propagate prefork value

otherwise the child processes still believet the prefork value is
3 and can end up reading/writing out of bounds when setting up the
sockets.  Actually, server processes shouldn't create pipes to other
servers, but this is left for a follow-up diff.

Issue reported by la ninpre, thank you!

2 files changed, 8 insertions, 0 deletions

diff --git a/regress/regress b/regress/regress
index 0ace045..82d17a9 100755
--- a/regress/regress
+++ b/regress/regress
@@ -68,6 +68,7 @@ run_test test_log_file
 run_test test_ipv4_addr
 run_test test_ipv6_addr need_ipv6
 run_test test_ipv6_server need_ipv6
+run_test test_high_prefork
 
 # TODO: add test that uses only a TLSv1.2 or TLSv1.3
 # TODO: add a test that attempt to serve a non-regular file
diff --git a/regress/tests.sh b/regress/tests.sh
index 4581df0..7648278 100644
--- a/regress/tests.sh
+++ b/regress/tests.sh
@@ -521,3 +521,10 @@ test_ipv6_server() {
 	fetch /
 	check_reply "20 text/gemini" "# hello world" || return 1
 }
+
+test_high_prefork() {
+	setup_simple_test 'prefork 12'
+
+	fetch /
+	check_reply "20 text/gemini" "# hello world" || return 1
+}