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author | Stefan Hajnoczi <stefanha@redhat.com> | 2012-11-21 17:41:10 +0100 |
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committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-01-02 15:58:05 +0100 |
commit | d02776350d9c76348988fc9e58a64a4f6b1a9f61 (patch) | |
tree | 16aca1151bf5e3658b60181c68dd07e7f537a49b /include/qemu/iov.h | |
parent | 3e9ec521711ed033476098cfc7f23c992cc606a2 (diff) | |
download | hqemu-d02776350d9c76348988fc9e58a64a4f6b1a9f61.zip hqemu-d02776350d9c76348988fc9e58a64a4f6b1a9f61.tar.gz |
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/iov.h')
-rw-r--r-- | include/qemu/iov.h | 13 |
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 |