How a process can check if a particular process is running on different machine?


 
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Old 06-02-2012
How a process can check if a particular process is running on different machine?

I have process1 running on one machine and generating some log file. Now another process which can be launched on any machine wants to know if process1 is running or not and also in case it is running it wants to stream the logs file generated by process1 on terminal from which process2 is launched.

Process2 will be invoked as follows: process2 -dir "DirPath". In this DirPath process1 has written a file which has information like "pid of process1", "hostname of process 1" and "log file of process1". So process2 can access this file and has all the information about process1. Now process2 wants to know if process1 is currently running or not and if it is running then it needs to stream data written by process1 in logfile to the terminal from which process2 is launched.
 
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WIN32_START_SERVICE_CTRL_DISPATCHER(3)					 1				    WIN32_START_SERVICE_CTRL_DISPATCHER(3)

win32_start_service_ctrl_dispatcher - Registers the script with the SCM, so that it can act as the service with the given name

SYNOPSIS
mixed win32_start_service_ctrl_dispatcher (string $name) DESCRIPTION
When launched via the Service Control Manager, a service process is required to "check-in" with it to establish service monitoring and communication facilities. This function performs the check-in by spawning a thread to handle the lower-level communication with the service control manager. Once started, the service process should do 2 things. The first is to tell the Service Control Manager that the service is running. This is achieved by calling win32_set_service_status(3) with the WIN32_SERVICE_RUNNING constant. If you need to perform some lengthy process before the service is actually running, then you can use the WIN32_SERVICE_START_PENDING constant. The second is to continue to check-in with the service control manager so that it can determine if it should terminate. This is achieved by periodically calling win32_get_last_control_message(3) and handling the return code appropriately. PARAMETERS
o $name - The short-name of the service, as registered by win32_create_service(3). RETURN VALUES
Returns TRUE on success, FALSE if there is a problem with the parameters or a Win32 Error Code on failure. EXAMPLES
Example #1 A win32_start_service_ctrl_dispatcher(3) example Check if the service is runnig under the SCM. <?php if (!win32_start_service_ctrl_dispatcher('dummyphp')) { die("I'm probably not running under the service control manager"); } win32_set_service_status(WIN32_SERVICE_START_PENDING); // Some lengthy process to get this service up and running. win32_set_service_status(WIN32_SERVICE_RUNNING); while (WIN32_SERVICE_CONTROL_STOP != win32_get_last_control_message()) { # do some work here, trying not to take more than around 30 seconds # before coming back into the loop again } ?> SEE ALSO
win32_set_service_status(3), win32_get_last_control_message(3), Win32 Error Codes. PHP Documentation Group WIN32_START_SERVICE_CTRL_DISPATCHER(3)