go nonblocking_libc 源码
golang nonblocking_libc 代码
文件路径：/src/internal/syscall/unix/nonblocking_libc.go
// Copyright 2018 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 aix || darwin || solaris
package unix
import (
"syscall"
_ "unsafe" // for go:linkname
)
func IsNonblock(fd int) (nonblocking bool, err error) {
flag, e1 := fcntl(fd, syscall.F_GETFL, 0)
if e1 != nil {
return false, e1
}
return flag&syscall.O_NONBLOCK != 0, nil
}
// Implemented in the syscall package.
//
//go:linkname fcntl syscall.fcntl
func fcntl(fd int, cmd int, arg int) (int, error)
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