add errno.h

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/include/errno.h b/include/errno.h
new file mode 100644
index 0000000..6a94d76
--- /dev/null
+++ b/include/errno.h
@@ -0,0 +1,46 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _ERRNO_H
+#define _ERRNO_H
+#include <slibc/version.h>
+
+
+#include <slibc/features.h>
+
+/* TODO include error definitions */
+
+
+
+/**
+ * A modifiable lvalue used to describe an error
+ * that has occurred in the thread.
+ */
+#define errno  (*__errno())
+
+
+/**
+ * Helper definition to `errno` used to
+ * assured that the value is thread-dependent
+ * and supported on all revisions of C.
+ */
+volatile int* __errno(void) __GCC_ONLY(__attribute__((__const__))); /* TODO not implemented */
+
+
+
+#endif
+