129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/*
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* uhub - A tiny ADC p2p connection hub
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* Copyright (C) 2007-2012, Jan Vidar Krey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef HAVE_UHUB_IO_QUEUE_H
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#define HAVE_UHUB_IO_QUEUE_H
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struct adc_message;
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struct linked_list;
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typedef int (*ioq_write)(void* desc, const void* buf, size_t len);
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typedef int (*ioq_read)(void* desc, void* buf, size_t len);
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struct ioq_send
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{
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size_t size; /** Size of send queue (in bytes, not messages) */
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size_t offset; /** Queue byte offset in the first message. Should be 0 unless a partial write. */
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#ifdef SSL_SUPPORT
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size_t last_send; /** When using SSL, one have to send the exact same buffer and length if a write cannot complete. */
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#endif
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struct linked_list* queue; /** List of queued messages (struct adc_message) */
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};
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struct ioq_recv
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{
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char* buf;
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size_t size;
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// int flags;
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};
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/**
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* Create a send queue
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*/
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extern struct ioq_send* ioq_send_create();
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/**
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* Destroy a send queue, and delete any queued messages.
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*/
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extern void ioq_send_destroy(struct ioq_send*);
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/**
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* Add a message to the send queue.
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*/
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extern void ioq_send_add(struct ioq_send*, struct adc_message* msg);
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/**
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* Process the send queue, and send as many messages as possible.
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* @returns -1 on error, 0 if unable to send more, 1 if more can be sent.
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*/
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extern int ioq_send_send(struct ioq_send*, struct net_connection* con);
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/**
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* @returns 1 if send queue is empty, 0 otherwise.
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*/
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extern int ioq_send_is_empty(struct ioq_send*);
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/**
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* @returns the number of bytes remaining to be sent in the queue.
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*/
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extern size_t ioq_send_get_bytes(struct ioq_send*);
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/**
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* Create a receive queue.
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*/
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extern struct ioq_recv* ioq_recv_create();
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/**
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* Destroy a receive queue.
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*/
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extern void ioq_recv_destroy(struct ioq_recv*);
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/**
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* Gets the buffer, copies it into buf and deallocates it.
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* NOTE: bufsize *MUST* be larger than the buffer, otherwise it asserts.
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* @return the number of bytes copied into buf.
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*/
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extern size_t ioq_recv_get(struct ioq_recv*, void* buf, size_t bufsize);
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/**
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* Sets the buffer
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*/
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extern size_t ioq_recv_set(struct ioq_recv*, void* buf, size_t bufsize);
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/**
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* @return 1 if size is zero, 0 otherwise.
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*/
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extern int ioq_recv_is_empty(struct ioq_recv* buf);
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enum ioq_recv_status
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{
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ioq_recv_ok = 0, // read data OK
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ioq_recv_later = 1, // all OK, but call again later (no change)
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ioq_recv_full = 2, // all OK, but the buffer is full
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ioq_recv_error = 3, // error (connection is not working)
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};
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/**
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* Receive from connection into buffer.
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*/
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extern enum ioq_recv_status ioq_recv_read(struct ioq_recv* q, struct net_connection* con);
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/**
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* Consume 'bytes' bytes.
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* 'bytes' must be <= q->size
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*
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* @return 1 on success, or 0 on error (only if q == NULL or bytes is > q->size).
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*/
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extern int ioq_recv_consume(struct ioq_recv* q, size_t bytes);
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#endif /* HAVE_UHUB_IO_QUEUE_H */
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