Add procfs/allprocs

examples/procfs/allprocs/.gitignore

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+app

examples/procfs/allprocs/README.md

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+# これは何？
+
+[procfs](https://github.com/prometheus/procfs) を使って、/procファイルシステム上の全プロセス情報を取得するサンプルです。
+
+```sh
+$ task
+task: [default] rm -f ./app
+task: [default] go build -o app .
+task: [default] ./app
+[01]       1: /.supervisor/supervisor
+[02]      36: /.supervisor/supervisor
+[03]      70: /usr/bin/dash
+[04]      78: /ide/node
+[05]      90: /usr/bin/bash
+[06]     666: /ide/node
+[07]    1286: /ide/node
+[08]    1952: /ide/node
+[09]    1977: /ide/node
+[10]    2492: /ide/node
+[11]    7471: /home/gitpod/go-packages/bin/gopls
+[12]    7483: /home/gitpod/go-packages/bin/gopls
+[13]   23327: /ide/node
+[14]   42093: /home/gitpod/go-packages/bin/staticcheck
+[15]   42113: /home/gitpod/go/bin/go
+[16]   42122: /workspace/go/bin/task
+[17]   42439: /workspace/try-golang/examples/procfs/allprocs/app
+```

examples/procfs/allprocs/Taskfile.yml

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+# https://taskfile.dev
+
+version: '3'
+
+tasks:
+  default:
+    cmds:
+      - rm -f ./app
+      - go build -o app .
+      - ./app

examples/procfs/allprocs/main.go

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+package main
+
+import (
+	"log"
+
+	"github.com/prometheus/procfs"
+)
+
+func main() {
+	log.SetFlags(0)
+
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func run() error {
+	var (
+		fs  procfs.FS
+		err error
+	)
+	fs, err = procfs.NewFS(procfs.DefaultMountPoint)
+	if err != nil {
+		return err
+	}
+
+	var (
+		procs procfs.Procs // type Procs []Proc
+	)
+	procs, err = fs.AllProcs()
+	if err != nil {
+		return err
+	}
+
+	var (
+		drop = func(v string, _ error) string { return v }
+	)
+	for i, p := range procs {
+		log.Printf("[%02d] %7d: %s", i+1, p.PID, drop(p.Executable()))
+	}
+
+	return nil
+}