Munin::Node::OS

Section: User Contributed Perl Documentation (3)
Updated: 2021-02-05
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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 directory 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 seconds 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 super-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.