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 #ifdef __NR_mlock2
10 return syscall(__NR_mlock2, start, len, flags);
11 #else
12 errno = ENOSYS;
13 return -1;
14 #endif
15 }
16
seek_to_smaps_entry(unsigned long addr)17 static FILE *seek_to_smaps_entry(unsigned long addr)
18 {
19 FILE *file;
20 char *line = NULL;
21 size_t size = 0;
22 unsigned long start, end;
23 char perms[5];
24 unsigned long offset;
25 char dev[32];
26 unsigned long inode;
27 char path[BUFSIZ];
28
29 file = fopen("/proc/self/smaps", "r");
30 if (!file) {
31 perror("fopen smaps");
32 _exit(1);
33 }
34
35 while (getline(&line, &size, file) > 0) {
36 if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
37 &start, &end, perms, &offset, dev, &inode, path) < 6)
38 goto next;
39
40 if (start <= addr && addr < end)
41 goto out;
42
43 next:
44 free(line);
45 line = NULL;
46 size = 0;
47 }
48
49 fclose(file);
50 file = NULL;
51
52 out:
53 free(line);
54 return file;
55 }
56