From 0d80f79469a7200fdf2e17bed3ab909f317b26c8 Mon Sep 17 00:00:00 2001
From: Perry Hargrave <bioe007@users.noreply.github.com>
Date: Thu, 22 Feb 2024 00:31:15 -0800
Subject: [PATCH] /proc/loadavg basics

---
 README.md    |  6 ++++
 load/load.go | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 synopsys.go  |  8 ++++++
 3 files changed, 92 insertions(+)
 create mode 100644 load/load.go

diff --git a/README.md b/README.md
index 39e03f8..498900e 100644
--- a/README.md
+++ b/README.md
@@ -48,3 +48,9 @@ These are the parameters I'd like to show
 initially this will just output some rolling format. will have to think
 about something like a tui to properly place things for readability
 though
+
+
+## References
+
+- [/proc/loadavg](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/4/html/reference_guide/s2-proc-loadavg)
+
diff --git a/load/load.go b/load/load.go
new file mode 100644
index 0000000..6a2faae
--- /dev/null
+++ b/load/load.go
@@ -0,0 +1,78 @@
+package load
+
+import (
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Load struct {
+	one          float64
+	five         float64
+	fifteen      float64
+	proc_running int
+	proc_total   int
+	lastpid      int
+}
+
+type LA_CONST int
+
+const (
+	LA_ONEMIN LA_CONST = iota
+	LA_FIVEMIN
+	LA_FIFTEENMIN
+	LA_PROC_RUN // gotta remember LA_PROC_TOTAL is
+	// LA_PROC_TOTAL // This is actually not a sepaarte entry when parsing
+	LA_LASTPID
+)
+
+func GetLoadAvg() (*Load, error) {
+	f, err := os.ReadFile("/proc/loadavg")
+	if err != nil {
+		log.Fatal(err)
+	}
+	loadinfo := new(Load)
+	sp := strings.Split(strings.TrimSuffix(string(f), "\n"), " ")
+
+	// The running/total process entries are not space-delimited so parse those
+	// a little different
+	var i LA_CONST
+	for i = LA_ONEMIN; i <= LA_LASTPID+1; i++ {
+		switch i {
+		case LA_ONEMIN:
+			loadinfo.one, err = strconv.ParseFloat(sp[i], 64)
+			if err != nil {
+				return nil, err
+			}
+		case LA_FIVEMIN:
+			loadinfo.five, err = strconv.ParseFloat(sp[i], 64)
+			if err != nil {
+				return nil, err
+			}
+		case LA_FIFTEENMIN:
+			loadinfo.fifteen, err = strconv.ParseFloat(sp[i], 64)
+			if err != nil {
+				return nil, err
+			}
+		case LA_PROC_RUN:
+			// These are not space delimited but shown like X/Y in the loadavg file
+			procs := strings.Split(sp[i], "/")
+			loadinfo.proc_running, err = strconv.Atoi(procs[0])
+			if err != nil {
+				return nil, err
+			}
+			loadinfo.proc_total, err = strconv.Atoi(procs[1])
+			if err != nil {
+				return nil, err
+			}
+		case LA_LASTPID:
+			loadinfo.lastpid, err = strconv.Atoi(sp[i])
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+	return loadinfo, nil
+
+}
diff --git a/synopsys.go b/synopsys.go
index a0be96c..73aa1a4 100644
--- a/synopsys.go
+++ b/synopsys.go
@@ -5,6 +5,7 @@ import (
 	"log"
 
 	"github.com/bioe007/synopsys/cpu"
+	"github.com/bioe007/synopsys/load"
 	"github.com/bioe007/synopsys/memory"
 )
 
@@ -17,4 +18,11 @@ func main() {
 
 	cpuinf, err := cpu.GetCPUStats()
 	fmt.Println("cpu struct ${##v}", cpuinf)
+
+	load, err := load.GetLoadAvg()
+	if err != nil {
+		log.Fatal("Load average failure", err)
+	}
+	fmt.Println("Load average stuff", load)
+
 }