chore: vendor

vendor/golang.org/x/sys/unix/pledge_openbsd.go

@@ -0,0 +1,111 @@
+// Copyright 2016 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 (
+	"errors"
+	"fmt"
+	"strconv"
+)
+
+// Pledge implements the pledge syscall.
+//
+// This changes both the promises and execpromises; use PledgePromises or
+// PledgeExecpromises to only change the promises or execpromises
+// respectively.
+//
+// For more information see pledge(2).
+func Pledge(promises, execpromises string) error {
+	if err := pledgeAvailable(); err != nil {
+		return err
+	}
+
+	pptr, err := BytePtrFromString(promises)
+	if err != nil {
+		return err
+	}
+
+	exptr, err := BytePtrFromString(execpromises)
+	if err != nil {
+		return err
+	}
+
+	return pledge(pptr, exptr)
+}
+
+// PledgePromises implements the pledge syscall.
+//
+// This changes the promises and leaves the execpromises untouched.
+//
+// For more information see pledge(2).
+func PledgePromises(promises string) error {
+	if err := pledgeAvailable(); err != nil {
+		return err
+	}
+
+	pptr, err := BytePtrFromString(promises)
+	if err != nil {
+		return err
+	}
+
+	return pledge(pptr, nil)
+}
+
+// PledgeExecpromises implements the pledge syscall.
+//
+// This changes the execpromises and leaves the promises untouched.
+//
+// For more information see pledge(2).
+func PledgeExecpromises(execpromises string) error {
+	if err := pledgeAvailable(); err != nil {
+		return err
+	}
+
+	exptr, err := BytePtrFromString(execpromises)
+	if err != nil {
+		return err
+	}
+
+	return pledge(nil, exptr)
+}
+
+// majmin returns major and minor version number for an OpenBSD system.
+func majmin() (major int, minor int, err error) {
+	var v Utsname
+	err = Uname(&v)
+	if err != nil {
+		return
+	}
+
+	major, err = strconv.Atoi(string(v.Release[0]))
+	if err != nil {
+		err = errors.New("cannot parse major version number returned by uname")
+		return
+	}
+
+	minor, err = strconv.Atoi(string(v.Release[2]))
+	if err != nil {
+		err = errors.New("cannot parse minor version number returned by uname")
+		return
+	}
+
+	return
+}
+
+// pledgeAvailable checks for availability of the pledge(2) syscall
+// based on the running OpenBSD version.
+func pledgeAvailable() error {
+	maj, min, err := majmin()
+	if err != nil {
+		return err
+	}
+
+	// Require OpenBSD 6.4 as a minimum.
+	if maj < 6 || (maj == 6 && min <= 3) {
+		return fmt.Errorf("cannot call Pledge on OpenBSD %d.%d", maj, min)
+	}
+
+	return nil
+}