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process: implement NumFDs for Windows #1454

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32 changes: 31 additions & 1 deletion process/process_windows.go
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Original file line number Diff line number Diff line change
Expand Up @@ -549,7 +549,37 @@ func (p *Process) NumCtxSwitchesWithContext(ctx context.Context) (*NumCtxSwitche
}

func (p *Process) NumFDsWithContext(ctx context.Context) (int32, error) {
return 0, common.ErrNotImplementedError
buffer := make([]byte, 1024)
var size uint32

st := common.CallWithExpandingBuffer(
func() common.NtStatus {
return common.NtQuerySystemInformation(
common.SystemExtendedHandleInformationClass,
&buffer[0],
uint32(len(buffer)),
&size,
)
},
&buffer,
&size,
)
if st.IsError() {
return 0, st.Error()
}

handlesList := (*common.SystemExtendedHandleInformation)(unsafe.Pointer(&buffer[0]))
handles := make([]common.SystemExtendedHandleTableEntryInformation, int(handlesList.NumberOfHandles))
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&handles))
hdr.Data = uintptr(unsafe.Pointer(&handlesList.Handles[0]))

var handleCount int32
for _, handle := range handles {
if int32(handle.UniqueProcessId) == p.Pid {
handleCount++
}
}
return handleCount, nil
}

func (p *Process) NumThreadsWithContext(ctx context.Context) (int32, error) {
Expand Down