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Posted to modperl@perl.apache.org by Marc Tardif <ma...@sitepak.com> on 2005/07/06 22:08:33 UTC
Failure calling BOOT: code
This is the software installed on my system:
Red Hat Enterprise Linux ES release 4
httpd-2.0.54
mod_perl-2.0.1
This is the configuration in my httpd.conf file:
LoadModule perl_module modules/mod_perl.so
PerlRequire /usr/my/dev/lib/My/bootstrapper.pl
SetHandler modperl
PerlResponseHandler My::Handler
This is the content of /usr/my/dev/lib/My/bootstrapper.pl:
use lib '/usr/my/dev/lib';
open(STDERR, ">>/tmp/mod_perl.error.log") || die $!;
This is the content of /usr/my/dev/lib/My/Handler.pm:
package My::Handler;
use Apache2::RequestRec ();
use Apache2::RequestIO ();
use Apache2::Const -compile => qw(OK);
sub handler {
my $r = shift;
$r->print("hello_world");
# require Mozilla::LDAP::API;
return Apache2::Const::OK;
}
The problem is that if I uncomment the require line in the handler, I
get the following error message in /tmp/mod_perl.error.log:
Error loading Mozilla::LDAP::API: perldap_init failed
The solution might be related to the following XS code in API.xs:
BOOT:
if ( perldap_init() != 0) {
fprintf(stderr,
"Error loading Mozilla::LDAP::API: perldap_init failed\n");
exit(1);
}
So, perhaps perldap_init() is being called multiple times. Is there
something I can try in mod_perl to avoid this kind of problem? Can I
provide more information to help solve this problem?
--
Marc Tardif
Sitepak
(514) 866-8883
Re: Failure calling BOOT: code
Posted by Stas Bekman <st...@stason.org>.
Marc Tardif wrote:
[...]
> The Mozilla::LDAP::API module was installed from an RPM. I have the
> source but the makefiles don't work out of the box. I have tried
> fiddling around with the compilation flags but haven't managed to get
> the module compiled again. I would prefer to attach to the process with
> gdb but the problem is that it that the process dies when encountering a
> problem with the Perl module (see exit(1) in the XS code above).
So you need to set a breakpoint in that code, which is quite tricky, since
it won't see the breakpoint before the perl module is loaded. So you
need to break at BOOT before perldap_init(). e.g. take a look at:
http://perl.apache.org/docs/2.0/devel/debug/c.html#Precooked_gdb_Startup_Scripts
There is no exact script to copy from but you get an idea on how things
can be automated.
I've tried building Mozilla::LDAP::API, but I couldn't build it since I
think I don't have mozilla-dev package. Your best bet is to figure out how
to build it. since in order to debug it with gdb you will still need to
build it with debugging info enabled.
>> If it was a problem at the startup and if perldap uses some static C
>> variables, you could have used
>> http://perl.apache.org/docs/2.0/user/handlers/server.html#Dealing_with_Restarts
>
> I have tried printing the restart_count value in my handler and it
> always returns 2. Could that be the problem?
On the start STDERR goes to the console, so the value 1 goes there. Only
on restart it goes to the file that's where you see 2.
But since the problem happens post startup, it's probably not relevant.
>> Are you using threads?
>
> No, I'm not using threads. How can I make sure mod_perl.so hasn't been
> compiled with threads?
You use perl 5.6.1, so there can be no threads :)
--
__________________________________________________________________
Stas Bekman JAm_pH ------> Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide ---> http://perl.apache.org
mailto:stas@stason.org http://use.perl.org http://apacheweek.com
http://modperlbook.org http://apache.org http://ticketmaster.com
Re: Failure calling BOOT: code
Posted by Marc Tardif <ma...@sitepak.com>.
Stas Bekman wrote:
> Marc Tardif wrote:
> [...]
>
>> The problem is that if I uncomment the require line in the handler, I
>> get the following error message in /tmp/mod_perl.error.log:
>>
>> Error loading Mozilla::LDAP::API: perldap_init failed
>>
>> The solution might be related to the following XS code in API.xs:
>>
>> BOOT:
>> if ( perldap_init() != 0) {
>> fprintf(stderr,
>> "Error loading Mozilla::LDAP::API: perldap_init failed\n");
>> exit(1);
>> }
>>
>> So, perhaps perldap_init() is being called multiple times. Is there
>> something I can try in mod_perl to avoid this kind of problem? Can I
>> provide more information to help solve this problem?
>
>
> I'd try to add some debug prints in perldap_init() function and see
> where it fails (or step through with debugger).
The Mozilla::LDAP::API module was installed from an RPM. I have the
source but the makefiles don't work out of the box. I have tried
fiddling around with the compilation flags but haven't managed to get
the module compiled again. I would prefer to attach to the process with
gdb but the problem is that it that the process dies when encountering a
problem with the Perl module (see exit(1) in the XS code above).
> If it was a problem at the startup and if perldap uses some static C
> variables, you could have used
> http://perl.apache.org/docs/2.0/user/handlers/server.html#Dealing_with_Restarts
I have tried printing the restart_count value in my handler and it
always returns 2. Could that be the problem?
> However it looks like a runtime problem.
>
> What if you preload Mozilla::LDAP::API at the server startup?
Same thing, I still get the error message:
Error loading Mozilla::LDAP::API: perldap_init failed
> Are you using threads?
No, I'm not using threads. How can I make sure mod_perl.so hasn't been
compiled with threads?
> Can you please send the complete bug report as
> explained at http://perl.apache.org/bugs/?
Done.
--
Marc Tardif
Sitepak
(514) 866-8883
Re: Failure calling BOOT: code
Posted by Stas Bekman <st...@stason.org>.
Marc Tardif wrote:
[...]
> The problem is that if I uncomment the require line in the handler, I
> get the following error message in /tmp/mod_perl.error.log:
>
> Error loading Mozilla::LDAP::API: perldap_init failed
>
> The solution might be related to the following XS code in API.xs:
>
> BOOT:
> if ( perldap_init() != 0) {
> fprintf(stderr,
> "Error loading Mozilla::LDAP::API: perldap_init failed\n");
> exit(1);
> }
>
> So, perhaps perldap_init() is being called multiple times. Is there
> something I can try in mod_perl to avoid this kind of problem? Can I
> provide more information to help solve this problem?
I'd try to add some debug prints in perldap_init() function and see where
it fails (or step through with debugger).
If it was a problem at the startup and if perldap uses some static C
variables, you could have used
http://perl.apache.org/docs/2.0/user/handlers/server.html#Dealing_with_Restarts
However it looks like a runtime problem.
What if you preload Mozilla::LDAP::API at the server startup?
Are you using threads? Can you please send the complete bug report as
explained at http://perl.apache.org/bugs/?
--
__________________________________________________________________
Stas Bekman JAm_pH ------> Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide ---> http://perl.apache.org
mailto:stas@stason.org http://use.perl.org http://apacheweek.com
http://modperlbook.org http://apache.org http://ticketmaster.com