migrate __errno() to using _perthread.h macros

1 files changed, 12 insertions, 3 deletions

diff --git a/src/errno/__errno.c b/src/errno/__errno.c
index 99061185..b3016d32 100644
--- a/src/errno/__errno.c
+++ b/src/errno/__errno.c
@@ -1,8 +1,17 @@
 #include <errno.h>
-#include "../_nonstd.h"
+#include "../_perthread.h"
+
+/*
+This version of __errno() is for single-threaded programs and those compiled
+with _Thread_local support from C11 or later.
+
+For programs that require per-thread errno without language support (i.e.
+using pthreads), there is an identically signatured version of this function
+in ../pthread/__pt_errno.c which uses pthread keys.
+*/
 
 int *__errno(void)
 {
-        return __libc(ERRNO);
+	THREAD_LOCAL int e = 0;
+        return &e;
 }
-