From 08ee3cab641f367b642bc29f6540de6be85226bd Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Thu, 25 Aug 2022 10:47:06 +0200
Subject: net: rework API

First, rename all API functions so that they start with net_.

Second, abstract the basic TCP server functionality into tcp_server.c.
This includes reworking net_accept so that it's a simple blocking
operation, and putting the callback stuff to tcp_server.c. Also, the
server now uses detached threads instead of fork(), since I want
connection handlers to share memory.
---
 src/tcp_server.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/tcp_server.c

(limited to 'src/tcp_server.c')

diff --git a/src/tcp_server.c b/src/tcp_server.c
new file mode 100644
index 0000000..dc7d47b
--- /dev/null
+++ b/src/tcp_server.c
@@ -0,0 +1,92 @@
+#include "tcp_server.h"
+#include "log.h"
+#include "net.h"
+
+#include <pthread.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int tcp_server_create(struct tcp_server *server, const char *port)
+{
+	server->fd = net_bind(port);
+	if (server->fd < 0)
+		return server->fd;
+
+	return 0;
+}
+
+void tcp_server_destroy(const struct tcp_server *server)
+{
+	close(server->fd);
+}
+
+struct child_context {
+	int fd;
+	tcp_server_conn_handler handler;
+	void *arg;
+};
+
+static void *connection_thread(void *_ctx)
+{
+	struct child_context *ctx = (struct child_context *)_ctx;
+	ctx->handler(ctx->fd, ctx->arg);
+	close(ctx->fd);
+	free(ctx);
+	return NULL;
+}
+
+int tcp_server_accept(const struct tcp_server *server, tcp_server_conn_handler handler, void *arg)
+{
+	struct child_context *ctx;
+	pthread_attr_t child_attr;
+	pthread_t child;
+	int conn_fd, ret = 0;
+
+	ret = net_accept(server->fd);
+	if (ret < 0) {
+		print_errno("accept");
+		return ret;
+	}
+	conn_fd = ret;
+
+	ctx = malloc(sizeof(*ctx));
+	if (!ctx) {
+		print_errno("malloc");
+		ret = -1;
+		goto close_conn;
+	}
+	*ctx = (struct child_context){conn_fd, handler, arg};
+
+	ret = pthread_attr_init(&child_attr);
+	if (ret < 0) {
+		print_errno("pthread_attr_init");
+		goto free_ctx;
+	}
+
+	ret = pthread_attr_setdetachstate(&child_attr, PTHREAD_CREATE_DETACHED);
+	if (ret < 0) {
+		print_errno("pthread_attr_setdetachstate");
+		goto destroy_attr;
+	}
+
+	ret = pthread_create(&child, &child_attr, connection_thread, ctx);
+	if (ret < 0) {
+		print_errno("pthread_create");
+		goto destroy_attr;
+	}
+
+	pthread_attr_destroy(&child_attr);
+
+	return ret;
+
+destroy_attr:
+	pthread_attr_destroy(&child_attr);
+
+free_ctx:
+	free(ctx);
+
+close_conn:
+	close(conn_fd);
+
+	return ret;
+}
-- 
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