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// Copyright 2023 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 unix
package unix
import (
"syscall"
_ "unsafe" // for go:linkname
)
// Implemented in the runtime package.
//
//go:linkname fcntl runtime.fcntl
func fcntl(fd int32, cmd int32, arg int32) (int32, int32)
func Fcntl(fd int, cmd int, arg int) (int, error) {
val, errno := fcntl(int32(fd), int32(cmd), int32(arg))
if val == -1 {
return int(val), syscall.Errno(errno)
}
return int(val), nil
}