From bf2a3dae9f4f828fd1f2f8aaf4769f96520c9552 Mon Sep 17 00:00:00 2001 From: Yves Orton Date: Fri, 5 Aug 2022 13:18:02 +0200 Subject: Add a new env var PERL_RAND_SEED This env var can be used to trigger a repeatable run of a script which calls C with no arguments, either explicitly or implicitly via use of C prior to calling srand(). This is implemented in such a way that calling C with no arguments in forks or subthreads (again explicitly or implicitly) will receive their own seed but the seeds they receive will be repeatable. This is intended for debugging and perl development performance testing, and for running the test suite consistently. It is documented that the exact seeds used to initialize the random state are unspecified, and that they may change between releases or even builds. The only guarantee provided is that the same perl executable will produce the same results twice all other things being equal. In practice and in core testing we do expect consistency, but adding the tightest set of restrictions on our commitments seemed sensible. The env var is ignored when perl is run setuid or setgid similarly to the C env var. --- embedvar.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'embedvar.h') diff --git a/embedvar.h b/embedvar.h index 927a6e5d5f..7f872368bd 100644 --- a/embedvar.h +++ b/embedvar.h @@ -280,6 +280,8 @@ #define PL_sortstash (vTHX->Isortstash) #define PL_splitstr (vTHX->Isplitstr) #define PL_srand_called (vTHX->Isrand_called) +#define PL_srand_override (vTHX->Isrand_override) +#define PL_srand_override_next (vTHX->Isrand_override_next) #define PL_stack_base (vTHX->Istack_base) #define PL_stack_max (vTHX->Istack_max) #define PL_stack_sp (vTHX->Istack_sp) -- cgit v1.2.1