From fad2b86c9e7eaadb973b50a1bc0e2accc1a96cfd Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Thu, 31 May 2007 22:16:38 +0000
Subject: use "glibc errno" trick not only for ash, but for entire busybox
 (add/remove: 1/1 grow/shrink: 37/37 up/down: 139/-228)        Total: -89
 bytes

---
 include/libbb.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'include')

diff --git a/include/libbb.h b/include/libbb.h
index 5e0b438be..385b30f16 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -165,6 +165,14 @@
 #endif
 
 
+#if defined(__GLIBC__)
+/* glibc uses __errno_location() to get a ptr to errno */
+/* We can just memorize it once - no multithreading in busybox :) */
+extern int *const bb_errno;
+#undef errno
+#define errno (*bb_errno)
+#endif
+
 #if defined(__GLIBC__) && __GLIBC__ < 2
 int vdprintf(int d, const char *format, va_list ap);
 #endif
-- 
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