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