projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e90fda06 JO |
1 | |
| 2 | #include "util.h" | |
| 3 | #include "sysfs.h" | |
| 4 | ||
| 5 | static const char * const sysfs_known_mountpoints[] = { | |
| 6 | "/sys", | |
| 7 | 0, | |
| 8 | }; | |
| 9 | ||
| 10 | static int sysfs_found; | |
| a65c2342 | 11 | char sysfs_mountpoint[PATH_MAX + 1]; |
| e90fda06 JO |
12 | |
| 13 | static int sysfs_valid_mountpoint(const char *sysfs) | |
| 14 | { | |
| 15 | struct statfs st_fs; | |
| 16 | ||
| 17 | if (statfs(sysfs, &st_fs) < 0) | |
| 18 | return -ENOENT; | |
| 19 | else if (st_fs.f_type != (long) SYSFS_MAGIC) | |
| 20 | return -ENOENT; | |
| 21 | ||
| 22 | return 0; | |
| 23 | } | |
| 24 | ||
| 25 | const char *sysfs_find_mountpoint(void) | |
| 26 | { | |
| 27 | const char * const *ptr; | |
| 28 | char type[100]; | |
| 29 | FILE *fp; | |
| 30 | ||
| 31 | if (sysfs_found) | |
| 32 | return (const char *) sysfs_mountpoint; | |
| 33 | ||
| 34 | ptr = sysfs_known_mountpoints; | |
| 35 | while (*ptr) { | |
| 36 | if (sysfs_valid_mountpoint(*ptr) == 0) { | |
| 37 | sysfs_found = 1; | |
| 38 | strcpy(sysfs_mountpoint, *ptr); | |
| 39 | return sysfs_mountpoint; | |
| 40 | } | |
| 41 | ptr++; | |
| 42 | } | |
| 43 | ||
| 44 | /* give up and parse /proc/mounts */ | |
| 45 | fp = fopen("/proc/mounts", "r"); | |
| 46 | if (fp == NULL) | |
| 47 | return NULL; | |
| 48 | ||
| 49 | while (!sysfs_found && | |
| 50 | fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n", | |
| 51 | sysfs_mountpoint, type) == 2) { | |
| 52 | ||
| 53 | if (strcmp(type, "sysfs") == 0) | |
| 54 | sysfs_found = 1; | |
| 55 | } | |
| 56 | ||
| 57 | fclose(fp); | |
| 58 | ||
| 59 | return sysfs_found ? sysfs_mountpoint : NULL; | |
| 60 | } |