Squash commits for public release

libs/libc/include/x/shared_buffer.h

@@ -0,0 +1,18 @@
+#ifndef _LIBC_SYS_SHARED_BUFFER_H
+#define _LIBC_SYS_SHARED_BUFFER_H
+
+#include <bits/sys/select.h>
+#include <bits/time.h>
+#include <stddef.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+int shared_buffer_create(uint8_t** buffer, size_t size);
+int shared_buffer_get(int id, uint8_t** buffer);
+int shared_buffer_free(int id);
+
+__END_DECLS
+
+#endif // _LIBC_SYS_SHARED_BUFFER_H