Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/os/signal/example_unix_test.go b/src/os/signal/example_unix_test.go
new file mode 100644
index 0000000..b7047ac
--- /dev/null
+++ b/src/os/signal/example_unix_test.go
@@ -0,0 +1,47 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build unix
+
+package signal_test
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"time"
+)
+
+// This example passes a context with a signal to tell a blocking function that
+// it should abandon its work after a signal is received.
+func ExampleNotifyContext() {
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer stop()
+
+	p, err := os.FindProcess(os.Getpid())
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// On a Unix-like system, pressing Ctrl+C on a keyboard sends a
+	// SIGINT signal to the process of the program in execution.
+	//
+	// This example simulates that by sending a SIGINT signal to itself.
+	if err := p.Signal(os.Interrupt); err != nil {
+		log.Fatal(err)
+	}
+
+	select {
+	case <-time.After(time.Second):
+		fmt.Println("missed signal")
+	case <-ctx.Done():
+		fmt.Println(ctx.Err()) // prints "context canceled"
+		stop()                 // stop receiving signal notifications as soon as possible.
+	}
+
+	// Output:
+	// context canceled
+}