87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <hurd.h>
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/* Change the size of the descriptor table.
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You cannot shrink the table if any of the descriptors
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which would be removed are being used. */
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int
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setdtablesize (size_t size)
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{
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int i;
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struct _hurd_fd *table;
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__mutex_lock (&_hurd_dtable_lock);
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/* Check that no descriptors which are in use are going to disappear. */
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for (i = size; i < _hurd_dtable.size; ++i)
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{
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struct _hurd_fd *const d = &_hurd_dtable.d[i];
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__spin_lock (&d->port.lock);
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if (d->port.port != MACH_PORT_NULL)
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{
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__spin_unlock (&d->port.lock);
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__mutex_unlock (&_hurd_dtable_lock);
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errno = EBUSY;
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return -1;
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}
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}
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/* Resize the table. */
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if (_hurd_dtable_user_dealloc == NULL)
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/* Noone is using the table. We can relocate it. */
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table = realloc (_hurd_dtable.d, size * sizeof (*table));
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else
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/* Someone else is using the table.
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We must make a new copy, and let them free the old one. */
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table = malloc (size * sizeof (*table));
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if (table == NULL)
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{
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__mutex_unlock (&_hurd_dtable_lock);
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return -1;
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}
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if (_hurd_dtable_user_dealloc != NULL)
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{
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*_hurd_dtable_user_dealloc = 1;
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_hurd_dtable_user_dealloc = NULL;
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memcpy (table, _hurd_dtable.d, _hurd_dtable.size * sizeof (table[0]));
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}
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/* If the table grew, initialize the new slots. */
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for (i = _hurd_dtable.size; i < size; ++i)
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{
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table[i].flags = 0;
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_hurd_port_init (&table[i].port, MACH_PORT_NULL);
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_hurd_port_init (&table[i].ctty, MACH_PORT_NULL);
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}
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_hurd_dtable.size = size;
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_hurd_dtable.d = table;
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__mutex_unlock (&_hurd_dtable_lock);
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return 0;
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}
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