From 2ab314e6878a2f9f7170a8747401450be5b13184 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Mon, 12 Nov 2018 16:49:06 -0800
Subject: [PATCH] ircd::buffer: Improve exceptions thrown from aligned_alloc().

---
 include/ircd/buffer/unique_buffer.h | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/include/ircd/buffer/unique_buffer.h b/include/ircd/buffer/unique_buffer.h
index bb4225926..94e3d59e0 100644
--- a/include/ircd/buffer/unique_buffer.h
+++ b/include/ircd/buffer/unique_buffer.h
@@ -119,14 +119,21 @@ ircd::buffer::aligned_alloc(const size_t &align,
 
 	int errc;
 	void *ret;
-	if(unlikely((errc = ::posix_memalign(&ret, alignment, size)) != 0))
-		throw std::system_error
-		{
-			errc, std::system_category()
-		};
+	switch((errc = ::posix_memalign(&ret, alignment, size)))
+	{
+		case 0:
+			break;
+
+		case int(std::errc::not_enough_memory):
+			throw std::bad_alloc{};
+
+		default:
+			throw std::system_error
+			{
+				errc, std::system_category()
+			};
+	}
 
-	assert(errc == 0);
-	assert(ret != nullptr);
 	return std::unique_ptr<char, decltype(&std::free)>
 	{
 		reinterpret_cast<char *>(ret), std::free