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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.
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/* $FreeBSD$ */
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/*-
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* Copyright (c) 2014 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_H_
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#define _CUSE_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <fs/cuse/cuse_defs.h>
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struct cuse_dev;
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typedef int (cuse_open_t)(struct cuse_dev *, int fflags);
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typedef int (cuse_close_t)(struct cuse_dev *, int fflags);
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typedef int (cuse_read_t)(struct cuse_dev *, int fflags, void *user_ptr, int len);
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typedef int (cuse_write_t)(struct cuse_dev *, int fflags, const void *user_ptr, int len);
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typedef int (cuse_ioctl_t)(struct cuse_dev *, int fflags, unsigned long cmd, void *user_data);
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typedef int (cuse_poll_t)(struct cuse_dev *, int fflags, int events);
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struct cuse_methods {
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cuse_open_t *cm_open;
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cuse_close_t *cm_close;
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cuse_read_t *cm_read;
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cuse_write_t *cm_write;
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cuse_ioctl_t *cm_ioctl;
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cuse_poll_t *cm_poll;
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};
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int cuse_init(void);
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int cuse_uninit(void);
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void *cuse_vmalloc(int);
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int cuse_is_vmalloc_addr(void *);
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void cuse_vmfree(void *);
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unsigned long cuse_vmoffset(void *ptr);
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int cuse_alloc_unit_number_by_id(int *, int);
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int cuse_free_unit_number_by_id(int, int);
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int cuse_alloc_unit_number(int *);
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int cuse_free_unit_number(int);
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struct cuse_dev *cuse_dev_create(const struct cuse_methods *, void *, void *, uid_t, gid_t, int, const char *,...);
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void cuse_dev_destroy(struct cuse_dev *);
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void *cuse_dev_get_priv0(struct cuse_dev *);
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void *cuse_dev_get_priv1(struct cuse_dev *);
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void cuse_dev_set_priv0(struct cuse_dev *, void *);
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void cuse_dev_set_priv1(struct cuse_dev *, void *);
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void cuse_set_local(int);
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int cuse_get_local(void);
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int cuse_wait_and_process(void);
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void cuse_dev_set_per_file_handle(struct cuse_dev *, void *);
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void *cuse_dev_get_per_file_handle(struct cuse_dev *);
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int cuse_copy_out(const void *src, void *user_dst, int len);
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int cuse_copy_in(const void *user_src, void *dst, int len);
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int cuse_got_peer_signal(void);
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void cuse_poll_wakeup(void);
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struct cuse_dev *cuse_dev_get_current(int *);
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extern int cuse_debug_level;
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CUSE_H_ */
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