libudev: fix udev_queue_get_seqnum_sequence_is_finished() with empty queue file

We an empty or garbage-collected queue file, we might not have a record
for the first sequence we wait for, and therefore must not wait for it.

diff --git a/Makefile.am b/Makefile.am
index 8406a6bc316028b30fc31425bbe4e04675b92872..21cd46d751c63d880cde8a497162725c5fe862e1 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -29,7 +29,7 @@ CLEANFILES =
 # libudev
 # ------------------------------------------------------------------------------
 LIBUDEV_CURRENT=8
-LIBUDEV_REVISION=1
+LIBUDEV_REVISION=2
 LIBUDEV_AGE=8
 
 SUBDIRS += libudev/docs

diff --git a/libudev/libudev-queue.c b/libudev/libudev-queue.c
index f3cb5ab4986594b4a3e53e93a02508d2858f4160..d305db6578e8ece4468693ce5f22492121e462b8 100644 (file)
--- a/libudev/libudev-queue.c
+++ b/libudev/libudev-queue.c
@@ -299,7 +299,7 @@ int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
        if (queue_file == NULL)
                return 1;
 
-       while (1) {
+       for (;;) {
                unsigned long long int seqnum;
                ssize_t devpath_len;
 
@@ -348,7 +348,7 @@ out:
 int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue *udev_queue,
                                               unsigned long long int start, unsigned long long int end)
 {
-       unsigned long long int seqnum = 0;
+       unsigned long long int seqnum;
        ssize_t devpath_len;
        int unfinished;
        FILE *queue_file;
@@ -368,20 +368,33 @@ int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue *udev_queue,
                fclose(queue_file);
                return -EOVERFLOW;
        }
-       unfinished = (end - start) + 1;
 
-       while (unfinished > 0) {
+       /*
+        * we might start with 0, and handle the initial seqnum
+        * only when we find an entry in the queue file
+        **/
+       unfinished = end - start;
+
+       do {
                if (udev_queue_read_seqnum(queue_file, &seqnum) < 0)
                        break;
                devpath_len = udev_queue_skip_devpath(queue_file);
                if (devpath_len < 0)
                        break;
 
+               /*
+                * we might start with an empty or re-build queue file, where
+                * the initial seqnum is not recorded as finished
+                */
+               if (start == seqnum && devpath_len > 0)
+                       unfinished++;
+
                if (devpath_len == 0) {
                        if (seqnum >= start && seqnum <= end)
                                unfinished--;
                }
-       }
+       } while (unfinished > 0);
+
        fclose(queue_file);
 
        return (unfinished == 0);