signal_linux_test.go

     1  // Copyright 2020 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build linux
     6  
     7  package signal
     8  
     9  import (
    10  	"os"
    11  	"syscall"
    12  	"testing"
    13  	"time"
    14  )
    15  
    16  const prSetKeepCaps = 8
    17  
    18  // This test validates that syscall.AllThreadsSyscall() can reliably
    19  // reach all 'm' (threads) of the nocgo runtime even when one thread
    20  // is blocked waiting to receive signals from the kernel. This monitors
    21  // for a regression vs. the fix for #43149.
    22  func TestAllThreadsSyscallSignals(t *testing.T) {
    23  	if _, _, err := syscall.AllThreadsSyscall(syscall.SYS_PRCTL, prSetKeepCaps, 0, 0); err == syscall.ENOTSUP {
    24  		t.Skip("AllThreadsSyscall disabled with cgo")
    25  	}
    26  
    27  	sig := make(chan os.Signal, 1)
    28  	Notify(sig, os.Interrupt)
    29  
    30  	for i := 0; i <= 100; i++ {
    31  		if _, _, errno := syscall.AllThreadsSyscall(syscall.SYS_PRCTL, prSetKeepCaps, uintptr(i&1), 0); errno != 0 {
    32  			t.Fatalf("[%d] failed to set KEEP_CAPS=%d: %v", i, i&1, errno)
    33  		}
    34  	}
    35  
    36  	select {
    37  	case <-time.After(10 * time.Millisecond):
    38  	case <-sig:
    39  		t.Fatal("unexpected signal")
    40  	}
    41  	Stop(sig)
    42  }
    43
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