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// 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
}
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