path: root/vendor/golang.org/x/sys/unix/openbsd_unveil.go

// Copyright 2018 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 openbsd

package unix

import (
    "syscall"
    "unsafe"
)

// Unveil implements the unveil syscall.
// For more information see unveil(2).
// Note that the special case of blocking further
// unveil calls is handled by UnveilBlock.
func Unveil(path string, flags string) error {
    pathPtr, err := syscall.BytePtrFromString(path)
    if err != nil {
        return err
    }
    flagsPtr, err := syscall.BytePtrFromString(flags)
    if err != nil {
        return err
    }
    _, _, e := syscall.Syscall(SYS_UNVEIL, uintptr(unsafe.Pointer(pathPtr)), uintptr(unsafe.Pointer(flagsPtr)), 0)
    if e != 0 {
        return e
    }
    return nil
}

// UnveilBlock blocks future unveil calls.
// For more information see unveil(2).
func UnveilBlock() error {
    // Both pointers must be nil.
    var pathUnsafe, flagsUnsafe unsafe.Pointer
    _, _, e := syscall.Syscall(SYS_UNVEIL, uintptr(pathUnsafe), uintptr(flagsUnsafe), 0)
    if e != 0 {
        return e
    }
    return nil
}