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[glibc.git] / hurd / hurdioctl.c
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1 /* ioctl commands which must be done in the C library.
2 Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <hurd.h>
21 #include <hurd/fd.h>
22 #include <sys/ioctl.h>
23 #include <hurd/ioctl.h>
27 /* Symbol set of ioctl handler lists. If there are user-registered
28 handlers, one of these lists will contain them. The other lists are
29 handlers built into the library. */
30 symbol_set_define (_hurd_ioctl_handler_lists)
32 /* Look up REQUEST in the set of handlers. */
33 ioctl_handler_t
34 _hurd_lookup_ioctl_handler (int request)
36 void *const *ptr;
37 const struct ioctl_handler *h;
39 /* Mask off the type bits, so that we see requests in a single group as a
40 contiguous block of values. */
41 request = _IOC_NOTYPE (request);
43 for (ptr = symbol_set_first_element (_hurd_ioctl_handler_lists);
44 !symbol_set_end_p (_hurd_ioctl_handler_lists, ptr);
45 ++ptr)
46 for (h = *ptr; h != NULL; h = h->next)
47 if (request >= h->first_request && request <= h->last_request)
48 return h->handler;
50 return NULL;
53 #include <fcntl.h>
55 /* Find out how many bytes may be read from FD without blocking. */
57 static int
58 fioctl (int fd,
59 int request,
60 int *arg)
62 error_t err;
64 *(volatile int *) arg = *arg;
66 switch (request)
68 default:
69 err = ENOTTY;
70 break;
72 case FIONREAD:
74 mach_msg_type_number_t navail;
75 err = HURD_DPORT_USE (fd, __io_readable (port, &navail));
76 if (!err)
77 *arg = (int) navail;
79 break;
81 case FIONBIO:
82 err = HURD_DPORT_USE (fd, (*arg ?
83 __io_set_some_openmodes :
84 __io_clear_some_openmodes)
85 (port, O_NONBLOCK));
86 break;
88 case FIOASYNC:
89 err = HURD_DPORT_USE (fd, (*arg ?
90 __io_set_some_openmodes :
91 __io_clear_some_openmodes)
92 (port, O_ASYNC));
93 break;
95 case FIOSETOWN:
96 err = HURD_DPORT_USE (fd, __io_mod_owner (port, *arg));
97 break;
99 case FIOGETOWN:
100 err = HURD_DPORT_USE (fd, __io_get_owner (port, arg));
101 break;
104 return err ? __hurd_dfail (fd, err) : 0;
107 _HURD_HANDLE_IOCTLS (fioctl, FIOGETOWN, FIONREAD);
110 static int
111 fioclex (int fd,
112 int request)
114 int flag;
116 switch (request)
118 default:
119 return __hurd_fail (ENOTTY);
120 case FIOCLEX:
121 flag = FD_CLOEXEC;
122 break;
123 case FIONCLEX:
124 flag = 0;
125 break;
128 return __fcntl (fd, F_SETFD, flag);
130 _HURD_HANDLE_IOCTLS (fioclex, FIOCLEX, FIONCLEX);
132 #include <hurd/term.h>
133 #include <hurd/tioctl.h>
135 static void
136 rectty_dtable (mach_port_t cttyid)
138 int i;
140 HURD_CRITICAL_BEGIN;
141 __mutex_lock (&_hurd_dtable_lock);
143 for (i = 0; i < _hurd_dtablesize; ++i)
145 struct hurd_fd *const d = _hurd_dtable[i];
146 mach_port_t newctty;
148 if (d == NULL)
149 /* Nothing to do for an unused descriptor cell. */
150 continue;
152 if (cttyid == MACH_PORT_NULL)
153 /* We now have no controlling tty at all. */
154 newctty = MACH_PORT_NULL;
155 else
156 HURD_PORT_USE (&d->port,
157 ({ mach_port_t id;
158 /* Get the io object's cttyid port. */
159 if (! __term_getctty (port, &id))
161 if (id == cttyid && /* Is it ours? */
162 /* Get the ctty io port. */
163 __term_open_ctty (port,
164 _hurd_pid, _hurd_pgrp,
165 &newctty))
166 /* XXX it is our ctty but the call failed? */
167 newctty = MACH_PORT_NULL;
168 __mach_port_deallocate
169 (__mach_task_self (), (mach_port_t) id);
171 else
172 newctty = MACH_PORT_NULL;
174 }));
176 /* Install the new ctty port. */
177 _hurd_port_set (&d->ctty, newctty);
180 __mutex_unlock (&_hurd_dtable_lock);
181 HURD_CRITICAL_END;
185 /* Called when we have received a message saying to use a new ctty ID port. */
187 error_t
188 _hurd_setcttyid (mach_port_t cttyid)
190 error_t err;
192 if (cttyid != MACH_PORT_NULL)
194 /* Give the new send right a user reference.
195 This is a good way to check that it is valid. */
196 if (err = __mach_port_mod_refs (__mach_task_self (), cttyid,
197 MACH_PORT_RIGHT_SEND, 1))
198 return err;
201 /* Install the port, consuming the reference we just created. */
202 _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], cttyid);
204 /* Reset all the ctty ports in all the descriptors. */
205 __USEPORT (CTTYID, (rectty_dtable (cttyid), 0));
207 return 0;
211 /* Make FD be the controlling terminal.
212 This function is called for `ioctl (fd, TCIOSCTTY)'. */
214 static int
215 tiocsctty (int fd,
216 int request) /* Always TIOCSCTTY. */
218 mach_port_t cttyid;
219 error_t err;
221 /* Get FD's cttyid port, unless it is already ours. */
222 err = HURD_DPORT_USE (fd, ctty != MACH_PORT_NULL ? EADDRINUSE :
223 __term_getctty (port, &cttyid));
224 if (err == EADDRINUSE)
225 /* FD is already the ctty. Nothing to do. */
226 return 0;
227 else if (err)
228 return __hurd_fail (err);
230 /* Change the terminal's pgrp to ours. */
231 err = HURD_DPORT_USE (fd, __tioctl_tiocspgrp (port, _hurd_pgrp));
232 if (err)
233 return __hurd_fail (err);
235 /* Make it our own. */
236 _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], cttyid);
238 /* Reset all the ctty ports in all the descriptors. */
239 __USEPORT (CTTYID, (rectty_dtable (cttyid), 0));
241 return 0;
243 _HURD_HANDLE_IOCTL (tiocsctty, TIOCSCTTY);
245 /* Dissociate from the controlling terminal. */
247 static int
248 tiocnotty (int fd,
249 int request) /* Always TIOCNOTTY. */
251 mach_port_t fd_cttyid;
252 error_t err;
254 if (err = HURD_DPORT_USE (fd, __term_getctty (port, &fd_cttyid)))
255 return __hurd_fail (err);
257 if (__USEPORT (CTTYID, port != fd_cttyid))
258 err = EINVAL;
260 __mach_port_deallocate (__mach_task_self (), fd_cttyid);
262 if (err)
263 return __hurd_fail (err);
265 /* Clear our cttyid port cell. */
266 _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], MACH_PORT_NULL);
268 /* Reset all the ctty ports in all the descriptors. */
270 __USEPORT (CTTYID, (rectty_dtable (MACH_PORT_NULL), 0));
272 return 0;
274 _HURD_HANDLE_IOCTL (tiocnotty, TIOCNOTTY);