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/* User-registered handlers for specific `ioctl' requests.
Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#ifndef _HURD_IOCTL_H
#define _HURD_IOCTL_H 1
#define __need___va_list
#include <stdarg.h>
/* Type of handler function, called like ioctl to do its entire job. */
typedef int (*ioctl_handler_t) (int fd, int request, void *arg);
/* Structure that records an ioctl handler. */
struct ioctl_handler
{
int first_request, last_request; /* Range of handled request values. */
/* Handler function, called like ioctl to do its entire job. */
ioctl_handler_t handler;
struct ioctl_handler *next; /* Next handler. */
};
/* Register HANDLER to handle ioctls with REQUEST values between
FIRST_REQUEST and LAST_REQUEST inclusive. Returns zero if successful.
Return nonzero and sets `errno' for an error. */
extern int hurd_register_ioctl_handler (int first_request, int last_request,
ioctl_handler_t handler);
/* Define a library-internal handler for ioctl commands between FIRST and
LAST inclusive. The last element gratuitously references HANDLER to
avoid `defined but not used' warnings. */
#define _HURD_HANDLE_IOCTLS(handler, first, last) \
static const struct ioctl_handler handler##_ioctl_handler = \
{ (first), (last), (int (*) (int, int, void *)) (handler), \
(&(handler), &(handler##_ioctl_handler), NULL) }; \
text_set_element (_hurd_ioctl_handler_lists, ##handler##_ioctl_handler)
/* Define a library-internal handler for a single ioctl command. */
#define _HURD_HANDLE_IOCTL(handler, ioctl) \
_HURD_HANDLE_IOCTLS (handler, (ioctl), (ioctl))
/* Lookup the handler for the given ioctl request. */
ioctl_handler_t _hurd_lookup_ioctl_handler (int request);
#endif /* hurd/ioctl.h */
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