LXR linux/tools/testing/selftests/android/ion/ionapp

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ionapp_import.c
   4 *
   5 * It is a user space utility to receive android ion memory buffer fd
   6 * over unix domain socket IPC that can be exported by ionapp_export.
   7 * This acts like a client for ionapp_export.
   8 *
   9 * Copyright (C) 2017 Pintu Kumar <pintu.ping@gmail.com>
  10 */
  11
  12#include <stdio.h>
  13#include <stdlib.h>
  14#include <unistd.h>
  15#include <string.h>
  16#include "ionutils.h"
  17#include "ipcsocket.h"
  18
  19
  20int main(void)
  21{
  22        int ret, status;
  23        int sockfd, shared_fd;
  24        unsigned char *map_buf;
  25        unsigned long map_len;
  26        struct ion_buffer_info info;
  27        struct socket_info skinfo;
  28
  29        /* This is the client part. Here 0 means client or importer */
  30        status = opensocket(&sockfd, SOCKET_NAME, 0);
  31        if (status < 0) {
  32                fprintf(stderr, "No exporter exists...\n");
  33                ret = status;
  34                goto err_socket;
  35        }
  36
  37        skinfo.sockfd = sockfd;
  38
  39        ret = socket_receive_fd(&skinfo);
  40        if (ret < 0) {
  41                fprintf(stderr, "Failed: socket_receive_fd\n");
  42                goto err_recv;
  43        }
  44
  45        shared_fd = skinfo.datafd;
  46        printf("Received buffer fd: %d\n", shared_fd);
  47        if (shared_fd <= 0) {
  48                fprintf(stderr, "ERROR: improper buf fd\n");
  49                ret = -1;
  50                goto err_fd;
  51        }
  52
  53        memset(&info, 0, sizeof(info));
  54        info.buffd = shared_fd;
  55        info.buflen = ION_BUFFER_LEN;
  56
  57        ret = ion_import_buffer_fd(&info);
  58        if (ret < 0) {
  59                fprintf(stderr, "Failed: ion_use_buffer_fd\n");
  60                goto err_import;
  61        }
  62
  63        map_buf = info.buffer;
  64        map_len = info.buflen;
  65        read_buffer(map_buf, map_len);
  66
  67        /* Write probably new data to the same buffer again */
  68        map_len = ION_BUFFER_LEN;
  69        write_buffer(map_buf, map_len);
  70
  71err_import:
  72        ion_close_buffer_fd(&info);
  73err_fd:
  74err_recv:
  75err_socket:
  76        closesocket(sockfd, SOCKET_NAME);
  77
  78        return ret;
  79}
  80