William Kurkian | ea86948 | 2019-04-09 15:16:11 -0400 | [diff] [blame] | 1 | // Copyright 2018 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 | |
William Kurkian | ea86948 | 2019-04-09 15:16:11 -0400 | [diff] [blame] | 5 | package unix |
| 6 | |
| 7 | import ( |
| 8 | "syscall" |
| 9 | "unsafe" |
| 10 | ) |
| 11 | |
| 12 | // Unveil implements the unveil syscall. |
| 13 | // For more information see unveil(2). |
| 14 | // Note that the special case of blocking further |
| 15 | // unveil calls is handled by UnveilBlock. |
| 16 | func Unveil(path string, flags string) error { |
| 17 | pathPtr, err := syscall.BytePtrFromString(path) |
| 18 | if err != nil { |
| 19 | return err |
| 20 | } |
| 21 | flagsPtr, err := syscall.BytePtrFromString(flags) |
| 22 | if err != nil { |
| 23 | return err |
| 24 | } |
| 25 | _, _, e := syscall.Syscall(SYS_UNVEIL, uintptr(unsafe.Pointer(pathPtr)), uintptr(unsafe.Pointer(flagsPtr)), 0) |
| 26 | if e != 0 { |
| 27 | return e |
| 28 | } |
| 29 | return nil |
| 30 | } |
| 31 | |
| 32 | // UnveilBlock blocks future unveil calls. |
| 33 | // For more information see unveil(2). |
| 34 | func UnveilBlock() error { |
| 35 | // Both pointers must be nil. |
| 36 | var pathUnsafe, flagsUnsafe unsafe.Pointer |
| 37 | _, _, e := syscall.Syscall(SYS_UNVEIL, uintptr(pathUnsafe), uintptr(flagsUnsafe), 0) |
| 38 | if e != 0 { |
| 39 | return e |
| 40 | } |
| 41 | return nil |
| 42 | } |