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- /* Copyright (C) 1992, 1993, 1994 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. */
-
- #include <ansidecl.h>
- #include <errno.h>
- #include <sys/ioctl.h>
- #include <hurd.h>
- #include <hurd/fd.h>
- #include <stdarg.h>
- #include <mach/notify.h>
- #include <assert.h>
-
- /* Symbol set of ioctl handler lists. If there are user-registered
- handlers, one of these lists will contain them. The other lists are
- handlers built into the library. The definition of the set comes from
- hurdioctl.c. */
- extern const struct
- {
- size_t n;
- struct ioctl_handler *v[0];
- } _hurd_ioctl_handler_lists;
-
-
- /* Perform the I/O control operation specified by REQUEST on FD.
- The actual type and use of ARG and the return value depend on REQUEST. */
- int
- DEFUN(__ioctl, (fd, request),
- int fd AND unsigned long int request DOTS)
- {
- /* Map individual type fields to Mach IPC types. */
- static const int mach_types[] =
- { MACH_MSG_TYPE_CHAR, MACH_MSG_TYPE_INTEGER_16, MACH_MSG_TYPE_INTEGER_32,
- -1 };
-
- /* Extract the type information encoded in the request. */
- unsigned int type = _IOC_TYPE (request);
-
- /* Message buffer. */
- struct
- {
- mig_reply_header_t header;
- char data[_IOT_COUNT0 (type) * (_IOT_TYPE0 (request) << 1) +
- _IOT_COUNT1 (type) * (_IOT_TYPE1 (request) << 1) +
- _IOT_COUNT2 (type) * (_IOT_TYPE2 (request) << 1)];
- } msg;
- mach_msg_header_t *const m = &msg.header.Head;
- mach_msg_type_t *t = (mach_msg_type_t *) msg.data;
- mach_msg_id_t msgid;
- unsigned int reply_size;
-
- void *arg;
-
- error_t err;
-
- #define io2mach_type(count, type) \
- ((mach_msg_type_t) { mach_types[type], (type << 1) * 8, count, 1, 0, 0 })
-
- /* Pack an argument into the message buffer. */
- inline void in (unsigned int count, enum __ioctl_datum type)
- {
- if (count > 0)
- {
- void *const p = &t[1];
- const size_t len = count * ((unsigned int) type << 1);
- *t = io2mach_type (count, type);
- memcpy (p, arg, len);
- arg += len;
- t = p + ((len + sizeof (*t) - 1) / sizeof (*t) * sizeof (*t));
- }
- }
-
- /* Unpack the message buffer into the argument location. */
- inline int out (unsigned int count, unsigned int type,
- void *store, void **update)
- {
- if (count > 0)
- {
- const size_t len = count * (type << 1);
- union { mach_msg_type_t t; int i; } ipctype;
- ipctype.t = io2mach_type (count, type);
- if (*(int *) t != ipctype.i)
- return 1;
- ++t;
- memcpy (store, t, len);
- if (update != NULL)
- *update += len;
- t = (void *) t + ((len + sizeof (*t) - 1) / sizeof (*t) * sizeof *t);
- }
- return 0;
- }
-
- va_list ap;
-
- va_start (ap, request);
- arg = va_arg (ap, void *);
- va_end (ap);
-
- {
- /* Check for a registered handler for REQUEST. */
-
- size_t i;
- const struct ioctl_handler *h;
-
- for (i = 0; i < _hurd_ioctl_handler_lists.n; ++i)
- for (h = _hurd_ioctl_handler_lists.v[i]; h != NULL; h = h->next)
- if (request >= h->first_request && request <= h->last_request)
- /* This handler groks REQUEST. Se lo puntamonos. */
- return (*h->handler) (fd, request, arg);
- }
-
- /* Compute the Mach message ID for the RPC from the group and command
- parts of the ioctl request. */
- msgid = (100000 +
- ((_IOC_GROUP (request) - 'f') * 4000) + _IOC_COMMAND (request));
-
- if (_IOC_INOUT (request) & IOC_IN)
- {
- /* Pack the argument data. */
- in (_IOT_COUNT0 (type), _IOT_TYPE0 (type));
- in (_IOT_COUNT1 (type), _IOT_TYPE1 (type));
- in (_IOT_COUNT2 (type), _IOT_TYPE2 (type));
- }
-
- /* Compute the expected size of the reply. There is a standard header
- consisting of the message header and the reply code. Then, for out
- and in/out ioctls, there come the data with their type headers. */
- reply_size = sizeof (mig_reply_header_t);
-
- if (_IOC_INOUT (request) & IOC_OUT)
- {
- inline void figure_reply (unsigned int count, enum __ioctl_datum type)
- {
- if (count > 0)
- {
- /* Add the size of the type and data. */
- reply_size += sizeof (mach_msg_type_t) + (type << 1) * count;
- /* Align it to word size. */
- reply_size += sizeof (mach_msg_type_t) - 1;
- reply_size &= ~(sizeof (mach_msg_type_t) - 1);
- }
- }
- figure_reply (_IOT_COUNT0 (request), _IOT_TYPE0 (request));
- figure_reply (_IOT_COUNT1 (request), _IOT_TYPE1 (request));
- figure_reply (_IOT_COUNT2 (request), _IOT_TYPE2 (request));
- }
-
- /* Send the RPC. */
-
- err = HURD_DPORT_USE
- (fd,
- ({
- m->msgh_size = (char *) t - (char *) &msg;
- m->msgh_remote_port = port;
- m->msgh_local_port = __mig_get_reply_port ();
- m->msgh_seqno = 0;
- m->msgh_id = msgid;
- m->msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND,
- MACH_MSG_TYPE_MAKE_SEND_ONCE);
- #ifdef notyet
- HURD_EINTR_RPC (port, __mach_msg (m, MACH_SEND_MSG|MACH_RCV_MSG,
- m->msgh_size, sizeof (msg),
- m->msgh_local_port,
- MACH_MSG_TIMEOUT_NONE,
- MACH_PORT_NULL));
- #else
- __mach_msg (m, MACH_SEND_MSG|MACH_RCV_MSG, m->msgh_size, sizeof (msg),
- m->msgh_local_port, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
- #endif
- }));
-
- switch (err)
- {
- case MACH_MSG_SUCCESS:
- break;
- case MACH_SEND_INVALID_REPLY:
- case MACH_RCV_INVALID_NAME:
- __mig_dealloc_reply_port ();
- default:
- return __hurd_fail (err);
- }
-
- if ((m->msgh_bits & MACH_MSGH_BITS_COMPLEX))
- {
- /* Allow no ports or VM. */
- __mach_msg_destroy (m);
- /* Want to return a different error below for a different msgid. */
- if (m->msgh_id == msgid + 100)
- return __hurd_fail (MIG_TYPE_ERROR);
- }
-
- if (m->msgh_id != msgid + 100)
- return __hurd_fail (m->msgh_id == MACH_NOTIFY_SEND_ONCE ?
- MIG_SERVER_DIED : MIG_REPLY_MISMATCH);
-
- if (m->msgh_size != reply_size &&
- m->msgh_size != sizeof (mig_reply_header_t))
- return __hurd_fail (MIG_TYPE_ERROR);
-
- if (*(int *) &msg.header.RetCodeType !=
- ((union { mach_msg_type_t t; int i; })
- { t: io2mach_type (1, _IOTS (sizeof msg.header.RetCode)) }).i)
- return __hurd_fail (MIG_TYPE_ERROR);
- err = msg.header.RetCode;
-
- t = (mach_msg_type_t *) msg.data;
- switch (err)
- {
- case 0:
- if (m->msgh_size != reply_size ||
- out (_IOT_COUNT0 (type), _IOT_TYPE0 (type), arg, &arg) ||
- out (_IOT_COUNT1 (type), _IOT_TYPE1 (type), arg, &arg) ||
- out (_IOT_COUNT2 (type), _IOT_TYPE2 (type), arg, &arg))
- return __hurd_fail (MIG_TYPE_ERROR);
- return 0;
-
- case MIG_BAD_ID:
- case EOPNOTSUPP:
- /* The server didn't understand the RPC. */
- err = ENOTTY;
- default:
- return __hurd_fail (err);
- }
- }
-