1 /* User-registered handlers for specific `ioctl' requests. 2 Copyright (C) 1993-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _HURD_IOCTL_H 20 #define _HURD_IOCTL_H 1 21 22 #define __need___va_list 23 #include <stdarg.h> 24 #include <bits/ioctls.h> 25 #include <mach/port.h> 26 27 28 /* Type of handler function, called like ioctl to do its entire job. */ 29 typedef int (*ioctl_handler_t) (int fd, int request, void *arg); 30 31 /* Structure that records an ioctl handler. */ 32 struct ioctl_handler 33 { 34 /* Range of handled _IOC_NOTYPE (REQUEST) values. */ 35 int first_request, last_request; 36 37 /* Handler function, called like ioctl to do its entire job. */ 38 ioctl_handler_t handler; 39 40 struct ioctl_handler *next; /* Next handler. */ 41 }; 42 43 44 /* Register HANDLER to handle ioctls with REQUEST values between 45 FIRST_REQUEST and LAST_REQUEST inclusive. Returns zero if successful. 46 Return nonzero and sets `errno' for an error. */ 47 48 extern int hurd_register_ioctl_handler (int first_request, int last_request, 49 ioctl_handler_t handler); 50 51 52 /* Define a library-internal handler for ioctl commands between FIRST and 53 LAST inclusive. The last element gratuitously references HANDLER to 54 avoid `defined but not used' warnings. */ 55 56 #define _HURD_HANDLE_IOCTLS_1(handler, first, last, moniker) \ 57 static const struct ioctl_handler handler##_ioctl_handler##moniker \ 58 __attribute__ ((__unused__)) = \ 59 { _IOC_NOTYPE (first), _IOC_NOTYPE (last), \ 60 (ioctl_handler_t) (handler), NULL }; \ 61 text_set_element (_hurd_ioctl_handler_lists, \ 62 handler##_ioctl_handler##moniker) 63 #define _HURD_HANDLE_IOCTLS(handler, first, last) \ 64 _HURD_HANDLE_IOCTLS_1 (handler, first, last, first##_to_##last) 65 66 /* Define a library-internal handler for a single ioctl command. */ 67 68 #define _HURD_HANDLE_IOCTL(handler, ioctl) \ 69 _HURD_HANDLE_IOCTLS_1 (handler, ioctl, ioctl, ioctl##_only) 70 71 72 /* Install a new CTTYID port, atomically updating the dtable appropriately. 73 This consumes the send right passed in. */ 74 75 void _hurd_locked_install_cttyid (mach_port_t cttyid); 76 77 /* Lookup the handler for the given ioctl request. */ 78 79 ioctl_handler_t _hurd_lookup_ioctl_handler (int request); 80 81 82 #endif /* hurd/ioctl.h */ 83