The pid files contains the process id (a number) of a given program. For example, Apache HTTPD may write its main process number to a pid file – which is a regular text file, nothing more than that – and later use the information there contained to stop itself. You can also use that information … Read more
Sending signal 0 to a pid will raise an OSError exception if the pid is not running, and do nothing otherwise. import os def check_pid(pid): “”” Check For the existence of a unix pid. “”” try: os.kill(pid, 0) except OSError: return False else: return True
For Linux, there appears to be an interface in the kernel. Whilst researching this problem I came across people using CONFIG_CONNECTOR and CONFIG_PROC_EVENTS kernel configuration to get events on process death. Some more google and I found this: http://netsplit.com/2011/02/09/the-proc-connector-and-socket-filters/ The Proc Connector and Socket Filters Posted on February 9, 2011 by scott The proc connector … Read more
As new processes fork in, PIDs will increase to a system-dependent limit and then wrap around. The kernel will not reuse a PID before this wrap-around happens. The limit (maximum number of pids) is /proc/sys/kernel/pid_max. The manual says: /proc/sys/kernel/pid_max (since Linux 2.5.34) This file specifies the value at which PIDs wrap around (i.e., the value … Read more
Resetting the content and settings in the simulator worked for me. This is available in the “iOS Simulator” menu.
The best way is: if ps -p $PID > /dev/null then echo “$PID is running” # Do something knowing the pid exists, i.e. the process with $PID is running fi The problem with kill -0 $PID is that the exit code will be non-zero even if the process is running and you don’t have permission … Read more
Finding all of the processes You can do this through the Process class using System.Diagnostics; … var allProcesses = Process.GetProcesses(); Running Diagnostics Can you give us some more information here? It’s not clear what you want to do. The Process class provides a bit of information though that might help you out. It is possible … Read more
Advisory locking has been used for ages and it can be used in bash scripts. I prefer simple flock (from util-linux[-ng]) over lockfile (from procmail). And always remember about a trap on exit (sigspec == EXIT or 0, trapping specific signals is superfluous) in those scripts. In 2009 I released my lockable script boilerplate (originally … Read more
The four threads will have the same PID but only when viewed from above. What you (as a user) calls a PID is not what the kernel (looking from below) calls a PID. In the kernel, each thread has its own ID, called a PID, although it would possibly make more sense to call this … Read more
WMI is the easier way to do this in C#. The Win32_Process class has the ParentProcessId property. Here’s an example: using System; using System.Management; // <=== Add Reference required!! using System.Diagnostics; class Program { public static void Main() { var myId = Process.GetCurrentProcess().Id; var query = string.Format(“SELECT ParentProcessId FROM Win32_Process WHERE ProcessId = {0}”, myId); … Read more