Ben Pfaff
903d0940fb
Now it helps clients track the number of in-flight messages, but lets the clients do the limiting themselves. This will come in handy for packet-in rate limiting (in an upcoming commit), in which we want to track in-flight packet-in messages separately from other in-flight messages.
88 lines
3.6 KiB
C
88 lines
3.6 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#ifndef BUFFER_H
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#define BUFFER_H 1
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#include <stddef.h>
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/* Buffer for holding arbitrary data. A buffer is automatically reallocated as
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* necessary if it grows too large for the available memory. */
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struct buffer {
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void *base; /* First byte of area malloc()'d area. */
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size_t allocated; /* Number of bytes allocated. */
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void *data; /* First byte actually in use. */
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size_t size; /* Number of bytes in use. */
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void *l2; /* Link-level header. */
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void *l3; /* Network-level header. */
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void *l4; /* Transport-level header. */
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void *l7; /* Application data. */
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struct buffer *next; /* Next in a list of buffers. */
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void *private; /* Private pointer for use by owner. */
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};
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void buffer_use(struct buffer *, void *, size_t);
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void buffer_init(struct buffer *, size_t);
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void buffer_uninit(struct buffer *);
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void buffer_reinit(struct buffer *, size_t);
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struct buffer *buffer_new(size_t);
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struct buffer *buffer_clone(const struct buffer *);
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void buffer_delete(struct buffer *);
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void *buffer_at(const struct buffer *, size_t offset, size_t size);
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void *buffer_at_assert(const struct buffer *, size_t offset, size_t size);
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void *buffer_tail(const struct buffer *);
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void *buffer_end(const struct buffer *);
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void *buffer_put_uninit(struct buffer *, size_t);
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void *buffer_put(struct buffer *, const void *, size_t);
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void buffer_reserve(struct buffer *, size_t);
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void *buffer_push_uninit(struct buffer *b, size_t);
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void *buffer_push(struct buffer *b, const void *, size_t);
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size_t buffer_headroom(struct buffer *);
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size_t buffer_tailroom(struct buffer *);
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void buffer_prealloc_headroom(struct buffer *, size_t);
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void buffer_prealloc_tailroom(struct buffer *, size_t);
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void buffer_clear(struct buffer *);
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void *buffer_pull(struct buffer *, size_t);
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void *buffer_try_pull(struct buffer *, size_t);
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#endif /* buffer.h */
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