1
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
15static 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
25static 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
51next:
52 free(line);
53 line = NULL;
54 size = 0;
55 }
56
57 fclose(file);
58 file = NULL;
59
60out:
61 free(line);
62 return file;
63}
64
