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Full Discussion: the parent receive SIGTERM from its child (httpd) ?
Top Forums Programming the parent receive SIGTERM from its child (httpd) ? Post 302222584 by aaronwong on Thursday 7th of August 2008 04:25:51 AM
Old 08-07-2008
Yes, it is Apache httpd.
Using "-D FOREGROUND" option is to run httpd as a child process of the process manager in our system, so that it can be monitored by the process manager. If leave out this option, when the process manager fork() and exec() to start httpd, it will became an orphan(which parent process pid is 1 ).
And the process manager is running in background mode, so Ctrl-C could not terminate the process manager and httpd service.
Kill httpd by "kill" command is just to test whether the process manager can be aware of its child process - httpd exiting.

Thanks for your advice, but by "
Quote:
I'm guessing with kill -9 you are not allowing it to run its regular signal handlers, which include sending a SIGTERM to the parent
. ", it is the design of httpd, and we could hardly do nothing to change it, unless there is no other solution.
and by "
Quote:
I'm also guessing this is by design, and that you should be able to find an option which disables this behavior
.", you mean the options to start httpd ?

Thanks !
 

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LEARN ABOUT DEBIAN

devel::nytprof::apache

Devel::NYTProf::Apache(3pm)				User Contributed Perl Documentation			       Devel::NYTProf::Apache(3pm)

NAME

       Devel::NYTProf::Apache - Profile mod_perl applications with Devel::NYTProf

SYNOPSIS

	 # in your Apache config file with mod_perl installed
	 PerlPassEnv NYTPROF
	 PerlModule Devel::NYTProf::Apache

       If you're using virtual hosts with "PerlOptions" that include either "+Parent" or "+Clone" then see "VIRTUAL HOSTS" below.

DESCRIPTION

       This module allows mod_perl applications to be profiled using "Devel::NYTProf".

       If the NYTPROF environment variable isn't set at the time Devel::NYTProf::Apache is loaded then Devel::NYTProf::Apache will issue a warning
       and default it to:

	 file=/tmp/nytprof.$$.out

       The file actually created by NTProf will also have the process id appended to it because the "addpid" option is enabled by default.

       See "ENVIRONMENT VARIABLES" in Devel::NYTProf for more details on the settings effected by this environment variable.  Try using
       "PerlPassEnv" so you can set the NYTPROF environment variable externally.

       Each profiled mod_perl process will need to have terminated before you can successfully read the profile data file. The simplest approach
       is to start the httpd, make some requests (e.g., 100 of the same request), then stop it and process the profile data.

       Alternatively you could send a TERM signal to the httpd worker process to terminate that one process. The parent httpd process will start
       up another one for you ready for more profiling.

   Example httpd.conf
       It's often a good idea to use just one child process when profiling, which you can do by setting the "MaxClients" to 1 in httpd.conf.

       Using an "IfDefine" blocks lets you leave the profile configuration in place and enable it whenever it's needed by adding "-D NYTPROF" to
       the httpd startup command line.

	 <IfDefine NYTPROF>
	     MaxClients 1
	     PerlModule Devel::NYTProf::Apache
	 </IfDefine>

VIRTUAL HOSTS

       If your httpd configuration includes virtual hosts with "PerlOptions" that include either "+Parent" or "+Clone" then mod_perl2 will create
       a new perl interpreter to handle requests for that virtual host.  This causes some issues for profiling.

       If "Devel::NYTProf::Apache" is loaded in the top-level configuration then activity in any virtual hosts that use their own perl interpreter
       won't be profiled. Normal virtual hosts will be profiled just fine.

       You can profile a single virtual host that uses its own perl interpreter by loading "Devel::NYTProf::Apache" inside the configuration for
       that virtual host. In this case do not use "PerlModule" directive. You need to use a "Perl" directive instead, like this:

	   <VirtualHost *:1234>
	       ...
	       <Perl> use Devel::NYTProf::Apache; </Perl>
	       ...
	   </VirtualHost>

LIMITATIONS

       Profiling mod_perl on Windows is not supported because NYTProf currently doesn't support threads.

SEE ALSO

       Devel::NYTProf

AUTHOR

       Adam Kaplan, "<akaplan at nytimes.com>" Tim Bunce, <http://www.tim.bunce.name> and <http://blog.timbunce.org> Steve Peters, "<steve at
       fisharerojo.org>"

COPYRIGHT AND LICENSE

	 Copyright (C) 2008 by Adam Kaplan and The New York Times Company.
	 Copyright (C) 2008 by Steve Peters.
	 Copyright (C) 2008 by Tim Bunce.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.14.2							    2010-06-10					       Devel::NYTProf::Apache(3pm)
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