Ichthyostega
0b9e184fa3
* most usages are drop-in replacements * occasionally the other convenience functions can be used * verify call-paths from core code to identify usages * ensure reseeding for all tests involving some kind of randomness... __Note__: some tests were not yet converted, since their usage of randomness is actually not thread-safe. This problem existed previously, since also `rand()` is not thread safe, albeit in most cases it is possible to ignore this problem, as ''garbled internal state'' is also somehow „random“
123 lines
3 KiB
C
123 lines
3 KiB
C
/*
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LUID - Lumiera unique identifiers
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Copyright (C) Lumiera.org
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2008, Christian Thaeter <ct@pipapo.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file luid.c
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** Implementation functions for Lumiera's unique object identifier (LUID).
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*/
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#include "lib/luid.h"
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdint.h>
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void
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lumiera_uid_set_ptr (lumiera_uid* luid, void* ptr)
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{
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memset (luid, 0, 16);
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*(void**)luid = ptr;
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}
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void*
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lumiera_uid_ptr_get (const lumiera_uid* luid)
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{
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return *(void**)luid;
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}
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void
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lumiera_uid_gen (lumiera_uid* luid)
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{
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static int fd = -2;
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if (!luid)
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return;
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if (fd == -2)
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{
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fd = open ("/dev/urandom", O_RDONLY);
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/* on linux /dev/random would be way to slow for our purpose, so we comment that out for now.
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other unixiods offer a /dev/random which has the same semantics as linux /dev/urandom has,
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configuration should do this right some day.
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if (fd == -1)
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fd = open ("/dev/random", O_RDONLY);
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*/
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if (fd >= 0)
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fcntl (fd, F_SETFD, FD_CLOEXEC);
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else
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srand (getpid () + time (NULL)); //////////////////////////////////////////////////////////////////TICKET #1381 : entropy source should be configurable
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}
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do
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{
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if (fd < 0)
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{
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for (int i = 0; i < 16; ++i)
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((unsigned char*)luid)[i] = (unsigned char)(rand()>>7); ///////////////////////////////////////TICKET #1381 : this fallback should certainly not happen silently
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}
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else
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{
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if (read (fd, luid, 16) < 16)
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abort ();
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}
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}
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/* we identify generic pointers by having some zeros in the LUID,
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* Accidentally, but very unlikely this might happen within a random LUID;
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* just regenerate in this case */
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while (!*(((intptr_t*)luid)+1));
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}
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void
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lumiera_uid_copy (lumiera_uid* dest, lumiera_uid* src)
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{
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memcpy (dest, src, 16);
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}
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int
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lumiera_uid_eq (const lumiera_uid* luida, const lumiera_uid* luidb)
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{
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return !memcmp (luida, luidb, 16);
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}
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size_t
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lumiera_uid_hash (const lumiera_uid* luid)
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{
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return *(size_t*)luid;
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}
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/*
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// Local Variables:
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// mode: C
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// c-file-style: "gnu"
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// indent-tabs-mode: nil
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// End:
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*/
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