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The CUSE library is a wrapper for the devfs kernel functionality which is exposed through /dev/cuse . In order to function the CUSE kernel code must either be enabled in the kernel configuration file or loaded separately as a module. Currently none of the committed items are connected to the default builds, except for installing the needed header files. The CUSE code will be connected to the default world and kernel builds in a follow-up commit. The CUSE module was written by Hans Petter Selasky, somewhat inspired by similar functionality found in FUSE. The CUSE library can be used for many purposes. Currently CUSE is used when running Linux kernel drivers in user-space, which need to create a character device node to communicate with its applications. CUSE has full support for almost all devfs functionality found in the kernel: - kevents - read - write - ioctl - poll - open - close - mmap - private per file handle data Requested by several people. Also see "multimedia/cuse4bsd-kmod" in ports.
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/* $FreeBSD$ */
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/*-
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* Copyright (c) 2010-2012 Hans Petter Selasky. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _CUSE_DEFS_H_
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#define _CUSE_DEFS_H_
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#define CUSE_VERSION 0x000122
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#define CUSE_ERR_NONE 0
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#define CUSE_ERR_BUSY -1
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#define CUSE_ERR_WOULDBLOCK -2
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#define CUSE_ERR_INVALID -3
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#define CUSE_ERR_NO_MEMORY -4
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#define CUSE_ERR_FAULT -5
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#define CUSE_ERR_SIGNAL -6
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#define CUSE_ERR_OTHER -7
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#define CUSE_ERR_NOT_LOADED -8
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#define CUSE_POLL_NONE 0
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#define CUSE_POLL_READ 1
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#define CUSE_POLL_WRITE 2
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#define CUSE_POLL_ERROR 4
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#define CUSE_FFLAG_NONE 0
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#define CUSE_FFLAG_READ 1
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#define CUSE_FFLAG_WRITE 2
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#define CUSE_FFLAG_NONBLOCK 4
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#define CUSE_DBG_NONE 0
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#define CUSE_DBG_FULL 1
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/* maximum data transfer length */
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#define CUSE_LENGTH_MAX 0x7FFFFFFFU
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enum {
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CUSE_CMD_NONE,
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CUSE_CMD_OPEN,
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CUSE_CMD_CLOSE,
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CUSE_CMD_READ,
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CUSE_CMD_WRITE,
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CUSE_CMD_IOCTL,
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CUSE_CMD_POLL,
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CUSE_CMD_SIGNAL,
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CUSE_CMD_SYNC,
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CUSE_CMD_MAX,
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};
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#define CUSE_MAKE_ID(a,b,c,u) ((((a) & 0x7F) << 24)| \
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(((b) & 0xFF) << 16)|(((c) & 0xFF) << 8)|((u) & 0xFF))
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#define CUSE_ID_MASK 0x7FFFFF00U
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/*
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* The following ID's are defined:
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* ===============================
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*/
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#define CUSE_ID_DEFAULT(what) CUSE_MAKE_ID(0,0,what,0)
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#define CUSE_ID_WEBCAMD(what) CUSE_MAKE_ID('W','C',what,0) /* Used by Webcamd. */
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#define CUSE_ID_SUNDTEK(what) CUSE_MAKE_ID('S','K',what,0) /* Used by Sundtek. */
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#define CUSE_ID_CX88(what) CUSE_MAKE_ID('C','X',what,0) /* Used by cx88 driver. */
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#define CUSE_ID_UHIDD(what) CUSE_MAKE_ID('U','D',what,0) /* Used by uhidd. */
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#endif /* _CUSE_DEFS_H_ */
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