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Diffstat (limited to 'contrib/qemu/include/qemu/iov.h')
| -rw-r--r-- | contrib/qemu/include/qemu/iov.h | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/contrib/qemu/include/qemu/iov.h b/contrib/qemu/include/qemu/iov.h deleted file mode 100644 index 68d25f29b76..00000000000 --- a/contrib/qemu/include/qemu/iov.h +++ /dev/null @@ -1,115 +0,0 @@ -/* - * 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); - -/* - * 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 |