[llvm] [lit] Update shtest-ulimit.py to explicitly check default limits (PR #164678)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/164678

The recently added ulimit_reset.txt section in shtest-ulimit.py was failing on some builders if the default file descriptor limit started with 50. This patch fixes that by explicitly checking that the file descriptor limit is equal to the default value.

>From a0977cd8bac457f69fb8cf3e89fcb0f353f6093c Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Wed, 22 Oct 2025 17:59:56 +0000
Subject: [PATCH] [lit] Update shtest-ulimit.py to explicitly check default
 limits

The recently added ulimit_reset.txt section in shtest-ulimit.py was
failing on some builders if the default file descriptor limit started
with 50. This patch fixes that by explicitly checking that the file
descriptor limit is equal to the default value.
---
 llvm/utils/lit/tests/shtest-ulimit.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/llvm/utils/lit/tests/shtest-ulimit.py b/llvm/utils/lit/tests/shtest-ulimit.py
index 9a8febd3333c4..dadde70336812 100644
--- a/llvm/utils/lit/tests/shtest-ulimit.py
+++ b/llvm/utils/lit/tests/shtest-ulimit.py
@@ -5,7 +5,11 @@
 # as well.
 # UNSUPPORTED: system-windows, system-solaris
 
-# RUN: not %{lit} -a -v %{inputs}/shtest-ulimit --order=lexical | FileCheck %s
+# RUN: %{python} %S/Inputs/shtest-ulimit/print_limits.py | grep RLIMIT_NOFILE \
+# RUN:   | sed -n -e 's/.*=//p' | tr -d '\n' > %t.nofile_limit
+
+# RUN: not %{lit} -a -v %{inputs}/shtest-ulimit --order=lexical \
+# RUN:   | FileCheck -DBASE_NOFILE_LIMIT=%{readfile:%t.nofile_limit} %s
 
 # CHECK: -- Testing: 3 tests{{.*}}
 
@@ -18,4 +22,4 @@
 # CHECK: RLIMIT_NOFILE=50
 
 # CHECK-LABEL: FAIL: shtest-ulimit :: ulimit_reset.txt ({{[^)]*}})
-# CHECK-NOT: RLIMIT_NOFILE=50
+# CHECK: RLIMIT_NOFILE=[[BASE_NOFILE_LIMIT]]