From 774d135b66f4ba914ee8649ce6e8c3f7d3e36c35 Mon Sep 17 00:00:00 2001 From: Matt Kraai Date: Wed, 23 May 2001 14:45:09 +0000 Subject: Make more robust (patch by Larry Doolittle). --- libbb/find_root_device.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'libbb/find_root_device.c') diff --git a/libbb/find_root_device.c b/libbb/find_root_device.c index 75ed1a979..edfd7085a 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; } -- cgit v1.2.3