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Top Forums Programming the parent receive SIGTERM from its child (httpd) ? Post 302222568 by aaronwong on Thursday 7th of August 2008 03:37:19 AM
Old 08-07-2008
Question the parent receive SIGTERM from its child (httpd) ?

the parent is a process manager in our design, and httpd service is one of its child processes, which is started in foreground mode (with "-D FOREGROUND" options) according to our requirements.

when httpd service is started, one main httpd process and eight sub httpd processes can be found by "ps -ef | grep httpd". (the eight sub httpd processes are child processes of this main httpd process)

The problem is that:
-> if use "kill pid_of_httpd" to kill the main httpd process, its parent(the process manager) receives SIGTERM from it, but not SIGCHLD, which is unexpected.
-> if use "kill -9 pid_of_httpd" to kill the main httpd process, its parent receives SIGCHLD from it, which is expected.

Can anybody tell me why? Or is there any method to make httpd send SIGCHLD but not SIGTERM to its parent when killed by "kill pid_of_httpd"?

Thanks in advance !
 

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HTTPD(8)							       httpd								  HTTPD(8)

NAME
httpd - Apache Hypertext Transfer Protocol Server SYNOPSIS
httpd [ -d serverroot ] [ -f config ] [ -C directive ] [ -c directive ] [ -D parameter ] [ -e level ] [ -E file ] [ -k start|restart|grace- ful|stop|graceful-stop ] [ -h ] [ -l ] [ -L ] [ -S ] [ -t ] [ -v ] [ -V ] [ -X ] [ -M ] [ -T ] On Windows systems, the following additional arguments are available: httpd [ -k install|config|uninstall ] [ -n name ] [ -w ] SUMMARY
httpd is the Apache HyperText Transfer Protocol (HTTP) server program. It is designed to be run as a standalone daemon process. When used like this it will create a pool of child processes or threads to handle requests. In general, httpd should not be invoked directly, but rather should be invoked via apachectl on Unix-based systems or as a service on Win- dows NT, 2000 and XP and as a console application on Windows 9x and ME. OPTIONS
-d serverroot Set the initial value for the ServerRoot directive to serverroot. This can be overridden by the ServerRoot directive in the configu- ration file. The default is /usr. -f config Uses the directives in the file config on startup. If config does not begin with a /, then it is taken to be a path relative to the ServerRoot. The default is /etc/apache2/httpd.conf. -k start|restart|graceful|stop|graceful-stop Signals httpd to start, restart, or stop. See Stopping Apache httpd for more information. -C directive Process the configuration directive before reading config files. -c directive Process the configuration directive after reading config files. -D parameter Sets a configuration parameter which can be used with <IfDefine> sections in the configuration files to conditionally skip or process commands at server startup and restart. Also can be used to set certain less-common startup parameters including -DNO_DETACH (prevent the parent from forking) and -DFOREGROUND (prevent the parent from calling setsid() et al). -e level Sets the LogLevel to level during server startup. This is useful for temporarily increasing the verbosity of the error messages to find problems during startup. -E file Send error messages during server startup to file. -h Output a short summary of available command line options. -l Output a list of modules compiled into the server. This will not list dynamically loaded modules included using the LoadModule directive. -L Output a list of directives provided by static modules, together with expected arguments and places where the directive is valid. Directives provided by shared modules are not listed. -M Dump a list of loaded Static and Shared Modules. -S Show the settings as parsed from the config file (currently only shows the virtualhost settings). -T (Available in 2.3.8 and later) Skip document root check at startup/restart. -t Run syntax tests for configuration files only. The program immediately exits after these syntax parsing tests with either a return code of 0 (Syntax OK) or return code not equal to 0 (Syntax Error). If -D DUMP_VHOSTS is also set, details of the virtual host con- figuration will be printed. If -D DUMP_MODULES is set, all loaded modules will be printed. -v Print the version of httpd, and then exit. -V Print the version and build parameters of httpd, and then exit. -X Run httpd in debug mode. Only one worker will be started and the server will not detach from the console. The following arguments are available only on the Windows platform: -k install|config|uninstall Install Apache httpd as a Windows NT service; change startup options for the Apache httpd service; and uninstall the Apache httpd service. -n name The name of the Apache httpd service to signal. -w Keep the console window open on error so that the error message can be read. Apache HTTP Server 2018-07-06 HTTPD(8)
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