From a777955331cecb25fb503f5baf3583524dc8a1df Mon Sep 17 00:00:00 2001
From: Syndamia <kamen@syndamia.com>
Date: Thu, 7 Dec 2023 11:51:57 +0200
Subject: [server] Accept multiple connection simultaniously

---
 server.c | 55 +++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 43 insertions(+), 12 deletions(-)

(limited to 'server.c')

diff --git a/server.c b/server.c
index c7e3672..42faf7e 100644
--- a/server.c
+++ b/server.c
@@ -7,11 +7,29 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <fcntl.h>
+#include <sys/wait.h>
 
 #include <string.h>
 #include <util.h>
 
+void on_connection(int fd_client) {
+	char buff[256];
+	read(fd_client, buff, 256);
+
+	int fd;
+	herr(fd = open(buff, O_RDONLY), "open");
+	memset(buff, 0, sizeof(buff));
+	while (read(fd, buff, 256)) {
+		write(fd_client, buff, strlen(buff));
+		memset(buff, 0, sizeof(buff));
+	}
+	close(fd);
+}
+
 int main(int argc, char* argv[]) {
+	/*
+	 * Create socket for accepting connections
+	 */
 	int fd_socket;
 	herr(fd_socket = socket(AF_INET, SOCK_STREAM, 0), "socket");
 
@@ -21,26 +39,39 @@ int main(int argc, char* argv[]) {
 	};
 	herr(inet_aton("127.0.0.1", &sa_socket.sin_addr.s_addr), "inet_aton");
 
+	// Reuse address when in TIME_WAIT state, after listening socket was closed
+	// https://stackoverflow.com/a/10651048/12036073
+	// https://superuser.com/questions/173535/what-are-close-wait-and-time-wait-states#comment951880_173543
+	int true = 1;
+	herr(setsockopt(fd_socket, SOL_SOCKET, SO_REUSEADDR, &true, sizeof(int)), "setsockopt");
+
 	herr(bind(fd_socket, (struct sockaddr*)&sa_socket, sizeof(struct sockaddr_in)), "bind");
 
 	herr(listen(fd_socket, 50), "listen");
 
+	/*
+	 * Accept connection on the socket
+	 */
+
 	struct sockaddr_in sa_client;
 	socklen_t sa_client_size = sizeof(struct sockaddr_in);
 	int fd_client;
-	herr(fd_client = accept(fd_socket, (struct sockaddr*)&sa_client, &sa_client_size), "accept");
-
-	char buff[256];
-	read(fd_client, buff, 256);
+	int count = 0;
+	while (count < 2) {
+		herr(fd_client = accept(fd_socket, (struct sockaddr*)&sa_client, &sa_client_size), "accept");
+		count++;
+		int fp = fork();
 
-	int fd;
-	herr(fd = open(buff, O_RDONLY), "open");
-	memset(buff, 0, sizeof(buff));
-	while (read(fd, buff, 256)) {
-		write(fd_client, buff, strlen(buff));
-		memset(buff, 0, sizeof(buff));
+		if (fp == 0) {
+			close(fd_socket);
+			on_connection(fd_client);
+			close(fd_client);
+			return 0;
+		}
+		close(fd_client);
 	}
-	close(fd);
-
 	close(fd_socket);
+
+	printf("Exiting");
+	while(wait(NULL) > 0);
 }
-- 
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