/* ioctl commands which must be done in the C library.
- Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
+ Copyright (C) 1994,95,96,97,99,2001,2002,2009,2010
+ 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.
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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.
+ Lesser 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/fd.h>
#include <sys/ioctl.h>
#include <hurd/ioctl.h>
-
+#include <string.h>
/* Symbol set of ioctl handler lists. If there are user-registered
#include <hurd/term.h>
#include <hurd/tioctl.h>
-static void
-rectty_dtable (mach_port_t cttyid)
+/* Install a new CTTYID port, atomically updating the dtable appropriately.
+ This consumes the send right passed in. */
+
+void
+_hurd_locked_install_cttyid (mach_port_t cttyid)
{
+ mach_port_t old;
+ struct hurd_port *const port = &_hurd_ports[INIT_PORT_CTTYID];
+ struct hurd_userlink ulink;
int i;
- HURD_CRITICAL_BEGIN;
- __mutex_lock (&_hurd_dtable_lock);
+ /* Install the new cttyid port, and preserve it with a ulink.
+ We unroll the _hurd_port_set + _hurd_port_get here so that
+ there is no window where the cell is unlocked and CTTYID could
+ be changed by another thread. (We also delay the deallocation
+ of the old port until the end, to minimize the duration of the
+ critical section.)
+
+ It is important that changing the cttyid port is only ever done by
+ holding the dtable lock continuously while updating the port cell and
+ re-ctty'ing the dtable; dtable.c assumes we do this. Otherwise, the
+ pgrp-change notification code in dtable.c has to worry about racing
+ against us here in odd situations. The one exception to this is
+ setsid, which holds the dtable lock while changing the pgrp and
+ clearing the cttyid port, and then unlocks the dtable lock to allow
+
+
+ */
+
+ __spin_lock (&port->lock);
+ old = _hurd_userlink_clear (&port->users) ? port->port : MACH_PORT_NULL;
+ port->port = cttyid;
+ cttyid = _hurd_port_locked_get (port, &ulink);
for (i = 0; i < _hurd_dtablesize; ++i)
{
struct hurd_fd *const d = _hurd_dtable[i];
- mach_port_t newctty;
+ mach_port_t newctty = MACH_PORT_NULL;
if (d == NULL)
/* Nothing to do for an unused descriptor cell. */
continue;
- if (cttyid == MACH_PORT_NULL)
- /* We now have no controlling tty at all. */
- newctty = MACH_PORT_NULL;
- else
+ if (cttyid != MACH_PORT_NULL)
+ /* We do have some controlling tty. */
HURD_PORT_USE (&d->port,
({ mach_port_t id;
/* Get the io object's cttyid port. */
if (! __term_getctty (port, &id))
{
- if (id == cttyid && /* Is it ours? */
+ if (id == cttyid /* Is it ours? */
/* Get the ctty io port. */
- __term_open_ctty (port,
- _hurd_pid, _hurd_pgrp,
- &newctty))
+ && __term_open_ctty (port,
+ _hurd_pid, _hurd_pgrp,
+ &newctty))
/* XXX it is our ctty but the call failed? */
newctty = MACH_PORT_NULL;
- __mach_port_deallocate
- (__mach_task_self (), (mach_port_t) id);
+ __mach_port_deallocate (__mach_task_self (), id);
}
- else
- newctty = MACH_PORT_NULL;
0;
}));
}
__mutex_unlock (&_hurd_dtable_lock);
+
+ if (old != MACH_PORT_NULL)
+ __mach_port_deallocate (__mach_task_self (), old);
+ _hurd_port_free (port, &ulink, cttyid);
+}
+
+static void
+install_ctty (mach_port_t cttyid)
+{
+ HURD_CRITICAL_BEGIN;
+ __mutex_lock (&_hurd_dtable_lock);
+ _hurd_locked_install_cttyid (cttyid);
HURD_CRITICAL_END;
}
}
/* Install the port, consuming the reference we just created. */
- _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], cttyid);
-
- /* Reset all the ctty ports in all the descriptors. */
- __USEPORT (CTTYID, (rectty_dtable (cttyid), 0));
+ install_ctty (cttyid);
return 0;
}
-/* Make FD be the controlling terminal.
- This function is called for `ioctl (fd, TCIOSCTTY)'. */
-
-static int
-tiocsctty (int fd,
- int request) /* Always TIOCSCTTY. */
+static inline error_t
+do_tiocsctty (io_t port, io_t ctty)
{
mach_port_t cttyid;
error_t err;
- /* Get FD's cttyid port, unless it is already ours. */
- err = HURD_DPORT_USE (fd, ctty != MACH_PORT_NULL ? EADDRINUSE :
- __term_getctty (port, &cttyid));
- if (err == EADDRINUSE)
- /* FD is already the ctty. Nothing to do. */
+ if (ctty != MACH_PORT_NULL)
+ /* PORT is already the ctty. Nothing to do. */
return 0;
- else if (err)
- return __hurd_fail (err);
+
+ /* Get PORT's cttyid port. */
+ err = __term_getctty (port, &cttyid);
+ if (err)
+ return err;
/* Change the terminal's pgrp to ours. */
- err = HURD_DPORT_USE (fd, __tioctl_tiocspgrp (port, _hurd_pgrp));
+ err = __tioctl_tiocspgrp (port, _hurd_pgrp);
if (err)
- return __hurd_fail (err);
+ __mach_port_deallocate (__mach_task_self (), cttyid);
+ else
+ /* Make it our own. */
+ install_ctty (cttyid);
- /* Make it our own. */
- _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], cttyid);
+ return err;
+}
- /* Reset all the ctty ports in all the descriptors. */
- __USEPORT (CTTYID, (rectty_dtable (cttyid), 0));
+/* Make FD be the controlling terminal.
+ This function is called for `ioctl (fd, TCIOSCTTY)'. */
- return 0;
+static int
+tiocsctty (int fd,
+ int request) /* Always TIOCSCTTY. */
+{
+ return __hurd_fail (HURD_DPORT_USE (fd, do_tiocsctty (port, ctty)));
}
_HURD_HANDLE_IOCTL (tiocsctty, TIOCSCTTY);
if (err)
return __hurd_fail (err);
- /* Clear our cttyid port cell. */
- _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], MACH_PORT_NULL);
-
- /* Reset all the ctty ports in all the descriptors. */
-
- __USEPORT (CTTYID, (rectty_dtable (MACH_PORT_NULL), 0));
+ /* Clear our cttyid port. */
+ install_ctty (MACH_PORT_NULL);
return 0;
}
_HURD_HANDLE_IOCTL (tiocnotty, TIOCNOTTY);
+\f
+#include <hurd/pfinet.h>
+#include <net/if.h>
+#include <netinet/in.h>
+
+/* Fill in the buffer IFC->IFC_BUF of length IFC->IFC_LEN with a list
+ of ifr structures, one for each network interface. */
+static int
+siocgifconf (int fd, int request, struct ifconf *ifc)
+{
+ error_t err;
+ size_t data_len = ifc->ifc_len;
+ char *data = ifc->ifc_buf;
+
+ if (data_len <= 0)
+ return 0;
+
+ err = HURD_DPORT_USE (fd, __pfinet_siocgifconf (port, ifc->ifc_len,
+ &data, &data_len));
+ if (data_len < ifc->ifc_len)
+ ifc->ifc_len = data_len;
+ if (data != ifc->ifc_buf)
+ {
+ memcpy (ifc->ifc_buf, data, ifc->ifc_len);
+ __vm_deallocate (__mach_task_self (), (vm_address_t) data, data_len);
+ }
+ return err ? __hurd_dfail (fd, err) : 0;
+}
+_HURD_HANDLE_IOCTL (siocgifconf, SIOCGIFCONF);
projects / platform / upstream / glibc.git / blobdiff