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| // Copyright 2014 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.
|
| // +build dragonfly freebsd linux netbsd openbsd
|
| package unix
|
| import "unsafe"
|
| // fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux
| // systems by flock_linux_32bit.go to be SYS_FCNTL64.
| var fcntl64Syscall uintptr = SYS_FCNTL
|
| // FcntlInt performs a fcntl syscall on fd with the provided command and argument.
| func FcntlInt(fd uintptr, cmd, arg int) (int, error) {
| valptr, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(arg))
| var err error
| if errno != 0 {
| err = errno
| }
| return int(valptr), err
| }
|
| // FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
| func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
| _, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk)))
| if errno == 0 {
| return nil
| }
| return errno
| }
|
|
