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authorPaolo Bonzini <pbonzini@redhat.com>2012-12-17 18:20:00 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2012-12-19 08:32:39 +0100
commit1de7afc984b49af164e2619e6850b9732b173b34 (patch)
tree60cd16f527440fcfcdb81d9bea1af5d9147604c4 /iov.h
parent14cccb618508a0aa70eb9ccf366703a019a45ff0 (diff)
downloadhqemu-1de7afc984b49af164e2619e6850b9732b173b34.zip
hqemu-1de7afc984b49af164e2619e6850b9732b173b34.tar.gz
misc: move include files to include/qemu/
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'iov.h')
-rw-r--r--iov.h102
1 files changed, 0 insertions, 102 deletions
diff --git a/iov.h b/iov.h
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-/*
- * Helpers for using (partial) iovecs.
- *
- * Copyright (C) 2010 Red Hat, Inc.
- *
- * Author(s):
- * Amit Shah <amit.shah@redhat.com>
- * Michael Tokarev <mjt@tls.msk.ru>
- *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
- */
-
-#ifndef IOV_H
-#define IOV_H
-
-#include "qemu-common.h"
-
-/**
- * count and return data size, in bytes, of an iovec
- * starting at `iov' of `iov_cnt' number of elements.
- */
-size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt);
-
-/**
- * Copy from single continuous buffer to scatter-gather vector of buffers
- * (iovec) and back like memcpy() between two continuous memory regions.
- * Data in single continuous buffer starting at address `buf' and
- * `bytes' bytes long will be copied to/from an iovec `iov' with
- * `iov_cnt' number of elements, starting at byte position `offset'
- * within the iovec. If the iovec does not contain enough space,
- * only part of data will be copied, up to the end of the iovec.
- * Number of bytes actually copied will be returned, which is
- * min(bytes, iov_size(iov)-offset)
- * `Offset' must point to the inside of iovec.
- * It is okay to use very large value for `bytes' since we're
- * limited by the size of the iovec anyway, provided that the
- * buffer pointed to by buf has enough space. One possible
- * such "large" value is -1 (sinice size_t is unsigned),
- * so specifying `-1' as `bytes' means 'up to the end of iovec'.
- */
-size_t iov_from_buf(const struct iovec *iov, unsigned int iov_cnt,
- size_t offset, const void *buf, size_t bytes);
-size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
- size_t offset, void *buf, size_t bytes);
-
-/**
- * Set data bytes pointed out by iovec `iov' of size `iov_cnt' elements,
- * starting at byte offset `start', to value `fillc', repeating it
- * `bytes' number of times. `Offset' must point to the inside of iovec.
- * If `bytes' is large enough, only last bytes portion of iovec,
- * up to the end of it, will be filled with the specified value.
- * Function return actual number of bytes processed, which is
- * min(size, iov_size(iov) - offset).
- * Again, it is okay to use large value for `bytes' to mean "up to the end".
- */
-size_t iov_memset(const struct iovec *iov, const unsigned int iov_cnt,
- size_t offset, int fillc, size_t bytes);
-
-/*
- * Send/recv data from/to iovec buffers directly
- *
- * `offset' bytes in the beginning of iovec buffer are skipped and
- * next `bytes' bytes are used, which must be within data of iovec.
- *
- * r = iov_send_recv(sockfd, iov, iovcnt, offset, bytes, true);
- *
- * is logically equivalent to
- *
- * char *buf = malloc(bytes);
- * iov_to_buf(iov, iovcnt, offset, buf, bytes);
- * r = send(sockfd, buf, bytes, 0);
- * free(buf);
- *
- * For iov_send_recv() _whole_ area being sent or received
- * should be within the iovec, not only beginning of it.
- */
-ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt,
- size_t offset, size_t bytes, bool do_send);
-#define iov_recv(sockfd, iov, iov_cnt, offset, bytes) \
- iov_send_recv(sockfd, iov, iov_cnt, offset, bytes, false)
-#define iov_send(sockfd, iov, iov_cnt, offset, bytes) \
- iov_send_recv(sockfd, iov, iov_cnt, offset, bytes, true)
-
-/**
- * Produce a text hexdump of iovec `iov' with `iov_cnt' number of elements
- * in file `fp', prefixing each line with `prefix' and processing not more
- * than `limit' data bytes.
- */
-void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt,
- FILE *fp, const char *prefix, size_t limit);
-
-/*
- * Partial copy of vector from iov to dst_iov (data is not copied).
- * dst_iov overlaps iov at a specified offset.
- * size of dst_iov is at most bytes. dst vector count is returned.
- */
-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);
-
-#endif
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