// 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 darwin 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 }