src/internal/syscall/unix/fcntl_fuchsia.go

// Copyright 2023 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 fuchsia

package unix

import "syscall"
import "syscall/zx"

func Fcntl(fd int, cmd int, arg int) (int, error) {
	if cmd == syscall.F_GETFL {
		fdio := syscall.FDIOForFD(fd)
		if fdio == nil {
			return 0, syscall.EBADF
		}
		flags, err := fdio.GetFlags()
		if err, ok := err.(*zx.Error); ok && err.Status == zx.ErrNotSupported {
			return 0, nil
		}
		// Don't need to set the NONBLOCK flag because it's always false.
		return int(syscall.ZXIOFlagsToFDIO(uint32(flags))), err
	}
	return 0, syscall.ENOSYS
}