From e9b5929b22116cb714adfe88ba39a817e89b019c Mon Sep 17 00:00:00 2001
From: eldritch horrors <pennae@lix.systems>
Date: Wed, 6 Mar 2024 05:45:40 +0100
Subject: [PATCH] Merge pull request #9860 from 9999years/set-stack-darwin

Increase stack size on macOS as well as Linux

(cherry picked from commit efb91d5979a625d5c50558aeabfd24e802ed9173,
4a2444b3f32a2f5d42c4d65302793b987d1ac667)
Change-Id: Ieb72283c61bb9e360683f531d6635697b293c313
---
 src/libutil/util.cc | 23 ++++++++++++++---------
 src/libutil/util.hh |  3 ++-
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index baff6624c..6fcce5d67 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -1856,20 +1856,27 @@ static void restoreSignals()
         throw SysError("restoring signals");
 }
 
-#if __linux__
 rlim_t savedStackSize = 0;
-#endif
 
-void setStackSize(size_t stackSize)
+void setStackSize(rlim_t stackSize)
 {
-    #if __linux__
     struct rlimit limit;
     if (getrlimit(RLIMIT_STACK, &limit) == 0 && limit.rlim_cur < stackSize) {
         savedStackSize = limit.rlim_cur;
-        limit.rlim_cur = stackSize;
-        setrlimit(RLIMIT_STACK, &limit);
+        limit.rlim_cur = std::min(stackSize, limit.rlim_max);
+        if (setrlimit(RLIMIT_STACK, &limit) != 0) {
+            logger->log(
+                lvlError,
+                hintfmt(
+                    "Failed to increase stack size from %1% to %2% (maximum allowed stack size: %3%): %4%",
+                    savedStackSize,
+                    stackSize,
+                    limit.rlim_max,
+                    std::strerror(errno)
+                ).str()
+            );
+        }
     }
-    #endif
 }
 
 #if __linux__
@@ -1930,7 +1937,6 @@ void restoreProcessContext(bool restoreMounts)
         restoreMountNamespace();
     }
 
-    #if __linux__
     if (savedStackSize) {
         struct rlimit limit;
         if (getrlimit(RLIMIT_STACK, &limit) == 0) {
@@ -1938,7 +1944,6 @@ void restoreProcessContext(bool restoreMounts)
             setrlimit(RLIMIT_STACK, &limit);
         }
     }
-    #endif
 }
 
 /* RAII helper to automatically deregister a callback. */
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index b302d6f45..bcee42327 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -8,6 +8,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/resource.h>
 #include <dirent.h>
 #include <unistd.h>
 #include <signal.h>
@@ -447,7 +448,7 @@ void runProgram2(const RunOptions & options);
 /**
  * Change the stack size.
  */
-void setStackSize(size_t stackSize);
+void setStackSize(rlim_t stackSize);
 
 
 /**