// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "koid_util.h"

#include <zircon/assert.h>
#include <zircon/errors.h>

zx_status_t get_channel_koids(const zx::channel& this_end,
                              zx_koid_t* this_end_koid,
                              zx_koid_t* that_end_koid) {
    ZX_DEBUG_ASSERT(this_end_koid);
    ZX_DEBUG_ASSERT(that_end_koid);
    zx_info_handle_basic_t token_info{};
    size_t actual_count = 0;
    size_t avail_count = 0;
    zx_status_t get_info_status =
        this_end.get_info(ZX_INFO_HANDLE_BASIC, &token_info, sizeof(token_info),
                          &actual_count, &avail_count);
    if (get_info_status != ZX_OK) {
        return get_info_status;
    }
    ZX_DEBUG_ASSERT(actual_count == 1);
    ZX_DEBUG_ASSERT(avail_count == 1);
    if (token_info.type != ZX_OBJ_TYPE_CHANNEL) {
        return ZX_ERR_WRONG_TYPE;
    }
    ZX_DEBUG_ASSERT(token_info.koid != 0);
    ZX_DEBUG_ASSERT(token_info.related_koid != 0);
    *this_end_koid = token_info.koid;
    *that_end_koid = token_info.related_koid;
    return ZX_OK;
}