Add build system scaffolding and libc headers

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/libc/stdlib/atexit.c b/lib/libc/stdlib/atexit.c
new file mode 100644
index 00000000..6c84fd4a
--- /dev/null
+++ b/lib/libc/stdlib/atexit.c
@@ -0,0 +1,16 @@
+#include <stdlib.h>
+
+static void (*__atexit_fvec[32])(void) = { NULL };
+
+int atexit(void (*func)(void))
+{
+	for (int i = 0; i < 32; i++) {
+		if (__atexit_fvec[i] == NULL) {
+			__atexit_fvec[i] = func;
+			__atexit_fvec[i + 1] = NULL;
+			return 0;
+		}
+	}
+
+	return -1;
+}