Merge pull request #814 from devlights/add-unix-mkfifo-example

Author: devlights

examples/singleapp/mkfifo/create/.gitignore

@@ -0,0 +1,2 @@
+tmp-fifo
+app

examples/singleapp/mkfifo/create/Taskfile.yml

@@ -0,0 +1,20 @@
+# https://taskfile.dev
+
+version: '3'
+
+vars:
+  FIFO_FILE: ./tmp-fifo
+
+tasks:
+  default:
+    cmds:
+      - task: build
+      - task: run
+  build:
+    cmds:
+      - go build -o app .
+  run:
+    cmds:
+      - rm -f {{.FIFO_FILE}}
+      - ./app -fname {{.FIFO_FILE}}
+      - ls -l {{.FIFO_FILE}}

examples/singleapp/mkfifo/create/main.go

@@ -0,0 +1,53 @@
+//go:build linux
+
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+var (
+	fname string
+)
+
+func init() {
+	log.SetFlags(0)
+
+	flag.StringVar(&fname, "fname", "", "fifo file name")
+	flag.Parse()
+}
+
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func run() (err error) {
+	//
+	// 名前付きパイプを作成
+	//   mkfifoコマンドを実行したのと同じ意味となる
+	//
+	//   $ mkfifo fname -m0666
+	//
+	// [REFERENCES]
+	//   - https://tldp.org/LDP/lpg/node15.html
+	//   - https://linuxcommand.net/mkfifo/
+	//
+	err = unix.Mkfifo(fname, 0666)
+	if err != nil {
+		return err
+	}
+
+	if fi, err := os.Stat(fname); err == nil {
+		if fi.Mode()&os.ModeNamedPipe != 0 {
+			log.Println("Named Pipe was created.")
+		}
+	}
+
+	return nil
+}