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
mlock2_(void * start,size_t len,int flags)14 static 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
seek_to_smaps_entry(unsigned long addr)24 static 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
50 next:
51 free(line);
52 line = NULL;
53 size = 0;
54 }
55
56 fclose(file);
57 file = NULL;
58
59 out:
60 free(line);
61 return file;
62 }
63