1 // Copyright 2014 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build darwin dragonfly freebsd linux netbsd openbsd 6 7 package unix 8 9 import "unsafe" 10 11 // fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux 12 // systems by flock_linux_32bit.go to be SYS_FCNTL64. 13 var fcntl64Syscall uintptr = SYS_FCNTL 14 15 // FcntlInt performs a fcntl syscall on fd with the provided command and argument. 16 func FcntlInt(fd uintptr, cmd, arg int) (int, error) { 17 valptr, _, err := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(arg)) 18 return int(valptr), err 19 } 20 21 // FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command. 22 func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error { 23 _, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk))) 24 if errno == 0 { 25 return nil 26 } 27 return errno 28 } 29
