66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/*
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* The Qubes OS Project, http://www.qubes-os.org
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*
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* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <stdint.h>
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#include <xenctrl.h>
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typedef uint32_t VCHAN_RING_IDX;
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/// struct vchan_interface is placed in memory shared between domains
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struct vchan_interface {
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// One buffer for each data direction
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char buf_in[1024];
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char buf_out[2048];
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// standard consumer/producer interface, one pair per buffer
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VCHAN_RING_IDX cons_in, prod_in, cons_out, prod_out;
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uint32_t debug;
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int client_closed, server_closed;
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};
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/// struct libvchan is a control structure, passed to all library calls
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struct libvchan {
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struct vchan_interface *ring;
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uint32_t ring_ref;
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/// descriptor to event channel interface
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#ifdef XENCTRL_HAS_XC_INTERFACE
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xc_evtchn *evfd;
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#else
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int evfd;
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#endif
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int evport;
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VCHAN_RING_IDX *wr_cons, *wr_prod, *rd_cons, *rd_prod;
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char *rd_ring, *wr_ring;
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int rd_ring_size, wr_ring_size;
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int is_server;
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};
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struct libvchan *libvchan_server_init(int devno);
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struct libvchan *libvchan_client_init(int domain, int devno);
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int libvchan_write(struct libvchan *ctrl, char *data, int size);
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int libvchan_read(struct libvchan *ctrl, char *data, int size);
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int libvchan_wait(struct libvchan *ctrl);
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int libvchan_close(struct libvchan *ctrl);
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void libvchan_prepare_to_select(struct libvchan *ctrl);
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int libvchan_fd_for_select(struct libvchan *ctrl);
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int libvchan_is_eof(struct libvchan *ctrl);
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int libvchan_data_ready(struct libvchan *ctrl);
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int libvchan_buffer_space(struct libvchan *ctrl);
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