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// Copyright 2019 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.
// Invoke signal hander in the VDSO context (see issue 32912).
package main
import (
"fmt"
"os"
"runtime/pprof"
"time"
)
func init() {
register("SignalInVDSO", signalInVDSO)
}
func signalInVDSO() {
f, err := os.CreateTemp("", "timeprofnow")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
if err := pprof.StartCPUProfile(f); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
t0 := time.Now()
t1 := t0
// We should get a profiling signal 100 times a second,
// so running for 1 second should be sufficient.
for t1.Sub(t0) < time.Second {
t1 = time.Now()
}
pprof.StopCPUProfile()
name := f.Name()
if err := f.Close(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
if err := os.Remove(name); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
fmt.Println("success")
}
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