perl function setpgrp

The setpgrp function in Perl is used to set the process group ID of the current process. Here's an example of using setpgrp in a script:

# get the current process ID and group ID
my $pid = $$;
my $pgid = getpgrp($pid);

print "Process ID: $pid\n";
print "Process group ID: $pgid\n";

# create a new process group
setpgrp();

# get the new process group ID
$pgid = getpgrp($pid);

print "New process group ID: $pgid\n";

In this example, the $$ variable is used to get the current process ID, and the getpgrp function is used to get the current process group ID. These values are printed using print statements.

The setpgrp function is then called to create a new process group for the current process. After calling setpgrp, the getpgrp function is called again to get the new process group ID, which is printed using another print statement.

Note that the setpgrp function can only be called by the process itself or by a privileged process such as root. If you try to call setpgrp from an unprivileged process, you may get an error.