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|
package main
import (
"errors"
"fmt"
"syscall"
"testing"
)
func TestIsUnsupportedEpollPwait2Err(t *testing.T) {
t.Parallel()
tests := []struct {
name string
err error
want bool
}{
{name: "nil", err: nil, want: false},
{name: "enosys", err: fmt.Errorf("epoll_pwait2: %w", syscall.ENOSYS), want: true},
{name: "enotsup", err: fmt.Errorf("epoll_pwait2: %w", syscall.ENOTSUP), want: true},
{name: "einval", err: fmt.Errorf("epoll_pwait2: %w", syscall.EINVAL), want: false},
{name: "opaque", err: fmt.Errorf("epoll_pwait2: not-supported"), want: false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
got := isUnsupportedEpollPwait2Err(tt.err)
if got != tt.want {
t.Fatalf("isUnsupportedEpollPwait2Err(%v) = %v, want %v", tt.err, got, tt.want)
}
})
}
}
func TestFdSetSetMarksBit(t *testing.T) {
t.Parallel()
var set fdSet
if err := set.set(65); err != nil {
t.Fatalf("set(65) unexpected error: %v", err)
}
if set[1]&(1<<1) == 0 {
t.Fatalf("fd bit was not set: %#v", set)
}
}
func TestFdSetSetRejectsOutOfRange(t *testing.T) {
t.Parallel()
tests := []struct {
name string
fd int
}{
{name: "exactly_1024", fd: 1024},
{name: "large_fd", fd: 4096},
{name: "negative_fd", fd: -1},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
var set fdSet
err := set.set(tt.fd)
if err == nil {
t.Fatalf("set(%d) should return error, got nil", tt.fd)
}
if !errors.Is(err, errFDOutOfRange) {
t.Fatalf("set(%d) error = %v, want %v", tt.fd, err, errFDOutOfRange)
}
})
}
}
func TestClassicPollingSyscallsReturnReadyCount(t *testing.T) {
var pipefd [2]int
if err := syscall.Pipe(pipefd[:]); err != nil {
t.Fatalf("pipe: %v", err)
}
defer syscall.Close(pipefd[0]) //nolint:errcheck
defer syscall.Close(pipefd[1]) //nolint:errcheck
waiters := []struct {
name string
fn readinessWaitFn
}{
{name: "poll", fn: callPoll},
{name: "ppoll", fn: callPpoll},
{name: "select", fn: callSelect},
{name: "pselect6", fn: callPselect6},
}
for _, waiter := range waiters {
t.Run(waiter.name, func(t *testing.T) {
if _, err := syscall.Write(pipefd[1], []byte{1}); err != nil {
t.Fatalf("write wake byte: %v", err)
}
ready, err := waiter.fn(pipefd)
if err != nil {
if isUnsupportedPollingErr(err) {
t.Skipf("%s unsupported on this kernel: %v", waiter.name, err)
}
t.Fatalf("%s: %v", waiter.name, err)
}
if ready < 1 {
t.Fatalf("%s ready count = %d, want >=1", waiter.name, ready)
}
if err := drainWakeByte(pipefd[0]); err != nil {
t.Fatalf("drain wake byte: %v", err)
}
})
}
}
func isUnsupportedPollingErr(err error) bool {
if err == nil {
return false
}
var errno syscall.Errno
if !errors.As(err, &errno) {
return false
}
return errno == syscall.ENOSYS || errno == syscall.ENOTSUP
}
|
