1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <syscall.h>
3 #include <errno.h>
4 #include <stdio.h>
5 #include <stdlib.h>
6
mlock2_(void * start,size_t len,int flags)7 static int mlock2_(void *start, size_t len, int flags)
8 {
9 int ret = syscall(__NR_mlock2, start, len, flags);
10
11 if (ret) {
12 errno = ret;
13 return -1;
14 }
15 return 0;
16 }
17
seek_to_smaps_entry(unsigned long addr)18 static FILE *seek_to_smaps_entry(unsigned long addr)
19 {
20 FILE *file;
21 char *line = NULL;
22 size_t size = 0;
23 unsigned long start, end;
24 char perms[5];
25 unsigned long offset;
26 char dev[32];
27 unsigned long inode;
28 char path[BUFSIZ];
29
30 file = fopen("/proc/self/smaps", "r");
31 if (!file)
32 ksft_exit_fail_msg("fopen smaps: %s\n", strerror(errno));
33
34 while (getline(&line, &size, file) > 0) {
35 if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
36 &start, &end, perms, &offset, dev, &inode, path) < 6)
37 goto next;
38
39 if (start <= addr && addr < end)
40 goto out;
41
42 next:
43 free(line);
44 line = NULL;
45 size = 0;
46 }
47
48 fclose(file);
49 file = NULL;
50
51 out:
52 free(line);
53 return file;
54 }
55