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Linux file watcher: parse mount table programmatically

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This commit is contained in:
Roman Shevchenko
2012-10-02 16:41:52 +02:00
parent 8aaaa34d83
commit 212a23df6a
3 changed files with 12 additions and 24 deletions
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bin/linux/fsnotifier
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native/fsNotifier/linux/main.c
+12 -24
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@@ -18,6 +18,8 @@
#include <errno.h>
#include <limits.h>
#include <mntent.h>
#include <paths.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
@@ -362,45 +364,31 @@ static bool register_roots(array* new_roots, array* unwatchable, array* mounts)
}
static bool is_watchable(const char* dev, const char* mnt, const char* fs) {
static bool is_watchable(const char* mnt, const char* fs) {
// don't watch special and network filesystems
return !(strncmp(mnt, "/dev", 4) == 0 || strncmp(mnt, "/proc", 5) == 0 || strncmp(mnt, "/sys", 4) == 0 ||
strncmp(fs, "fuse.", 5) == 0 || strcmp(fs, "cifs") == 0 || strcmp(fs, "nfs") == 0);
strncmp(fs, "fuse.", 5) == 0 || strcmp(fs, "cifs") == 0 || strcmp(fs, MNTTYPE_NFS) == 0 || strcmp(fs, MNTTYPE_SWAP) == 0);
}
#define MTAB_DELIMS " \t"
static array* unwatchable_mounts() {
FILE* mtab = fopen("/etc/mtab", "r");
FILE* mtab = setmntent(_PATH_MOUNTED, "r");
if (mtab == NULL) {
mtab = fopen("/proc/mounts", "r");
}
if (mtab == NULL) {
userlog(LOG_ERR, "neither /etc/mtab nor /proc/mounts can be read");
userlog(LOG_ERR, "cannot open " _PATH_MOUNTED);
return NULL;
}
array* mounts = array_create(20);
CHECK_NULL(mounts, NULL);
char* line;
while ((line = read_line(mtab)) != NULL) {
userlog(LOG_DEBUG, "mtab: %s", line);
char* dev = strtok(line, MTAB_DELIMS);
char* point = strtok(NULL, MTAB_DELIMS);
char* fs = strtok(NULL, MTAB_DELIMS);
if (dev == NULL || point == NULL || fs == NULL) {
userlog(LOG_ERR, "can't parse mount line");
return NULL;
}
if (!is_watchable(dev, point, fs)) {
CHECK_NULL(array_push(mounts, strdup(point)), NULL);
struct mntent* ent;
while ((ent = getmntent(mtab)) != NULL) {
userlog(LOG_DEBUG, "mtab: %s : %s", ent->mnt_dir, ent->mnt_type);
if (strcmp(ent->mnt_type, MNTTYPE_IGNORE) != 0 && !is_watchable(ent->mnt_dir, ent->mnt_type)) {
CHECK_NULL(array_push(mounts, strdup(ent->mnt_dir)), NULL);
}
}
fclose(mtab);
endmntent(mtab);
return mounts;
}