unveil_openbsd.go

     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  
     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  }
    43
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