From 8ae41297e21c96793ab1f2c8d1abcc5f274501e2 Mon Sep 17 00:00:00 2001
From: "Luke T. Shumaker" <lukeshu@lukeshu.com>
Date: Sun, 22 Sep 2024 00:56:20 -0600
Subject: wip netio

---
 netio_posix.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 netio_posix.c

(limited to 'netio_posix.c')

diff --git a/netio_posix.c b/netio_posix.c
new file mode 100644
index 0000000..0aa8277
--- /dev/null
+++ b/netio_posix.c
@@ -0,0 +1,49 @@
+#include <aio.h>
+#include <sys/socket.h>
+
+#include "coroutine.h"
+
+/* http://davmac.org/davpage/linux/async-io.html */
+void netio_init(void) {
+	sigaction(TODO)
+}
+
+int netio_accept(int socket) {
+	/* AFAICT there is no good POSIX way to do this without busy-polling.  */
+	for (;;) {
+		int conn = accept(socket, NULL, NULL);
+		if (conn < 0) {
+			if (errno == EAGAIN || errno == EWOULDBLOCK) {
+				cr_yield();
+				continue;
+			}
+			return -errno;
+		}
+		return conn;
+	}
+}
+
+int netio_read(int conn, void *buf, size_t count) {
+	int r;
+	struct aiocb ctl_block = {
+		.aio_filedes = conn,
+		.aio_buf = buff,
+		.aio_nbytes = count,
+		.aio_sigevent = {
+			.sigev_notify = SIGEV_SIGNAL,
+			.sigev_signo = SIGIO,
+			.sigev_value = {
+				.sigval_int = (int)cr_getcid(),
+			},
+		},
+	};
+
+	if (aio_read(&ctl_block) < 0)
+		return -errno;
+
+	while ((r = aio_error(&ctl_block)) == EINPROGRESS)
+		cr_pause_and_yield();
+	
+
+	
+}
-- 
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