From f9681776c97757540200b6a0261c89c57c94f580 Mon Sep 17 00:00:00 2001
From: "Gregory P. Smith" <greg@krypto.org>
Date: Sat, 25 Apr 2015 23:43:34 -0700
Subject: Fix computation of max_fd on OpenBSD.  Issue #23852.

---
 Modules/_posixsubprocess.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Modules/_posixsubprocess.c b/Modules/_posixsubprocess.c
index f0a272e..452d592 100644
--- a/Modules/_posixsubprocess.c
+++ b/Modules/_posixsubprocess.c
@@ -14,6 +14,9 @@
 #ifdef HAVE_SYS_SYSCALL_H
 #include <sys/syscall.h>
 #endif
+#if defined(HAVE_SYS_RESOURCE_H)
+#include <sys/resource.h>
+#endif
 #ifdef HAVE_DIRENT_H
 #include <dirent.h>
 #endif
@@ -174,6 +177,13 @@ safe_get_max_fd(void)
     if (local_max_fd >= 0)
         return local_max_fd;
 #endif
+#if defined(HAVE_SYS_RESOURCE_H) && defined(__OpenBSD__)
+    struct rlimit rl;
+    /* Not on the POSIX async signal safe functions list but likely
+     * safe.  TODO - Someone should audit OpenBSD to make sure. */
+    if (getrlimit(RLIMIT_NOFILE, &rl) >= 0)
+        return (long) rl.rlim_max;
+#endif
 #ifdef _SC_OPEN_MAX
     local_max_fd = sysconf(_SC_OPEN_MAX);
     if (local_max_fd == -1)
-- 
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