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Full Discussion: Needs help in launching a console application with the help of daemon process
Top Forums UNIX for Advanced & Expert Users Needs help in launching a console application with the help of daemon process Post 302484805 by gopallinux on Monday 3rd of January 2011 09:49:15 AM
Old 01-03-2011
Needs help in launching a console application with the help of daemon process
Hi All,

I am facing problem in launching a application with the help of a daemon process. Actually the application is based on command line that reads various commands for controlling the application from the console and accordingly executes those commands. The application always interact with console and try to read the command in while loop such as:
Code:
std::getline(std::cin, cmd); 
if(std::cin.fail()) 
{  
 //stop the reading and execution of application
}

In daemon program that launches the application as a child process, after forking and in child process, after setting sid and chdir, we close the descriptor like
Code:
close(STDOUT_FILENO);
close(STDERR_FILENO);

but does not closing the STDIN_FILENO so that the application can read the command from STDIN_FILENO. Daemon process does fork and execv the application so that application can run as a child of daemon process. On Linux, this daemon program for running the application as a child process is working fine. Daemon program runs the application successfully on Linux platform and runs as per the expectation.
But when running the daemon program from windows with the help of plink (for executing the daemon process on Linux platform from window), plink executes the daemon and the daemon process executes the application on Linux but just after 1-2 seconds, application and daemon both stop their execution and child of the application run as a daemon process. Except the child of application, rest all other process like main daemon program, application are stopping the execution. Could you please suggest me what is causing the problem and why from windows (with the help of plink) daemon process and the application is not running as expected on Linux.
Anyone with knowledge of how to get rid of these would be greatly appreciated.
Thanks
Last edited by vbe; 01-03-2011 at 01:12 PM.. Reason: code tags
 

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LEARN ABOUT CENTOS

wrapper

JavaServiceWrapper(1)                                         General Commands Manual                                        JavaServiceWrapper(1)

NAME

       wrapper - Jar daemon wrapper

USAGE

         wrapper <command> <configuration file> [configuration properties] [...]
         wrapper <configuration file> [configuration properties] [...]
            (<command> implicitly '-c')
         wrapper <command>
            (<configuration file> implicitly 'wrapper.conf')
         wrapper
            (<command> implicitly '-c' and <configuration file> 'wrapper.conf')

       where <command> can be one of:
         -c  --console run as a Console application
         -v  --version print the wrapper's version information.
         -?  --help    print this help message
         -- <args>     mark the end of Wrapper arguments.  All arguments after the
                       '--' will be passed through unmodified to the java application.

       <configuration file> is the wrapper.conf to use.  Name must be absolute or relative
         to the location of wrapper

       [configuration properties] are configuration name-value pairs which override values
         in wrapper.conf.  For example:
         wrapper.debug=true

         Please note that any file references must be absolute or relative to the location
         of the Wrapper executable.

JAVA WRAPPER SERVICE DESCRIPTION

        The Java Service Wrapper makes very easy to install a Java Application as a
        daemon process on Unix systems. The Wrapper monitors a JVM (Java Virtual
        Machine) process and automatically restarts it if it that the JVM has crashed
        or hung. This process takes just a few seconds once the Wrapper has decided
        there is a problem. It also gives the ability to handle process priority.

AUTHOR

       Java  Service  Wrapper  Community  Edition  32-bit  3.5.3  Copyright (C) 1999-2010 Tanuki Software, Ltd. All Rights Reserved.  http://wrap-
       per.tanukisoftware.com

       This manual page was written by Remi Debay <debay.remi@gmail.com>.

                                                                    10/08/2010                                               JavaServiceWrapper(1)
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