rss-tools: vendor/golang.org/x/sys/unix/unveil_openbsd.go (a5ac52722b131734c74504b6e6f4d9900536cac7)

rss-tools/vendor/golang.org/x/sys/unix/unveil_openbsd.go (view raw)

Oleksandr Smirnov we're vendoring now, 7 days ago

// 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.

package unix

import "fmt"

// 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 {
	if err := supportsUnveil(); err != nil {
		return err
	}
	pathPtr, err := BytePtrFromString(path)
	if err != nil {
		return err
	}
	flagsPtr, err := BytePtrFromString(flags)
	if err != nil {
		return err
	}
	return unveil(pathPtr, flagsPtr)
}

// UnveilBlock blocks future unveil calls.
// For more information see unveil(2).
func UnveilBlock() error {
	if err := supportsUnveil(); err != nil {
		return err
	}
	return unveil(nil, nil)
}

// supportsUnveil checks for availability of the unveil(2) system call based
// on the running OpenBSD version.
func supportsUnveil() error {
	maj, min, err := majmin()
	if err != nil {
		return err
	}

	// unveil is not available before 6.4
	if maj < 6 || (maj == 6 && min <= 3) {
		return fmt.Errorf("cannot call Unveil on OpenBSD %d.%d", maj, min)
	}

	return nil
}

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 "fmt"
8
9	// Unveil implements the unveil syscall.
10	// For more information see unveil(2).
11	// Note that the special case of blocking further
12	// unveil calls is handled by UnveilBlock.
13	func Unveil(path string, flags string) error {
14	if err := supportsUnveil(); err != nil {
15	return err
16	}
17	pathPtr, err := BytePtrFromString(path)
18	if err != nil {
19	return err
20	}
21	flagsPtr, err := BytePtrFromString(flags)
22	if err != nil {
23	return err
24	}
25	return unveil(pathPtr, flagsPtr)
26	}
27
28	// UnveilBlock blocks future unveil calls.
29	// For more information see unveil(2).
30	func UnveilBlock() error {
31	if err := supportsUnveil(); err != nil {
32	return err
33	}
34	return unveil(nil, nil)
35	}
36
37	// supportsUnveil checks for availability of the unveil(2) system call based
38	// on the running OpenBSD version.
39	func supportsUnveil() error {
40	maj, min, err := majmin()
41	if err != nil {
42	return err
43	}
44
45	// unveil is not available before 6.4
46	if maj < 6 \|\| (maj == 6 && min <= 3) {
47	return fmt.Errorf("cannot call Unveil on OpenBSD %d.%d", maj, min)
48	}
49
50	return nil
51	}