From: Kirill A. Korinsky <kirill@korins.ky>
Subject: Re: lang/rust: migrate to getexecpath()
To: ports@openbsd.org
Date: Tue, 08 Sep 2026 13:01:43 +0200

On Tue, 08 Sep 2026 00:44:20 +0200,
Stuart Henderson <stu@spacehopper.org> wrote:
> 
> On 2026/09/03 23:22, Kirill A. Korinsky wrote:
> > I'd like to migrate our rust to use of getexecpath(), it should allow to
> > drop a lot of patches to remove usage of current_exe()
> 
> If anyone knows a bit of C++ and has time, one of the other common
> implementations of path lookup for the current executable is in Boost,
> https://github.com/boostorg/dll/blob/HEAD/include/boost/dll/detail/posix/program_location_impl.hpp#L53
> 

I not follow the modern C++ well enough, but I think it needs something like
that:

diff --git a/include/boost/dll/detail/posix/program_location_impl.hpp b/include/boost/dll/detail/posix/program_location_impl.hpp
index 500afc6..b15ad4b 100644
--- a/include/boost/dll/detail/posix/program_location_impl.hpp
+++ b/include/boost/dll/detail/posix/program_location_impl.hpp
@@ -113,6 +113,30 @@ namespace boost { namespace dll { namespace detail {
 
 
 
+#elif BOOST_OS_BSD_OPEN
+
+#if !defined(BOOST_DLL_INTERFACE_UNIT)
+#include <errno.h>
+#include <limits.h>
+#include <unistd.h>
+#endif // !defined(BOOST_DLL_INTERFACE_UNIT)
+
+namespace boost { namespace dll { namespace detail {
+    inline boost::dll::fs::path program_location_impl(std::error_code& ec) {
+        ec.clear();
+
+        char path[PATH_MAX];
+        if (getexecpath(path, sizeof(path)) != 0) {
+            ec = std::make_error_code(
+                static_cast<std::errc>(errno)
+            );
+            return boost::dll::fs::path();
+        }
+
+        return boost::dll::fs::path(path);
+    }
+}}} // namespace boost::dll::detail
+
 #elif BOOST_OS_BSD_NET
 
 namespace boost { namespace dll { namespace detail {


-- 
wbr, Kirill