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Update.
* sysdeps/unix/i386/i686/tempname.c: New file. * sysdeps/posix/tempname.c (__gen_tempname): If RANDOM_BITS is defined use this macro to get some bits of randomness instead of the usual gettimeofday or time calls. 2001-03-16 Paul Eggert <eggert@twinsun.com> * sysdeps/posix/tempname.c (uint64_t): Define to uintmax_t if not defined, and if UINT64_MAX is not defined. 2001-03-19 Ulrich Drepper <drepper@redhat.com>
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ChangeLog
13
ChangeLog
@ -1,3 +1,16 @@
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2001-03-19 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/unix/i386/i686/tempname.c: New file.
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* sysdeps/posix/tempname.c (__gen_tempname): If RANDOM_BITS is
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defined use this macro to get some bits of randomness instead of
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the usual gettimeofday or time calls.
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2001-03-16 Paul Eggert <eggert@twinsun.com>
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* sysdeps/posix/tempname.c (uint64_t): Define to uintmax_t if
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not defined, and if UINT64_MAX is not defined.
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2001-03-19 Ulrich Drepper <drepper@redhat.com>
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* elf/cache.c: Mark and have translated a few more messages.
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@ -1445,6 +1445,9 @@ c = 0xb = 11
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but they can also be changed by the user. @code{m} is of course 2^48
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since the state consists of a 48-bit array.
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The prototypes for these functions are in @file{stdlib.h}.
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@pindex stdlib.h
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@comment stdlib.h
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@comment SVID
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@ -107,6 +107,15 @@
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# define __secure_getenv getenv
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#endif
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/* Use the widest available unsigned type if uint64_t is not
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available. The algorithm below extracts a number less than 62**6
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(approximately 2**35.725) from uint64_t, so ancient hosts where
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uintmax_t is only 32 bits lose about 3.725 bits of randomness,
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which is better than not having mkstemp at all. */
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#if !defined UINT64_MAX && !defined uint64_t
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# define uint64_t uintmax_t
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#endif
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/* Return nonzero if DIR is an existent directory. */
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static int
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direxists (const char *dir)
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@ -218,14 +227,18 @@ __gen_tempname (char *tmpl, int kind)
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XXXXXX = &tmpl[len - 6];
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/* Get some more or less random data. */
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#if HAVE_GETTIMEOFDAY || _LIBC
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#ifdef RANDOM_BITS
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RANDOM_BITS (random_time_bits);
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#else
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# if HAVE_GETTIMEOFDAY || _LIBC
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{
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struct timeval tv;
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__gettimeofday (&tv, NULL);
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random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
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}
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#else
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# else
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random_time_bits = time (NULL);
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# endif
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#endif
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value += random_time_bits ^ __getpid ();
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35
sysdeps/unix/i386/i686/tempname.c
Normal file
35
sysdeps/unix/i386/i686/tempname.c
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@ -0,0 +1,35 @@
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/* Copyright (C) 2001 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 not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* For i686 and up we have a better and faster source of random bits in the
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form of the time stamp counter. */
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#define RANDOM_BITS(Var) \
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if (__builtin_expect (value == UINT64_C (0), 0)) \
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{ \
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/* If this is the first time this function is used initialize \
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the variable we accumulate the value in to some somewhat \
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random value. If we'd not do this programs at startup time \
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might have a reduced set of possible names, at least on slow \
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machines. */ \
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struct timeval tv; \
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__gettimeofday (&tv, NULL); \
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value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \
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} \
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__asm__ __volatile__ ("rdtsc" : "=A" (Var))
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#include_next <tempname.c>
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