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-rw-r--r--src/vu-rewrite-head.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/vu-rewrite-head.c b/src/vu-rewrite-head.c
index e7663c8..47d14ae 100644
--- a/src/vu-rewrite-head.c
+++ b/src/vu-rewrite-head.c
@@ -50,6 +50,8 @@ rewrite(struct stream *stream, int frames_auto)
eprintf("ftruncate %s:", stream->file);
data = mmap(0, length + (size_t)headlen, PROT_READ | PROT_WRITE, MAP_PRIVATE, stream->fd, 0);
+ if (data == MAP_FAILED)
+ eprintf("mmap %s:", stream->file);
if (headlen != stream->headlen)
memmove(data + headlen, data + stream->headlen, length);
memcpy(data, head, (size_t)headlen);