libc: io: implement file io buffering and internal locking for concurrency

2026-04-01 18:51:13 +01:00
parent f2e650d368
commit 548387c43a
23 changed files with 948 additions and 73 deletions
@@ -0,0 +1,53 @@
+#ifndef _LIBC_IO_RINGBUF_H_
+#define _LIBC_IO_RINGBUF_H_
+
+#include <stddef.h>
+
+enum ringbuf_flags {
+	RINGBUF_NONE = 0,
+	RINGBUF_STATIC,
+};
+
+struct ringbuf {
+	enum ringbuf_flags buf_flags;
+	char *buf_ptr;
+	size_t buf_max;
+
+	size_t buf_readp, buf_writep;
+};
+
+extern int __libc_ringbuf_get_read_buffer(
+	struct ringbuf *buf,
+	const char **out_bufp,
+	size_t *out_len);
+extern void __libc_ringbuf_put_read_buffer(
+	struct ringbuf *buf,
+	const char **bufp,
+	size_t *len);
+
+extern int __libc_ringbuf_get_write_buffer(
+	struct ringbuf *buf,
+	char **out_bufp,
+	size_t *out_len);
+extern void __libc_ringbuf_put_write_buffer(
+	struct ringbuf *buf,
+	char **bufp,
+	size_t *len);
+
+extern long __libc_ringbuf_read(struct ringbuf *buf, void *p, size_t count);
+extern long __libc_ringbuf_write(
+	struct ringbuf *buf,
+	const void *p,
+	size_t count);
+
+extern int __libc_ringbuf_clear(struct ringbuf *buf);
+extern int __libc_ringbuf_resize(struct ringbuf *buf, size_t max);
+extern int __libc_ringbuf_resize_static(
+	struct ringbuf *buf,
+	void *p,
+	size_t max);
+
+extern size_t __libc_ringbuf_available(const struct ringbuf *buf);
+extern size_t __libc_ringbuf_capacity(const struct ringbuf *buf);
+
+#endif