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51 lines
1.2 KiB
51 lines
1.2 KiB
// Copyright 2018 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package unix |
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import "fmt" |
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// Unveil implements the unveil syscall. |
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// For more information see unveil(2). |
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// Note that the special case of blocking further |
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// unveil calls is handled by UnveilBlock. |
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func Unveil(path string, flags string) error { |
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if err := supportsUnveil(); err != nil { |
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return err |
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} |
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pathPtr, err := BytePtrFromString(path) |
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if err != nil { |
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return err |
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} |
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flagsPtr, err := BytePtrFromString(flags) |
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if err != nil { |
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return err |
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} |
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return unveil(pathPtr, flagsPtr) |
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} |
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// UnveilBlock blocks future unveil calls. |
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// For more information see unveil(2). |
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func UnveilBlock() error { |
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if err := supportsUnveil(); err != nil { |
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return err |
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} |
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return unveil(nil, nil) |
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} |
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// supportsUnveil checks for availability of the unveil(2) system call based |
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// on the running OpenBSD version. |
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func supportsUnveil() error { |
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maj, min, err := majmin() |
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if err != nil { |
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return err |
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} |
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// unveil is not available before 6.4 |
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if maj < 6 || (maj == 6 && min <= 3) { |
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return fmt.Errorf("cannot call Unveil on OpenBSD %d.%d", maj, min) |
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} |
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return nil |
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}
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