nonblocking_wasip1.mx raw

   1  // Copyright 2023 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 wasip1
   6  
   7  package unix
   8  
   9  import (
  10  	"syscall"
  11  	_ "unsafe" // for go:linkname
  12  )
  13  
  14  func IsNonblock(fd int) (nonblocking bool, err error) {
  15  	flags, e1 := fd_fdstat_get_flags(fd)
  16  	if e1 != nil {
  17  		return false, e1
  18  	}
  19  	return flags&syscall.FDFLAG_NONBLOCK != 0, nil
  20  }
  21  
  22  func HasNonblockFlag(flag int) bool {
  23  	return flag&syscall.FDFLAG_NONBLOCK != 0
  24  }
  25  
  26  // This helper is implemented in the syscall package. It means we don't have
  27  // to redefine the fd_fdstat_get host import or the fdstat struct it
  28  // populates.
  29  //
  30  //go:linkname fd_fdstat_get_flags syscall.fd_fdstat_get_flags
  31  func fd_fdstat_get_flags(fd int) (uint32, error)
  32