From 324ca5b489076e548258fb7acd9ed3c238406eda Mon Sep 17 00:00:00 2001
From: Raul Tambre <raul@tambre.ee>
Date: Fri, 24 Jun 2022 21:19:01 +0300
Subject: Tests/CTestTestFdSetSize: Support plain POSIX

When compiling in ISO C mode functions from newer POSIX standards such as
usleep() and nanosleep() aren't available.
Fortunately select() allows timing out with microsecond precision.
---
 Tests/CTestTestFdSetSize/sleep.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/Tests/CTestTestFdSetSize/sleep.c b/Tests/CTestTestFdSetSize/sleep.c
index 2fb6490..d55cec6 100644
--- a/Tests/CTestTestFdSetSize/sleep.c
+++ b/Tests/CTestTestFdSetSize/sleep.c
@@ -1,7 +1,11 @@
 #if defined(_WIN32)
 #  include <windows.h>
-#else
+#elif _XOPEN_SOURCE >= 500 || defined(_ALL_SOURCE)
 #  include <unistd.h>
+#else
+#  include <time.h>
+
+#  include <sys/select.h>
 #endif
 
 /* sleeps for 0.1 second */
@@ -9,8 +13,14 @@ int main(int argc, char** argv)
 {
 #if defined(_WIN32)
   Sleep(100);
-#else
+#elif _XOPEN_SOURCE >= 500 || defined(_ALL_SOURCE)
   usleep(100 * 1000);
+#else
+  struct timeval tv;
+  tv.tv_sec = 0;
+  tv.tv_usec = 100 * 1000;
+
+  select(0, NULL, NULL, NULL, &tv);
 #endif
   return 0;
 }
-- 
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