On Thu, Feb 13, 2020 at 8:42 AM Alex <alex.rou...@gmail.com> wrote:
>
> I have to pass C pointers between packages so I used uintptr like how syscall
> does things.
> However go vet gives the message "possible misuse of unsafe.Pointer".
>
> Is there something I could do to avoid vet complaining?
>
> Package A:
> type Foo struct {
> procAddr uintptr
> }
>
> func (f Foo) ProcAddr() uintptr {
> return f.procAddr
> }
>
> func Bar() Foo {
> return Foo{C.SomeFunc()}
> }
>
> Package B:
> p := C.ASDF(unsafe.Pointer(A.Bar().ProcAddr())) // possible misuse of
> unsafe.Pointer
If the pointers involved are all C pointers--if they all point to
memory allocated in C--then use little wrapper functions in your cgo
comment to do the conversion to uintptr_t on the C side rather than on
the Go side.
/*
static uintptr_t SomeFuncUintptr() { return (uintptr_t)(SomeFunc()); }
*/
import "C"
Then the Go code will only ever see uintptr values, which is what you want.
To reiterate, this is only safe if the C code is only ever using
pointers to memory allocated in C.
Ian
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