golang fcntl_syscall 代码
文件路径：/src/internal/poll/fcntl_syscall.go
/ Copyright 2019 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
package poll
import (
"internal/syscall/unix"
"syscall"
)
func fcntl(fd int, cmd int, arg int) (int, error) {
r, _, e := syscall.Syscall(unix.FcntlSyscall, uintptr(fd), uintptr(cmd), uintptr(arg))
if e != 0 {
return int(r), syscall.Errno(e)
}
return int(r), nil
}