gitee.com/ks-custle/core-gm@v0.0.0-20230922171213-b83bdd97b62c/internal/syscall/unix/nonblocking_libc.go (about)

     1  // Copyright 2018 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 aix || darwin || solaris
     6  // +build aix darwin solaris
     7  
     8  package unix
     9  
    10  import (
    11  	"syscall"
    12  	_ "unsafe" // for go:linkname
    13  )
    14  
    15  func IsNonblock(fd int) (nonblocking bool, err error) {
    16  	flag, e1 := fcntl(fd, syscall.F_GETFL, 0)
    17  	if e1 != nil {
    18  		return false, e1
    19  	}
    20  	return flag&syscall.O_NONBLOCK != 0, nil
    21  }
    22  
    23  // Implemented in the syscall package.
    24  //go:linkname fcntl syscall.fcntl
    25  func fcntl(fd int, cmd int, arg int) (int, error)