tools/ci.sh: Set ulimit -n for unix CI.

jimmo · dpgeorge · commit 74fd7b3d32e1 · 2023-12-21T11:05:31.000+11:00
Signed-off-by: Jim Mussared &lt;jim.mussared@gmail.com&gt;
diff --git a/tests/extmod/select_poll_fd.py b/tests/extmod/select_poll_fd.py
@@ -35,7 +35,8 @@
 print(poller.poll(0))
 
 # Test registering a very large number of file descriptors (will trigger
-# EINVAL due to more than OPEN_MAX fds).
+# EINVAL due to more than OPEN_MAX fds). Typically it's 1024 (and on GitHub CI
+# we force this via `ulimit -n 1024`).
 poller = select.poll()
 for fd in range(6000):
     poller.register(fd)
diff --git a/tools/ci.sh b/tools/ci.sh
@@ -6,6 +6,9 @@ else
     MAKEOPTS="-j$(sysctl -n hw.ncpu)"
 fi
 
+# Ensure known OPEN_MAX (NO_FILES) limit.
+ulimit -n 1024
+
 ########################################################################################
 # general helper functions
 
