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sys.go
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sys.go
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//go:build windows
// +build windows
/*
* Copyright 2019-2020 by Nedim Sabic Sabic
* https://www.fibratus.io
* All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package sys
import (
"fmt"
"github.com/rabbitstack/fibratus/pkg/errors"
"github.com/rabbitstack/fibratus/pkg/syscall/object"
"github.com/rabbitstack/fibratus/pkg/syscall/winerrno"
"syscall"
"unsafe"
)
var (
native = syscall.NewLazyDLL("ntdll")
ntQuerySystemInformation = native.NewProc("NtQuerySystemInformation")
rtlNtStatusToDosError = native.NewProc("RtlNtStatusToDosError")
)
// QuerySystemInformation retrieves system low-level information.
func QuerySystemInformation(class object.InformationClass, buf []byte) (uint32, error) {
size := uint32(0)
status, _, _ := ntQuerySystemInformation.Call(uintptr(class),
uintptr(unsafe.Pointer(&buf[0])),
uintptr(len(buf)),
uintptr(unsafe.Pointer(&size)))
if status != 0 {
if status == winerrno.StatusInfoLengthMismatch || status == winerrno.StatusBufferTooSmall {
return size, errors.ErrNeedsReallocateBuffer
}
return size, fmt.Errorf("NtQuerySystemInformation failed with status code 0x%X", status)
}
return size, nil
}
// CodeFromNtStatus converts the specified NTSTATUS code to its equivalent system error code.
func CodeFromNtStatus(status uint32) uint32 {
code, _, _ := rtlNtStatusToDosError.Call(uintptr(status))
return uint32(code)
}