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Munin::Node::OS(3) User Contributed Perl Documentation Munin::Node::OS(3) NAME Munin::Node::OS - OS related utility methods for the Munin node. SYNOPSIS use Munin::Node::OS; my $uid = Munin::Node::OS->get_uid('foo'); my $host = Munin::Node::OS->get_fq_hostname(); METHODS get_uid $uid = $class->get_uid($user) Returns the user ID. $user might either be a user name or a user ID. Returns undef if the user doesn't exist. get_gid $gid = $class->get_gid($group) Returns the group ID. $group might either be a group name or a group ID. Returns undef if the group doesn't exist. get_fq_hostname $host = $class->get_fq_hostname() Returns the fully qualified host name of the machine. check_perms_if_paranoid $bool = $class->check_perms_if_paranoid($target); If paranoia is enabled, returns false unless $target is owned by root, and has safe permissions. If $target is a file, also checks the direc- tory it inhabits. run_as_child $result = run_as_child($timeout, $coderef, @arguments); Creates a child process to run $code and waits for up to $timeout sec- onds for it to complete. Returns a hashref containing the following keys: "stdout", "stderr" Array references containing the output of these filehandles; "retval" The result of wait(); "timed_out" True if the child had to be interrupted. System errors will cause it to carp. reap_child_group $class->reap_child_group($pid); Sends SIGHUP and SIGKILL to the process group identified by $pid. Sleeps for 2 seconds between SIGHUP and SIGKILL. possible_to_signal_process my $bool = $class->possible_to_signal_process($pid) Check whether it's possible to send a signal to $pid (that means, to be brief, that the process is owned by the same user, or we are the su- per-user). This is a useful way to check that a child process is alive (even if only as a zombie) and hasn't changed its UID. set_effective_user_id eval { $class->set_effective_user_id($uid); }; if ($@) { # Failed to set EUID } The name says it all ... set_effective_group_id See documentation for set_effective_user_id() set_real_user_id See documentation for set_effective_user_id() set_real_group_id See documentation for set_effective_user_id() set_umask Set umask so that files created by plugins are group writable Only call right before exec-ing a plugin. perl v5.42.3 2026-08-04 Munin::Node::OS(3)
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