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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 linux
package signal
import (
"os"
"syscall"
"testing"
"time"
)
const prSetKeepCaps = 8
// This test validates that syscall.AllThreadsSyscall() can reliably
// reach all 'm' (threads) of the nocgo runtime even when one thread
// is blocked waiting to receive signals from the kernel. This monitors
// for a regression vs. the fix for #43149.
func TestAllThreadsSyscallSignals(t *testing.T) {
if _, _, err := syscall.AllThreadsSyscall(syscall.SYS_PRCTL, prSetKeepCaps, 0, 0); err == syscall.ENOTSUP {
t.Skip("AllThreadsSyscall disabled with cgo")
}
sig := make(chan os.Signal, 1)
Notify(sig, os.Interrupt)
for i := 0; i <= 100; i++ {
if _, _, errno := syscall.AllThreadsSyscall(syscall.SYS_PRCTL, prSetKeepCaps, uintptr(i&1), 0); errno != 0 {
t.Fatalf("[%d] failed to set KEEP_CAPS=%d: %v", i, i&1, errno)
}
}
select {
case <-time.After(10 * time.Millisecond):
case <-sig:
t.Fatal("unexpected signal")
}
Stop(sig)
}
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