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authorStefan Hajnoczi <stefanha@redhat.com>2012-11-21 17:41:10 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-01-02 15:58:05 +0100
commitd02776350d9c76348988fc9e58a64a4f6b1a9f61 (patch)
tree16aca1151bf5e3658b60181c68dd07e7f537a49b /include/qemu
parent3e9ec521711ed033476098cfc7f23c992cc606a2 (diff)
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iov: add iov_discard_front/back() to remove data
The iov_discard_front/back() functions remove data from the front or back of the vector. This is useful when peeling off header/footer structs. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/qemu')
-rw-r--r--include/qemu/iov.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/qemu/iov.h b/include/qemu/iov.h
index d06f8b9..68d25f2 100644
--- a/include/qemu/iov.h
+++ b/include/qemu/iov.h
@@ -99,4 +99,17 @@ unsigned iov_copy(struct iovec *dst_iov, unsigned int dst_iov_cnt,
const struct iovec *iov, unsigned int iov_cnt,
size_t offset, size_t bytes);
+/*
+ * Remove a given number of bytes from the front or back of a vector.
+ * This may update iov and/or iov_cnt to exclude iovec elements that are
+ * no longer required.
+ *
+ * The number of bytes actually discarded is returned. This number may be
+ * smaller than requested if the vector is too small.
+ */
+size_t iov_discard_front(struct iovec **iov, unsigned int *iov_cnt,
+ size_t bytes);
+size_t iov_discard_back(struct iovec *iov, unsigned int *iov_cnt,
+ size_t bytes);
+
#endif