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Posted to bugs@httpd.apache.org by bu...@apache.org on 2006/05/19 21:42:02 UTC
DO NOT REPLY [Bug 39618] New: - SIGALARM From Perl cgi is not being handled properly
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Summary: SIGALARM From Perl cgi is not being handled properly
Product: Apache httpd-2
Version: 2.2.2
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: worker
AssignedTo: bugs@httpd.apache.org
ReportedBy: johnha@ccbill.com
Httpd 2.2.2 is not handling Perl cgi SIGALRMs properly when used with Worker
MPM. Something very similar happened in 2.0.55, and was fixed and working again
in 2.2.0, but in 2.2.2 it's broken again. I *think* the bug is only applicable
to Worker MPM due to threading Vs. process forking. The perl CGI sends a
SIGALRM to it's parent httpd process, which should wait a specified amount of
time and send a signal back to the originating process (the cgi). I think that
signal is being sent to the wrong thread, or perhaps not being sent at all. The
following cgi code can reproduce this bug.
#!/usr/bin/perl
$ENV{PERL_SIGNALS} = 'unsafe';
use POSIX qw(SIGALRM);
my $mask = POSIX::SigSet->new(SIGALRM);
my $action = POSIX::SigAction->new(sub { die "Database connection attempt timed
out\n"; }, {flags => 0, safe => 1}, $mask);
my $oldaction = POSIX::SigAction->new();
POSIX::sigaction(SIGALRM, $action, $oldaction);
print "Content-type: text/plain\n\n";
eval{
#my $sigHandler = set_sig_handler('ALRM', sub { die "Database connection
attempt timed out\n"; }, {flags => 0, safe => 1});
alarm(3);
sleep(4);
print "Here\n";
alarm(0);
};
POSIX::sigaction(SIGALRM, $oldaction);
alarm(0);
if ($@){
print "Received error (".$@.")\n";
}
else {
print "No error\n";
}
The correct output should be "Recieved error." if the .cgi was sent a signal by
it's parent. A response of "No error" indicates that the .cgi did not recieve
it's signal callback.
Your help is greatly appreciated.
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DO NOT REPLY [Bug 39618] - SIGALARM From Perl cgi is not being handled properly
Posted by bu...@apache.org.
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------- Additional Comments From andrew@autobaun.net 2006-07-31 17:46 -------
Please fix this as soon as possible.
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DO NOT REPLY [Bug 39618] - SIGALARM From Perl cgi is not being handled properly
Posted by bu...@apache.org.
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jorton@redhat.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
------- Additional Comments From jorton@redhat.com 2008-02-11 03:41 -------
Are you using mod_cgi or mod_cgid? If the former, does it work with the latter?
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DO NOT REPLY [Bug 39618] - SIGALARM From Perl cgi is not being handled properly
Posted by bu...@apache.org.
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------- Additional Comments From jasonk@ccbill.com 2008-02-11 10:06 -------
We don't use either. However, this issue seems to have been fixed as of 2.2.3.
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DO NOT REPLY [Bug 39618] - SIGALARM From Perl cgi is not being handled properly
Posted by bu...@apache.org.
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |RESOLVED
Resolution| |FIXED
------- Additional Comments From rpluem@apache.org 2008-02-11 12:19 -------
Marked as fixed as per comment of reporter.
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