From 76ccdd97c60561e5b3fb23f5d88049dc074d6559 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 17 May 2022 10:53:13 +0200
Subject: Handle stack size querying on OpenBSD

---
 libbuild2/scheduler.cxx | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/libbuild2/scheduler.cxx b/libbuild2/scheduler.cxx
index 469ded7..5027f90 100644
--- a/libbuild2/scheduler.cxx
+++ b/libbuild2/scheduler.cxx
@@ -5,8 +5,11 @@
 
 #if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__)
 #  include <pthread.h>
-#  ifdef __FreeBSD__
+#  if defined(__FreeBSD__)
 #    include <pthread_np.h> // pthread_attr_get_np() (in <pthread.h> on NetBSD)
+#  elif defined(__OpenBSD__)
+#    include <sys/signal.h>
+#    include <pthread_np.h> // pthread_stackseg_np()
 #  endif
 #endif
 
@@ -850,6 +853,15 @@ namespace build2
       if (r != 0)
         throw_system_error (r);
 
+#elif defined(__OpenBSD__)
+      stack_t s;
+      int r (pthread_stackseg_np (pthread_self (), &s));
+
+      if (r != 0)
+        throw_system_error (r);
+
+      stack_size = s.ss_size;
+
 #else // defined(__APPLE__)
       stack_size = pthread_get_stacksize_np (pthread_self ());
 #endif
-- 
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