From 7594ba6bd763505aff077205301790ae1db8d573 Mon Sep 17 00:00:00 2001
From: Chl <chl-dev@bugness.org>
Date: Thu, 25 Apr 2024 19:14:03 +0200
Subject: [PATCH] nagios: another enhancement for check_linux_memory2

---
 nagios/check_linux_memory2.sh | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/nagios/check_linux_memory2.sh b/nagios/check_linux_memory2.sh
index f0bf4c4..5c27142 100755
--- a/nagios/check_linux_memory2.sh
+++ b/nagios/check_linux_memory2.sh
@@ -33,6 +33,7 @@ Options:
  -n		= Don't Include cached memory as free memory when calculating your percentage free
  -K		= Don't check the OutOfMemory Kill counter
  -k [0-9999]	= Threshold for OOMKill alert (default: 0)
+ -A		= Don't check awk capabilities (as of 2024: mawk can't printf an integer over 2^31)
 EOF
 	}
 
@@ -50,6 +51,7 @@ invalid_type() {
 while test -n "$1"; do
  case $1 in
   --help) print_help ; exit 0 ;;
+  -A) AWK_CHECK=0 ;;
   -h) print_help ; exit 0 ;;
   -w) WARN="$2"; shift ;;
   -c) CRIT="$2"; shift ;;
@@ -70,8 +72,18 @@ done
 [ -z "$DIV" ] && DIV=M
 [ -z "$FC" ] && FC=0
 [ -z "$DISABLE_OOMKILL" ] && DISABLE_OOMKILL=""
+[ -z "$AWK_CHECK" ] && AWK_CHECK=1
 [ -z "$THRESHOLD_OOMKILL" ] && THRESHOLD_OOMKILL=0
 
+##############################################
+## Check awk capabilities
+##############################################
+
+if [ "$AWK_CHECK" -gt 0 ] && [ "$( awk 'BEGIN{ printf "%ld", 3000000000 }' )" != "3000000000" ]; then
+	echo "UNKNOWN this version of awk is not able to display big numbers."
+	exit 3
+fi
+
 ##############################################
 ## Check user input
 ##############################################
@@ -139,7 +151,18 @@ END { if ( nc != 1 ) { free=free+cache+buff }
 		if ( oomkill > threshold_oomkill ) { result="CRITICAL - Out of memory kills detected" ; xit="2" }
 	}
 	{
-		print xit" MEMORY "result" - "freeperct"% Free - Total:"tot/divnum div" Active:"active/divnum div" Inactive:"inactive/divnum div" Buffers:"buff/divnum div" Cached:"cache/divnum div" "oomkill_display" |Active="active"B;0;0;0 Buffers="buff"B;0;0;0 Cached="cache"B;0;0;0 Free="free"B;"warn";"crit";0 Inactive="inactive"B;0;0;0"oomkill_perfdata
+		printf "%d MEMORY %s - %.2f%% Free - Total:%.1f%s", xit, result, freeperct, tot/divnum, div
+		printf " Active:%.1f%s", active/divnum, div
+		printf " Inactive:%.1f%s", inactive/divnum, div
+		printf " Buffers:%.1f%s", buff/divnum, div
+		printf " Cached:%.1f%s", cache/divnum, div
+		printf "%s", oomkill_display
+		printf " |Active=%ldB;;;0;%ld", active, tot
+		printf " Buffers=%ldB;;;0;%ld", buff, tot
+		printf " Cached=%ldB;;;0;%ld", cache, tot
+		printf " Free=%ldB;%ld;%ld;0;%ld", free, warn, crit, tot
+		printf " Inactive=%ldB;;;0;%ld", inactive, tot
+		printf "%s", oomkill_perfdata
 	}
 }' "$MEMINFO" "$OOMKILLINFO" )