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30 lines
724 B
Go
30 lines
724 B
Go
// Copyright 2021 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 aix || darwin || solaris
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package net
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import (
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"syscall"
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_ "unsafe"
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)
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// Use a helper function to call fcntl. This is defined in C in
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// libgo/runtime.
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//extern __go_fcntl_uintptr
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func libc_fcntl(uintptr, uintptr, uintptr) (uintptr, uintptr)
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// Implemented in the syscall package.
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//go:linkname fcntl syscall.fcntl
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func fcntl(fd int, cmd int, arg int) (int, error) {
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syscall.Entersyscall()
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r, e := libc_fcntl(uintptr(fd), uintptr(cmd), uintptr(arg))
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syscall.Exitsyscall()
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if e != 0 {
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return int(r), syscall.Errno(e)
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}
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return int(r), nil
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}
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