Add build system scaffolding and libc headers

1 files changed, 55 insertions, 0 deletions

diff --git a/lib/libc/include/io.h b/lib/libc/include/io.h
new file mode 100644
index 00000000..675a3cc3
--- /dev/null
+++ b/lib/libc/include/io.h
@@ -0,0 +1,55 @@
+#ifndef __LIBC_IO
+#define __LIBC_IO
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <stdatomic.h>
+
+typedef __SIZE_TYPE__ size_t;
+
+#define _IO_ERR	 0x4
+#define _IO_EOF	 0x8
+#define _IO_WIDE 0x10
+
+/* Buffering modes */
+#define _IOFBF 0 /* Full buffering */
+#define _IOLBF 1 /* Line buffering */
+#define _IONBF 2 /* No buffering */
+
+/* File access modes */
+#ifndef O_RDONLY
+#define O_RDONLY  0
+#define O_WRONLY  1
+#define O_RDWR	  2
+#define O_ACCMODE 3
+#endif
+
+/* Atomic operations for threading */
+#define LIBC_LOCK(x)                             \
+	while (atomic_flag_test_and_set(&(x))) { \
+	}
+#define LIBC_UNLOCK(x) atomic_flag_clear(&(x))
+
+struct __FILE {
+	int fd;
+	uint32_t flags;
+	int type;
+	pid_t pid;
+	atomic_flag lock;
+	char *buf;
+	int eof;
+	size_t buf_size;
+	size_t buf_pos;
+	size_t buf_len;
+	unsigned char unget_buf[16];
+	size_t unget_cnt;
+	off_t offset;
+	struct __FILE *next;
+};
+
+void __libc_fadd(struct __FILE *f);
+
+#endif