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)