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package sys
import (
"errors"
"os"
"syscall"
"testing"
"github.com/go-quicktest/qt"
"github.com/cilium/ebpf/internal/unix"
)
func init() {
// Free up fd 0 for TestFD.
stdin, err := unix.FcntlInt(os.Stdin.Fd(), unix.F_DUPFD_CLOEXEC, 1)
if err != nil {
panic(err)
}
old := os.Stdin
os.Stdin = os.NewFile(uintptr(stdin), "stdin")
old.Close()
reserveFdZero()
}
func reserveFdZero() {
fd, err := unix.Open(os.DevNull, syscall.O_RDONLY, 0)
if err != nil {
panic(err)
}
if fd != 0 {
panic(errors.New("zero fd already taken"))
}
}
func TestFD(t *testing.T) {
_, err := NewFD(-1)
qt.Assert(t, qt.IsNotNil(err), qt.Commentf("negative fd should be rejected"))
fd, err := NewFD(0)
qt.Assert(t, qt.IsNil(err))
qt.Assert(t, qt.Not(qt.Equals(fd.Int(), 0)), qt.Commentf("fd value should not be zero"))
qt.Assert(t, qt.IsNil(fd.Close()))
var stat unix.Stat_t
err = unix.Fstat(0, &stat)
qt.Assert(t, qt.ErrorIs(err, unix.EBADF), qt.Commentf("zero fd should be closed"))
reserveFdZero()
}
func TestFDFile(t *testing.T) {
fd := newFD(openFd(t))
file := fd.File("test")
qt.Assert(t, qt.IsNotNil(file))
qt.Assert(t, qt.IsNil(file.Close()))
qt.Assert(t, qt.IsNil(fd.File("closed")))
_, err := fd.Dup()
qt.Assert(t, qt.ErrorIs(err, ErrClosedFd))
}
func openFd(tb testing.TB) int {
fd, err := unix.Open(os.DevNull, syscall.O_RDONLY, 0)
qt.Assert(tb, qt.IsNil(err))
return fd
}
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