From a1052aea4c790463f400d30c1fc5f45650d95bbc Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alexander@sulfrian.net>
Date: Wed, 12 Feb 2014 04:02:54 +0100
Subject: get_mem: add function

---
 lib/VServer.pm | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/lib/VServer.pm b/lib/VServer.pm
index 1ef31aa..20c8cc1 100644
--- a/lib/VServer.pm
+++ b/lib/VServer.pm
@@ -1,7 +1,7 @@
 #!/usr/bin/perl -T
 
 package VServer;
-our $VERSION = '1.5';
+our $VERSION = '1.6';
 
 use strict;
 use warnings;
@@ -95,6 +95,31 @@ sub get_loadavg($) {
     return @load;
 }
 
+sub get_mem($) {
+    my $context = shift;
+    my $dir = get_proc_dir($context) || return undef;
+    my $ps = POSIX::sysconf(&POSIX::_SC_PAGESIZE) || return undef;
+    my @mem = undef;
+
+    open(my $limit, "<", "$dir/limit") || return undef;
+    while (<$limit>) {
+        if ($_ =~ m/^VM:\s*([0-9]+)\s/) {
+            $mem[0] = $1 * $ps;
+        }
+        elsif ($_ =~ m/RSS:\s*([0-9]+)\s/) {
+            $mem[1] = $1 * $ps;
+        }
+        elsif ($_ =~ m/ANON:\s*([0-9]+)\s/) {
+            $mem[2] = $1 * $ps;
+        }
+        elsif ($_ =~ m/VML:\s*([0-9]+)\s/) {
+            $mem[3] = $1 * $ps;
+        }
+    }
+    close($limit);
+
+    return @mem;
+}
 
 1;
 __END__
@@ -163,6 +188,16 @@ file inside the I</proc> directory of the vserver and parses the
 loadavg values. The function returns the three values or B<undef>
 if any error occurs.
 
+=item B<get_mem($context)>
+
+Return memory information for the vserver specified by the given
+context id. The function read the B<limit> file inside the I</proc>
+directory of the vserver, parses the memory information and
+multiplies it with the pagesize. The function returns four values
+in the following order I<virtual memory>, I<resident set size>,
+I<anonymous memory> and I<virtual locked memory> or B<undef> if
+any error occurs.
+
 =back
 
 =head1 AUTHORS
-- 
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