Ichthyostega
f6fbc15e5f
- can now create a Job from JobTicket::NIL - on invocation this Job will to nothing Only when the first real output backend is implemented, we can decide if this simplistic implementation is enough, or if an empty output must be explicitly generated...
123 lines
2.7 KiB
C
123 lines
2.7 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));
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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);
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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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