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26 lines
545 B
Go
26 lines
545 B
Go
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// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build unix
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package unix
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import (
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"syscall"
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_ "unsafe" // for go:linkname
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)
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// Implemented in the runtime package.
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//
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//go:linkname fcntl runtime.fcntl
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func fcntl(fd int32, cmd int32, arg int32) int32
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func Fcntl(fd int, cmd int, arg int) (int, error) {
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val := fcntl(int32(fd), int32(cmd), int32(arg))
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if val < 0 {
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return 0, syscall.Errno(-val)
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}
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return int(val), nil
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}
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