ("$result...", $in);
123 return ($result, $in);
124 } elsif ($in =~ s/([^\\\"]*)//) {
135 if ($in =~ s/^\"//) {
137 ($tmp, $in) = parse_str($in);
138 if (not defined $tmp) {
139 print STDERR "$0: $ARGV: $.: cannot parse string.\n";
143 } elsif ($in =~ s/^0x([[:xdigit:]]+)//) {
144 return (hex $1, $in);
145 } elsif ($in =~ s/^(\d+)//) {
146 return (int $1, $in);
148 print STDERR "$0: $ARGV: $.: unrecognized element.\n";
159 if ($in =~ s/^\[//) {
161 if ($in =~ s,^/\* (\d+) vars \*/\],,) {
164 while ($in !~ s/^\]//) {
165 ($tmp, $in) = parse_one($in);
166 defined $tmp or return undef;
168 unless ($in =~ /^\]/ or $in =~ s/^, //) {
169 print STDERR "$0: $ARGV: $.: missing comma in array.\n";
172 if ($in =~ s/^\.\.\.//) {
176 push @args, \@subarr;
178 } elsif ($in =~ s/^\{//) {
180 while ($in !~ s/^\}//) {
182 unless ($in =~ s/^(\w+)=//) {
183 print STDERR "$0: $ARGV: $.: struct field expected.\n";
187 ($tmp, $in) = parse_one($in);
188 defined $tmp or return undef;
189 $subhash{$key} = $tmp;
190 unless ($in =~ s/, //) {
191 print STDERR "$0: $ARGV: $.: missing comma in struct.\n";
195 push @args, \%subhash;
197 ($tmp, $in) = parse_one($in);
198 defined $tmp or return undef;
201 unless (length($in) == 0 or $in =~ s/^, //) {
202 print STDERR "$0: $ARGV: $.: missing comma.\n";
212 # process info, indexed by pid.
215 # seq clones, forks and execs for this pid, in sequence (array)
217 # filename and argv (from latest exec)
218 # basename (derived from filename)
219 # argv[0] is modified to add the basename if it differs from the 0th argument.
224 my ($pid, $call, $args, $result, $time) = @_;
227 if (defined $time and not defined $pr{$pid}{start}) {
228 $pr{$pid}{start} = $time;
231 if ($call eq 'execve') {
232 return if $result ne '0';
234 my ($filename, $argv) = parseargs($args);
235 my ($basename) = $filename =~ m/([^\/]*)$/;
236 if ($basename ne $$argv[0]) {
237 $$argv[0] = "$basename($$argv[0])";
239 my $seq = $pr{$pid}{seq};
240 $seq = [] if not defined $seq;
242 push @$seq, ['EXEC', $filename, $argv];
244 $pr{$pid}{seq} = $seq;
245 } elsif ($call eq 'fork' || $call eq 'clone' || $call eq 'vfork') {
246 return if $result == 0;
248 my $seq = $pr{$pid}{seq};
249 $seq = [] if not defined $seq;
250 push @$seq, ['FORK', $result];
251 $pr{$pid}{seq} = $seq;
252 $pr{$result}{parent} = $pid;
253 $pr{$result}{seq} = [];
254 } elsif ($call eq '_exit' || $call eq 'exit_group') {
255 $pr{$pid}{end} = $time if defined $time;
260 my ($pid, $time) = @_;
261 $pr{$pid}{end} = $time if defined $time;
266 my $seq = $pr{$pid}{seq};
268 for my $elem (@$seq) {
269 if ($$elem[0] eq 'EXEC') {
270 my $argv = $$elem[2];
271 print "$$elem[0] $$elem[1] @$argv\n";
272 } elsif ($$elem[0] eq 'FORK') {
273 print "$$elem[0] $$elem[1]\n";
282 my $seq = $pr{$pid}{seq};
284 for my $elem (@$seq) {
285 if ($$elem[0] eq 'EXEC') {
292 sub display_pid_trace {
293 my ($pid, $lead) = @_;
295 my @seq = @{$pr{$pid}{seq}};
298 if (not defined first_exec($pid)) {
299 unshift @seq, ['EXEC', '', ['(anon)'] ];
302 if (defined $pr{$pid}{start} and defined $pr{$pid}{end}) {
303 $elapsed = $pr{$pid}{end} - $pr{$pid}{start};
304 $elapsed /= $scale_factor;
306 $elapsed = sprintf("%0.02f", $elapsed);
308 $elapsed = int $elapsed;
312 for my $elem (@seq) {
314 if ($$elem[0] eq 'EXEC') {
315 my $argv = $$elem[2];
316 if (defined $elapsed) {
317 print "$lead [$elapsed] $pid @$argv\n";
320 print "$lead $pid @$argv\n";
322 } elsif ($$elem[0] eq 'FORK') {
325 display_pid_trace($$elem[1], "$lead--+--");
327 display_pid_trace($$elem[1], "$lead +--");
329 } elsif ($i == @seq) {
330 display_pid_trace($$elem[1], "$lead `--");
332 display_pid_trace($$elem[1], "$lead +--");
346 $startpid = (keys %pr)[0];
347 while ($pr{$startpid}{parent}) {
348 $startpid = $pr{$startpid}{parent};
351 display_pid_trace($startpid, "");