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40bafa33 JA |
1 | #include <sys/types.h> |
2 | #include <sys/stat.h> | |
3 | #include <dirent.h> | |
4 | #include <string.h> | |
5 | #include <stdio.h> | |
6 | #include <unistd.h> | |
7 | ||
10c37df1 | 8 | #include "linux-dev-lookup.h" |
40bafa33 JA |
9 | |
10 | int blktrace_lookup_device(const char *redirect, char *path, unsigned int maj, | |
11 | unsigned int min) | |
12 | { | |
13 | struct dirent *dir; | |
14 | struct stat st; | |
15 | int found = 0; | |
16 | DIR *D; | |
17 | ||
18 | D = opendir(path); | |
19 | if (!D) | |
20 | return 0; | |
21 | ||
22 | while ((dir = readdir(D)) != NULL) { | |
1c3fa6c9 | 23 | char full_path[257]; |
40bafa33 JA |
24 | |
25 | if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, "..")) | |
26 | continue; | |
27 | ||
22497370 | 28 | sprintf(full_path, "%s/%s", path, dir->d_name); |
40bafa33 JA |
29 | if (lstat(full_path, &st) == -1) { |
30 | perror("lstat"); | |
31 | break; | |
32 | } | |
33 | ||
34 | if (S_ISDIR(st.st_mode)) { | |
35 | found = blktrace_lookup_device(redirect, full_path, | |
36 | maj, min); | |
37 | if (found) { | |
38 | strcpy(path, full_path); | |
39 | break; | |
40 | } | |
41 | } | |
42 | ||
43 | if (!S_ISBLK(st.st_mode)) | |
44 | continue; | |
45 | ||
46 | /* | |
47 | * If replay_redirect is set then always return this device | |
48 | * upon lookup which overrides the device lookup based on | |
49 | * major minor in the actual blktrace | |
50 | */ | |
51 | if (redirect) { | |
52 | strcpy(path, redirect); | |
53 | found = 1; | |
54 | break; | |
55 | } | |
56 | ||
57 | if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) { | |
58 | strcpy(path, full_path); | |
59 | found = 1; | |
60 | break; | |
61 | } | |
62 | } | |
63 | ||
64 | closedir(D); | |
65 | return found; | |
66 | } |