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- /* Copyright (C) 1992 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>
-
- /* 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, arg),
- int fd AND int request AND PTR arg)
- {
- /* 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 };
-
- /* Message buffer. */
- char msg[sizeof (mach_msg_header_t) + /* Header. */
- sizeof (mach_msg_type_t) + 4 /* Return code. */
- 3 * (sizeof (mach_msg_type_t) + (4 * 32))]; /* Argument data. */
- mach_msg_header_t *m = (mach_msg_header_t *) msg;
- mach_msg_type_t *t = (mach_msg_type_t *) &m[1];
- mach_msg_id_t msgid;
-
- union __ioctl r;
- 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, unsigned int type)
- {
- if (count > 0)
- {
- void *const p = &t[1];
- const size_t len = count * (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 (t, store, len);
- if (update != NULL)
- *update += len;
- t = (void *) t + ((len + sizeof (*t) - 1) / sizeof (*t) * sizeof *t);
- }
- return 0;
- }
-
- /* Pack the argument data. */
- r.i = request;
-
- msgid = 100000 + ((r.s.group << 2) * 1000) + r.s.command;
-
- in (r.s.count0, r.s.type0);
- in (r.s.count1, r.s.type1);
- in (r.s.count2, r.s.type2);
-
- err = _HURD_DPORT_USE
- (fd,
- ({
- m->msgh_size = (char *) t - msg;
- m->msgh_request_port = port;
- m->msgh_reply_port = __mig_reply_port ();
- m->msgh_seqno = 0;
- m->msgh_id = msgid;
- m->msgh_bits = ?; /* XXX */
- _HURD_EINTR_RPC (port, __mach_msg (m, MACH_SEND_MSG|MACH_RCV_MSG,
- m->msgh_size, sizeof (msg),
- m->msgh_reply_port,
- MACH_MSG_TIMEOUT_NONE,
- MACH_PORT_NULL));
- }));
-
- 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_id != msgid + 100)
- return __hurd_fail (m->msgh_id == MACH_NOTIFY_SEND_ONCE ?
- MIG_SERVER_DIED : MIG_REPLY_MISMATCH);
-
- if ((m->msgh_bits & MACH_MSGH_BITS_COMPLEX) ||
- m->msgh_size != (char *) t - msg)
- return __hurd_fail (MIG_TYPE_ERROR);
-
- t = (mach_msg_type_t) &m[1];
- if (out (1, _IOTS (sizeof (error_t)), &err, NULL) ||
- out (r.s.count0, r.s.type0, arg, &arg) ||
- out (r.s.count1, r.s.type2, arg, &arg) ||
- out (r.s.count2, r.s.type2, arg, &arg))
- return __hurd_fail (MIG_TYPE_ERROR);
-
- if (err)
- return __hurd_fail (err);
- return 0;
- }
-