Debug(3) User Contributed Perl Documentation Debug(3)NAMECoro::Debug - various functions that help debugging Coro programs
SYNOPSIS
use Coro::Debug;
our $server = new_unix_server Coro::Debug "/tmp/socketpath";
$ socat readline unix:/tmp/socketpath
DESCRIPTION
This module is an AnyEvent user, you need to make sure that you use and
run a supported event loop.
This module provides some debugging facilities. Most will, if not
handled carefully, severely compromise the security of your program, so
use it only for debugging (or take other precautions).
It mainly implements a very primitive debugger that is evry easy to
integrate in your program:
our $server = new_unix_server Coro::Debug "/tmp/somepath";
# see new_unix_server, below, for more info
It lets you list running coroutines:
state (rUnning, Ready, New or neither)
|cctx allocated
|| resident set size (octets)
|| | scheduled this many times
> ps || | |
PID SC RSS USES Description Where
14572344 UC 62k 128k [main::] [dm-support.ext:47]
14620056 -- 2260 13 [coro manager] [Coro.pm:358]
14620128 -- 2260 166 [unblock_sub scheduler] [Coro.pm:358]
17764008 N- 152 0 [EV idle process] -
13990784 -- 2596 10k timeslot manager [cf.pm:454]
81424176 -- 18k 4758 [async pool idle] [Coro.pm:257]
23513336 -- 2624 1 follow handler [follow.ext:52]
40548312 -- 15k 5597 player scheduler [player-scheduler.ext:13]
29138032 -- 2548 431 music scheduler [player-env.ext:77]
43449808 -- 2260 3493 worldmap updater [item-worldmap.ext:115]
33352488 -- 19k 2845 [async pool idle] [Coro.pm:257]
81530072 -- 13k 43k map scheduler [map-scheduler.ext:65]
30751144 -- 15k 2204 [async pool idle] [Coro.pm:257]
Lets you do backtraces on about any coroutine:
> bt 18334288
coroutine is at /opt/cf/ext/player-env.ext line 77
eval {...} called at /opt/cf/ext/player-env.ext line 77
ext::player_env::__ANON__ called at -e line 0
Coro::_run_coro called at -e line 0
Or lets you eval perl code:
> 5+7
12
Or lets you eval perl code within other coroutines:
> eval 18334288 caller(1); $DB::args[0]->method
1
It can also trace subroutine entry/exits for most coroutines (those not
having recursed into a C function), resulting in output similar to:
> loglevel 5
> trace 94652688
2007-09-27Z20:30:25.1368 (5) [94652688] enter Socket::sockaddr_in with (8481,\x{7f}\x{00}\x{00}\x{01})
2007-09-27Z20:30:25.1369 (5) [94652688] leave Socket::sockaddr_in returning (\x{02}\x{00}...)
2007-09-27Z20:30:25.1370 (5) [94652688] enter Net::FCP::Util::touc with (client_get)
2007-09-27Z20:30:25.1371 (5) [94652688] leave Net::FCP::Util::touc returning (ClientGet)
2007-09-27Z20:30:25.1372 (5) [94652688] enter AnyEvent::Impl::Event::io with (AnyEvent,fh,GLOB(0x9256250),poll,w,cb,CODE(0x8c963a0))
2007-09-27Z20:30:25.1373 (5) [94652688] enter Event::Watcher::__ANON__ with (Event,poll,w,fd,GLOB(0x9256250),cb,CODE(0x8c963a0))
2007-09-27Z20:30:25.1374 (5) [94652688] enter Event::io::new with (Event::io,poll,w,fd,GLOB(0x9256250),cb,CODE(0x8c963a0))
2007-09-27Z20:30:25.1375 (5) [94652688] enter Event::Watcher::init with (Event::io=HASH(0x8bfb120),HASH(0x9b7940))
If your program uses the Coro::Debug::log facility:
Coro::Debug::log 0, "important message";
Coro::Debug::log 9, "unimportant message";
Then you can even receive log messages in any debugging session:
> loglevel 5
2007-09-26Z02:22:46 (9) unimportant message
Other commands are available in the shell, use the "help" command for a
list.
FUNCTIONS
None of the functions are being exported.
log $level, $msg
Log a debug message of the given severity level (0 is highest,
higher is less important) to all interested parties.
stderr_loglevel $level
Set the loglevel for logging to stderr (defaults to the value of
the environment variable PERL_CORO_STDERR_LOGLEVEL, or -1 if
missing).
session_loglevel $level
Set the default loglevel for new coro debug sessions (defaults to
the value of the environment variable PERL_CORO_DEFAULT_LOGLEVEL,
or -1 if missing).
trace $coro, $loglevel
Enables tracing the given coroutine at the given loglevel. If
loglevel is omitted, use 5. If coro is omitted, trace the current
coroutine. Tracing incurs a very high runtime overhead.
It is not uncommon to enable tracing on oneself by simply calling
"Coro::Debug::trace".
A message will be logged at the given loglevel if it is not
possible to enable tracing.
untrace $coro
Disables tracing on the given coroutine.
command $string
Execute a debugger command, sending any output to STDOUT. Used by
"session", below.
session $fh
Run an interactive debugger session on the given filehandle. Each
line entered is simply passed to "command".
$server = new_unix_server Coro::Debug $path
Creates a new unix domain socket that listens for connection
requests and runs "session" on any connection. Normal unix
permission checks and umask applies, so you can protect your socket
by puttint it into a protected directory.
The "socat" utility is an excellent way to connect to this socket:
socat readline /path/to/socket
Socat also offers history support:
socat readline:history=/tmp/hist.corodebug /path/to/socket
The server accepts connections until it is destroyed, so you must
keep the return value around as long as you want the server to stay
available.
$server = new_tcp_server Coro::Debug $port
Similar to "new_unix_server", but binds on a TCP port. Note that
this is usually results in a gaping security hole.
Currently, only a TCPv4 socket is created, in the future, a TCPv6
socket might also be created.
AUTHOR
Marc Lehmann <schmorp@schmorp.de>
http://home.schmorp.de/
perl v5.14.2 2011-11-11 Debug(3)
