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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.
//go:build unix
package runtime_test
import (
"runtime"
"syscall"
"testing"
"unsafe"
)
func TestNonblockingPipe(t *testing.T) {
// NonblockingPipe is the test name for nonblockingPipe.
r, w, errno := runtime.NonblockingPipe()
if errno != 0 {
t.Fatal(syscall.Errno(errno))
}
defer runtime.Close(w)
checkIsPipe(t, r, w)
checkNonblocking(t, r, "reader")
checkCloseonexec(t, r, "reader")
checkNonblocking(t, w, "writer")
checkCloseonexec(t, w, "writer")
// Test that fcntl returns an error as expected.
if runtime.Close(r) != 0 {
t.Fatalf("Close(%d) failed", r)
}
val := runtime.Fcntl(r, syscall.F_GETFD, 0)
if val >= 0 {
t.Errorf("Fcntl succeeded unexpectedly")
} else if syscall.Errno(-val) != syscall.EBADF {
t.Errorf("Fcntl failed with error %v, expected %v", -val, syscall.EBADF)
}
}
func checkIsPipe(t *testing.T, r, w int32) {
bw := byte(42)
if n := runtime.Write(uintptr(w), unsafe.Pointer(&bw), 1); n != 1 {
t.Fatalf("Write(w, &b, 1) == %d, expected 1", n)
}
var br byte
if n := runtime.Read(r, unsafe.Pointer(&br), 1); n != 1 {
t.Fatalf("Read(r, &b, 1) == %d, expected 1", n)
}
if br != bw {
t.Errorf("pipe read %d, expected %d", br, bw)
}
}
func checkNonblocking(t *testing.T, fd int32, name string) {
t.Helper()
flags := runtime.Fcntl(fd, syscall.F_GETFL, 0)
if flags < 0 {
t.Errorf("fcntl(%s, F_GETFL) failed: %v", name, syscall.Errno(-flags))
} else if flags&syscall.O_NONBLOCK == 0 {
t.Errorf("O_NONBLOCK not set in %s flags %#x", name, flags)
}
}
func checkCloseonexec(t *testing.T, fd int32, name string) {
t.Helper()
flags := runtime.Fcntl(fd, syscall.F_GETFD, 0)
if flags < 0 {
t.Errorf("fcntl(%s, F_GETFD) failed: %v", name, syscall.Errno(flags))
} else if flags&syscall.FD_CLOEXEC == 0 {
t.Errorf("FD_CLOEXEC not set in %s flags %#x", name, flags)
}
}
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