48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
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/* mlock -- guarantee pages are resident in memory. Mach/Hurd version.
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Copyright (C) 2001-2022 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <hurd.h>
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#include <mach/mach_host.h>
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/* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to
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be memory resident. */
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int
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mlock (const void *addr, size_t len)
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{
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mach_port_t host;
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vm_address_t page;
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error_t err;
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err = __get_privileged_ports (&host, NULL);
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if (err)
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host = __mach_host_self();
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page = trunc_page ((vm_address_t) addr);
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len = round_page ((vm_address_t) addr + len) - page;
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err = __vm_wire (host, __mach_task_self (), page, len, VM_PROT_READ);
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if (host != __mach_host_self())
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__mach_port_deallocate (__mach_task_self (), host);
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return err ? __hurd_fail (err) : 0;
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}
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