X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libringbuffer%2Fshm.c;fp=libringbuffer%2Fshm.c;h=8ac321e3931906888f79dd9e2419a7dbca8225de;hb=429dadf0e28fe24be158ddb76d09f5f2308b6467;hp=c4c651e4b925543e373e9b016398636be4c03293;hpb=d742d2aadf357e5256a0d06196dbffcbf80294b2;p=lttng-ust.git

diff --git a/libringbuffer/shm.c b/libringbuffer/shm.c
index c4c651e4..8ac321e3 100644
--- a/libringbuffer/shm.c
+++ b/libringbuffer/shm.c
@@ -39,6 +39,9 @@
  * Ensure we have the required amount of space available by writing 0
  * into the entire buffer. Not doing so can trigger SIGBUS when going
  * beyond the available shm space.
+ *
+ * Also ensure the file metadata is synced with the storage by using
+ * fsync(2).
  */
 static
 int zero_file(int fd, size_t len)
@@ -67,6 +70,11 @@ int zero_file(int fd, size_t len)
 		}
 		written += retlen;
 	}
+	ret = fsync(fd);
+	if (ret) {
+		ret = (int) -errno;
+		goto error;
+	}
 	ret = 0;
 error:
 	free(zeropage);