github.com/JimmyHuang454/JLS-go@v0.0.0-20230831150107-90d536585ba0/internal/poll/fcntl_syscall.go (about)

     1  // Copyright 2019 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 dragonfly || freebsd || linux || netbsd || (openbsd && mips64)
     6  
     7  package poll
     8  
     9  import (
    10  	"internal/syscall/unix"
    11  	"syscall"
    12  )
    13  
    14  func fcntl(fd int, cmd int, arg int) (int, error) {
    15  	r, _, e := syscall.Syscall(unix.FcntlSyscall, uintptr(fd), uintptr(cmd), uintptr(arg))
    16  	if e != 0 {
    17  		return int(r), syscall.Errno(e)
    18  	}
    19  	return int(r), nil
    20  }