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Bernd Schubert
a32cec008c
Examples help to understand what needs to be done for ioctls. Signed-off-by: Bernd Schubert <bernd@bsbernd.com>
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
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FUSE-ioctl: ioctl support for FUSE
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Copyright (C) 2008 SUSE Linux Products GmbH
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Copyright (C) 2008 Tejun Heo <teheo@suse.de>
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This program can be distributed under the terms of the GNU GPLv2.
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See the file GPL2.txt.
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*/
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/** @file
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* @tableofcontents
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*
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* Header file to share definitions between the ioctl example file
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* systems (ioctl.c, ioctl_ll.c, cuse.c) and their test programs
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* (ioctl_client.c, ioctl_ll_client.c, cuse_client.c).
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*
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* Restricted ioctls (FIOC_GET_SIZE, FIOC_SET_SIZE):
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* Use _IOR/_IOW encoding - kernel handles data transfer automatically.
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*
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* Unrestricted ioctls (FIOC_READ, FIOC_WRITE):
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* Use _IO encoding - require fuse_reply_ioctl_retry() in low-level API.
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* Only work with CUSE (fuse kernel restriction).
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*
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* \include ioctl.h
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*/
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/ioctl.h>
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enum {
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FIOC_GET_SIZE = _IOR('E', 0, size_t),
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FIOC_SET_SIZE = _IOW('E', 1, size_t),
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/*
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* The following two ioctls don't follow usual encoding rules
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* and transfer variable amount of data.
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*/
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FIOC_READ = _IO('E', 2),
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FIOC_WRITE = _IO('E', 3),
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};
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struct fioc_rw_arg {
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off_t offset;
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void *buf;
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size_t size;
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size_t prev_size; /* out param for previous total size */
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size_t new_size; /* out param for new total size */
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};
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