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The process ID of the current script is permanently available within the $$ variable Since this value will be different for each execution, you cannot rely on this number to store persistent information On the other hand, the process ID can be used as part of a random identification number if combined with date, time, and even a random number If you want to get the process ID of the parent process, you need to use the getppid function:
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print "The parent of $$ is ",getppid,"\n";
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This information is useful if you want to modify process groups or send the parent process a signal Under Unix, your parent process ID should be greater than 1; a parent process ID of 1 indicates that the parent has died and that you ve been adopted by the init process
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Process Groups
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A collection of processes is logically grouped into process groups For example, all the programs run within a shell belong to the same process group, providing they don t
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elect to change the process group You can obtain the process group of a process using the getpgrp function:
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print "Group of current($$): ", getpgrp(0), ", parent(",getppid,"):", getpgrp(getppid),"\n";
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If you do not specify a process, or use a process ID of 0, it returns the process group of the current process You can daemonize a process that is, make it act like a typical Unix daemon process that runs in the background without a controlling terminal by calling the setpgrp function A daemon process is one that is running in the background, and by using setpgrp, you can emulate a Unix command line like this:
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$ scriptpl &
my $childpid = fork; exit if $childpid; setpgrp(0, $$);
Because you are starting a daemon process, it s also a good idea to ensure that the new process you are creating is safe and well behaved For example, you should consider redirecting STDIN, STDOUT, and STDERR either to /dev/null or to an external log file You ll see some more examples of this later in this chapter when we look at the fork function in more detail
Process Priority
You can obtain and set the priority of a given process, process group, or user, using the getpriority and setpriority functions:
getpriority WHICH, WHO setpriority WHICH, WHO, PRIORITY
The value of WHICH should be one of PRIO_PROCESS for an individual process, PRIO_PGRP for a process group, and PRIO_USER for an individual user The WHO value should then be the corresponding process ID, process group ID, or user ID (all numerical) that you want to obtain or set the priority for The current priority will be returned by the getpriority function, and you can set it by supplying a new priority value in PRIORITY
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To do this, you need to change the process group for the current process to 0 This needs to be done after forking a new process to ensure that you are not automatically a member of an existing process group:
14:
Interprocess Communication
Note that the priorities are arbitrary values, and different values will have different meanings on different operating systems For most instances, however, the priority is in reverse order The higher the priority number, the lower the actual priority of the process All users can decrease the priority of a process (just as they can with nice), but only the superuser can increase the priority (by setting a lower value) Under Windows, the getpriority and setpriority functions don t work If you want to control the priority of a Windows process, then use the Win32::Process module to create the process This supports two methods on the newly created process object called GetPriorityClass and SetPriorityClass that allow you to control the process s priority
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