03-13-2005
Debug output should go to stderr, not stdout.
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---------- Post updated at 11:52 PM ---------- Previous update was at 11:43 PM ----------
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LEARN ABOUT REDHAT
lwp::debug
LWP::Debug(3) User Contributed Perl Documentation LWP::Debug(3)
NAME
LWP::Debug - debug routines for the libwww-perl library
SYNOPSIS
use LWP::Debug qw(+ -conns);
# Used internally in the library
LWP::Debug::trace('send()');
LWP::Debug::debug('url ok');
LWP::Debug::conns("read $n bytes: $data");
DESCRIPTION
LWP::Debug provides tracing facilities. The trace(), debug() and conns() function are called within the library and they log information at
increasing levels of detail. Which level of detail is actually printed is controlled with the "level()" function.
The following functions are available:
level(...)
The "level()" function controls the level of detail being logged. Passing '+' or '-' indicates full and no logging respectively. Inidi-
vidual levels can switched on and of by passing the name of the level with a '+' or '-' prepended. The levels are:
trace : trace function calls
debug : print debug messages
conns : show all data transfered over the connections
The LWP::Debug module provide a special import() method that allows you to pass the level() arguments with initial use statement. If a
use argument start with '+' or '-' then it is passed to the level function, else the name is exported as usual. The following two
statements are thus equivalent (if you ignore that the second pollutes your namespace):
use LWP::Debug qw(+);
use LWP::Debug qw(level); level('+');
trace($msg)
The "trace()" function is used for tracing function calls. The package and calling subroutine name is printed along with the passed
argument. This should be called at the start of every major function.
debug($msg)
The "debug()" function is used for high-granularity reporting of state in functions.
conns($msg)
The "conns()" function is used to show data being transferred over the connections. This may generate considerable output.
libwww-perl-5.65 1997-12-02 LWP::Debug(3)