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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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Tk_SetAppName(3tk)					       Tk Library Procedures						Tk_SetAppName(3tk)

__________________________________________________________________________________________________________________________________________________

NAME
Tk_SetAppName - Set the name of an application for 'send' commands SYNOPSIS
#include <tk.h> const char * Tk_SetAppName(tkwin, name) ARGUMENTS
Tk_Window tkwin (in) Token for window in application. Used only to select a particular application. const char *name (in) Name under which to register the application. _________________________________________________________________ DESCRIPTION
Tk_SetAppName associates a name with a given application and records that association on the display containing with the application's main window. After this procedure has been invoked, other applications on the display will be able to use the send command to invoke operations in the application. If name is already in use by some other application on the display, then a new name will be generated by appending " #2" to name; if this name is also in use, the number will be incremented until an unused name is found. The return value from the proce- dure is a pointer to the name actually used. If the application already has a name when Tk_SetAppName is called, then the new name replaces the old name. Tk_SetAppName also adds a send command to the application's interpreter, which can be used to send commands from this application to others on any of the displays where the application has windows. The application's name registration persists until the interpreter is deleted or the send command is deleted from interp, at which point the name is automatically unregistered and the application becomes inaccessible via send. The application can be made accessible again by calling Tk_SetAppName. Tk_SetAppName is called automatically by Tk_Init, so applications do not normally need to call it explicitly. The command tk appname provides Tcl-level access to the functionality of Tk_SetAppName. KEYWORDS
application, name, register, send command Tk 4.0 Tk_SetAppName(3tk)

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