1Debug(3) User Contributed Perl Documentation Debug(3)
2
6 Coro::Debug - various functions that help debugging Coro programs
7
9 use Coro::Debug;
10 our $server = new_unix_server Coro::Debug "/tmp/socketpath";
12 $ socat readline unix:/tmp/socketpath
14
16 This module is an AnyEvent user, you need to make sure that you use and
17 run a supported event loop.
18 This module provides some debugging facilities. Most will, if not
20 handled carefully, severely compromise the security of your program, so
21 use it only for debugging (or take other precautions).
22 It mainly implements a very primitive debugger that is very easy to
24 integrate in your program:
25 our $server = new_unix_server Coro::Debug "/tmp/somepath";
27 # see new_unix_server, below, for more info
28 It lets you list running coroutines:
30 state (rUnning, Ready, New or neither)
32 |cctx allocated
33 || resident set size (octets)
34 || | scheduled this many times
35 > ps || | |
36 PID SC RSS USES Description Where
37 14572344 UC 62k 128k [main::] [dm-support.ext:47]
38 14620056 -- 2260 13 [coro manager] [Coro.pm:358]
39 14620128 -- 2260 166 [unblock_sub scheduler] [Coro.pm:358]
40 17764008 N- 152 0 [EV idle process] -
41 13990784 -- 2596 10k timeslot manager [cf.pm:454]
42 81424176 -- 18k 4758 [async pool idle] [Coro.pm:257]
43 23513336 -- 2624 1 follow handler [follow.ext:52]
44 40548312 -- 15k 5597 player scheduler [player-scheduler.ext:13]
45 29138032 -- 2548 431 music scheduler [player-env.ext:77]
46 43449808 -- 2260 3493 worldmap updater [item-worldmap.ext:115]
47 33352488 -- 19k 2845 [async pool idle] [Coro.pm:257]
48 81530072 -- 13k 43k map scheduler [map-scheduler.ext:65]
49 30751144 -- 15k 2204 [async pool idle] [Coro.pm:257]
50 Lets you do backtraces on about any coroutine:
52 > bt 18334288
54 coroutine is at /opt/cf/ext/player-env.ext line 77
55 eval {...} called at /opt/cf/ext/player-env.ext line 77
56 ext::player_env::__ANON__ called at -e line 0
57 Coro::_run_coro called at -e line 0
58 Or lets you eval perl code:
60 > 5+7
62 12
63 Or lets you eval perl code within other coroutines:
65 > eval 18334288 caller(1); $DB::args[0]->method
67 1
68 It can also trace subroutine entry/exits for most coroutines (those not
70 having recursed into a C function), resulting in output similar to:
71 > loglevel 5
73 > trace 94652688
74 2007-09-27Z20:30:25.1368 (5) [94652688] enter Socket::sockaddr_in with (8481,\x{7f}\x{00}\x{00}\x{01})
75 2007-09-27Z20:30:25.1369 (5) [94652688] leave Socket::sockaddr_in returning (\x{02}\x{00}...)
76 2007-09-27Z20:30:25.1370 (5) [94652688] enter Net::FCP::Util::touc with (client_get)
77 2007-09-27Z20:30:25.1371 (5) [94652688] leave Net::FCP::Util::touc returning (ClientGet)
78 2007-09-27Z20:30:25.1372 (5) [94652688] enter AnyEvent::Impl::Event::io with (AnyEvent,fh,GLOB(0x9256250),poll,w,cb,CODE(0x8c963a0))
79 2007-09-27Z20:30:25.1373 (5) [94652688] enter Event::Watcher::__ANON__ with (Event,poll,w,fd,GLOB(0x9256250),cb,CODE(0x8c963a0))
80 2007-09-27Z20:30:25.1374 (5) [94652688] enter Event::io::new with (Event::io,poll,w,fd,GLOB(0x9256250),cb,CODE(0x8c963a0))
81 2007-09-27Z20:30:25.1375 (5) [94652688] enter Event::Watcher::init with (Event::io=HASH(0x8bfb120),HASH(0x9b7940))
82 If your program uses the Coro::Debug::log facility:
84 Coro::Debug::log 0, "important message";
86 Coro::Debug::log 9, "unimportant message";
87 Then you can even receive log messages in any debugging session:
89 > loglevel 5
91 2007-09-26Z02:22:46 (9) unimportant message
92 Other commands are available in the shell, use the "help" command for a
94 list.
95
97 None of the functions are being exported.
98 log $level, $msg
100 Log a debug message of the given severity level (0 is highest,
101 higher is less important) to all interested parties.
102 stderr_loglevel $level
104 Set the loglevel for logging to stderr (defaults to the value of
105 the environment variable PERL_CORO_STDERR_LOGLEVEL, or -1 if
106 missing).
107 session_loglevel $level
109 Set the default loglevel for new coro debug sessions (defaults to
110 the value of the environment variable PERL_CORO_DEFAULT_LOGLEVEL,
111 or -1 if missing).
112 trace $coro, $loglevel
114 Enables tracing the given coroutine at the given loglevel. If
115 loglevel is omitted, use 5. If coro is omitted, trace the current
116 coroutine. Tracing incurs a very high runtime overhead.
117 It is not uncommon to enable tracing on oneself by simply calling
119 "Coro::Debug::trace".
120 A message will be logged at the given loglevel if it is not
122 possible to enable tracing.
123 untrace $coro
125 Disables tracing on the given coroutine.
126 command $string
128 Execute a debugger command, sending any output to STDOUT. Used by
129 "session", below.
130 session $fh
132 Run an interactive debugger session on the given filehandle. Each
133 line entered is simply passed to "command" (with a few exceptions).
134 $server = new_unix_server Coro::Debug $path
136 Creates a new unix domain socket that listens for connection
137 requests and runs "session" on any connection. Normal unix
138 permission checks and umask applies, so you can protect your socket
139 by puttint it into a protected directory.
140 The "socat" utility is an excellent way to connect to this socket:
142 socat readline /path/to/socket
144 Socat also offers history support:
146 socat readline:history=/tmp/hist.corodebug /path/to/socket
148 The server accepts connections until it is destroyed, so you must
150 keep the return value around as long as you want the server to stay
151 available.
152 $server = new_tcp_server Coro::Debug $port
154 Similar to "new_unix_server", but binds on a TCP port. Note that
155 this is usually results in a gaping security hole.
156 Currently, only a TCPv4 socket is created, in the future, a TCPv6
158 socket might also be created.
159
161 Marc A. Lehmann <schmorp@schmorp.de>
162 http://software.schmorp.de/pkg/Coro.html
163perl v5.32.0 2020-08-03 Debug(3)