diff options
Diffstat (limited to 'libbb/find_root_device.c')
| -rw-r--r-- | libbb/find_root_device.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/libbb/find_root_device.c b/libbb/find_root_device.c index 75ed1a9..edfd708 100644 --- a/libbb/find_root_device.c +++ b/libbb/find_root_device.c @@ -39,16 +39,18 @@ extern char *find_real_root_device_name(const char* name) struct dirent *entry; struct stat statBuf, rootStat; char *fileName; + dev_t dev; if (stat("/", &rootStat) != 0) { - error_msg("could not stat '/'"); + perror_msg("could not stat '/'"); return NULL; } + if ((dev = rootStat.st_rdev)==0) dev=rootStat.st_dev; dir = opendir("/dev"); if (!dir) { - error_msg("could not open '/dev'"); - return NULL; + perror_msg("could not open '/dev'"); + goto fallback; } while((entry = readdir(dir)) != NULL) { @@ -64,14 +66,18 @@ extern char *find_real_root_device_name(const char* name) * devices, so make sure this is a block device */ if (stat(fileName, &statBuf) == 0 && S_ISBLK(statBuf.st_mode)!=0 && - statBuf.st_rdev == rootStat.st_rdev) { + statBuf.st_rdev == dev) { return fileName; } free(fileName); } closedir(dir); - return NULL; +fallback: + /* don't use stack space, caller expects to free() result */ + fileName=xmalloc(20); + sprintf(fileName,"(rdev %u)",(unsigned int) rootStat.st_rdev); + return fileName; } |