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37 lines
1.1 KiB
37 lines
1.1 KiB
// Copyright 2014 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 dragonfly || freebsd || linux || netbsd || openbsd |
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// +build dragonfly freebsd linux netbsd openbsd |
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package unix |
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import "unsafe" |
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// fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux |
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// systems by fcntl_linux_32bit.go to be SYS_FCNTL64. |
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var fcntl64Syscall uintptr = SYS_FCNTL |
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func fcntl(fd int, cmd, arg int) (int, error) { |
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valptr, _, errno := Syscall(fcntl64Syscall, uintptr(fd), uintptr(cmd), uintptr(arg)) |
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var err error |
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if errno != 0 { |
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err = errno |
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} |
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return int(valptr), err |
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} |
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// FcntlInt performs a fcntl syscall on fd with the provided command and argument. |
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func FcntlInt(fd uintptr, cmd, arg int) (int, error) { |
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return fcntl(int(fd), cmd, arg) |
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} |
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// FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command. |
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func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error { |
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_, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk))) |
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if errno == 0 { |
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return nil |
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} |
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return errno |
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}
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