initial check-in, version 0.5.0

src/env/__libc_start_main.c

@@ -0,0 +1,26 @@
+#include "libc.h"
+
+/* Any use of __environ/environ will override this symbol. */
+char **__dummy_environ = (void *)-1;
+weak_alias(__dummy_environ, ___environ);
+
+int __libc_start_main(
+	int (*main)(int, char **, char **), int argc, char **argv,
+	int (*init)(int, char **, char **), void (*fini)(void),
+	void (*ldso_fini)(void))
+{
+	/* Save the environment if it may be used by libc/application */
+	char **envp = argv+argc+1;
+	if (___environ != (void *)-1) ___environ = envp;
+
+	/* Avoid writing 0 and triggering unnecessary COW */
+	if (ldso_fini) libc.ldso_fini = ldso_fini;
+	if (fini) libc.fini = fini;
+
+	/* Execute constructors (static) linked into the application */
+	if (init) init(argc, argv, envp);
+
+	/* Pass control to to application */
+	exit(main(argc, argv, envp));
+	return 0;
+}