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Revert "random-state-from-platform: simplify pid conditional, and clarify docs."

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This reverts commit 08904661a2.
This commit is contained in:
Mark H Weaver 2013-02-25 13:33:14 -05:00
parent 08904661a2
commit 444b26f739
2 changed files with 12 additions and 11 deletions
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6
doc/ref/api-data.texi
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@ -1872,9 +1872,9 @@ read back with the Scheme reader.
Construct a new random state seeded from a platform-specific source of
entropy, appropriate for use in non-security-critical applications.
Currently @file{/dev/urandom} is tried first, or else the seed is based
on the time, date, process ID (if scm_getpid is present), an address
from a freshly allocated heap cell, an address from the local stack
frame, and a high-resolution timer if available.
on the time, date, process ID, an address from a freshly allocated heap
cell, an address from the local stack frame, and a high-resolution timer
if available.
@end deffn
@defvar *random-state*

17
libguile/random.c
View file

@ -653,11 +653,11 @@ SCM_DEFINE (scm_random_exp, "random:exp", 0, 1, 0,
}
#undef FUNC_NAME
/* Return a new random-state seeded from the time, date, process ID (if
scm_getpid is present), an address from a freshly allocated heap
cell, an address from the local stack frame, and a high-resolution
timer if available. This is only to be used as a last resort, when
no better source of entropy is available. */
/* Return a new random-state seeded from the time, date, process ID, an
address from a freshly allocated heap cell, an address from the local
stack frame, and a high-resolution timer if available. This is only
to be used as a last resort, when no better source of entropy is
available. */
static SCM
random_state_of_last_resort (void)
{
@ -665,9 +665,6 @@ random_state_of_last_resort (void)
SCM time_of_day = scm_gettimeofday ();
SCM sources = scm_list_n
(scm_from_unsigned_integer (SCM_UNPACK (time_of_day)), /* heap addr */
#ifdef HAVE_POSIX
scm_getpid (), /* process ID */
#endif
scm_get_internal_real_time (), /* high-resolution process timer */
scm_from_unsigned_integer ((scm_t_bits) &time_of_day), /* stack addr */
scm_car (time_of_day), /* seconds since midnight 1970-01-01 UTC */
@ -675,6 +672,10 @@ random_state_of_last_resort (void)
SCM_UNDEFINED);
SCM seed = SCM_INUM0;
#ifdef HAVE_POSIX
sources = scm_cons (scm_getpid (), sources); /* process ID */
#endif
/* Concatenate the sources bitwise to form the seed */
while (scm_is_pair (sources))
{