1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <syscall.h>
3 #include <errno.h>
4 #include <stdio.h>
5 #include <stdlib.h>
6
7 #ifndef MLOCK_ONFAULT
8 #define MLOCK_ONFAULT 1
9 #endif
10
11 #ifndef MCL_ONFAULT
12 #define MCL_ONFAULT (MCL_FUTURE << 1)
13 #endif
14
mlock2_(void * start,size_t len,int flags)15 static int mlock2_(void *start, size_t len, int flags)
16 {
17 #ifdef __NR_mlock2
18 return syscall(__NR_mlock2, start, len, flags);
19 #else
20 errno = ENOSYS;
21 return -1;
22 #endif
23 }
24
seek_to_smaps_entry(unsigned long addr)25 static FILE *seek_to_smaps_entry(unsigned long addr)
26 {
27 FILE *file;
28 char *line = NULL;
29 size_t size = 0;
30 unsigned long start, end;
31 char perms[5];
32 unsigned long offset;
33 char dev[32];
34 unsigned long inode;
35 char path[BUFSIZ];
36
37 file = fopen("/proc/self/smaps", "r");
38 if (!file) {
39 perror("fopen smaps");
40 _exit(1);
41 }
42
43 while (getline(&line, &size, file) > 0) {
44 if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
45 &start, &end, perms, &offset, dev, &inode, path) < 6)
46 goto next;
47
48 if (start <= addr && addr < end)
49 goto out;
50
51 next:
52 free(line);
53 line = NULL;
54 size = 0;
55 }
56
57 fclose(file);
58 file = NULL;
59
60 out:
61 free(line);
62 return file;
63 }
64