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  • // 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 dragonfly || freebsd || linux || netbsd || (openbsd && mips64)
    
    // FcntlSyscall is the number for the fcntl system call. This is
    // usually SYS_FCNTL, but can be overridden to SYS_FCNTL64.
    var FcntlSyscall uintptr = syscall.SYS_FCNTL
    
    
    func IsNonblock(fd int) (nonblocking bool, err error) {
    
    	flag, _, e1 := syscall.Syscall(FcntlSyscall, uintptr(fd), uintptr(syscall.F_GETFL), 0)
    
    	}
    	return flag&syscall.O_NONBLOCK != 0, nil
    }
    
    
    func HasNonblockFlag(flag int) bool {
    	return flag&syscall.O_NONBLOCK != 0
    }