Introduced Topic-12

Topic-12/client.c

@@ -0,0 +1,51 @@
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+void run_client(int port, char *msg) {
+	int sockfd = socket(AF_INET, SOCK_STREAM, 0);
+	if (sockfd < 0) {
+		fprintf(stderr, "socket: ");
+		exit(EXIT_FAILURE);
+	}
+
+	struct sockaddr_in server_addr;
+	memset(&server_addr, 0, sizeof(server_addr));
+	server_addr.sin_family = AF_INET;
+	server_addr.sin_addr.s_addr = INADDR_ANY;
+	server_addr.sin_port = htons(port);
+    if (connect(sockfd, (const struct sockaddr *)&server_addr, sizeof(server_addr))) {
+    	fprintf(stderr, "connect: ");
+    	exit(EXIT_FAILURE);
+    }
+
+    int rv = sendto(sockfd, msg, strlen(msg), 0, (const struct sockaddr *)&server_addr, sizeof(server_addr));
+    if (rv < 0) {
+    	fprintf(stderr, "sendto: ");
+    	exit(EXIT_FAILURE);
+    }
+
+    char buffer[100];
+    memset(&buffer, 0, sizeof(buffer));
+    socklen_t server_addr_len = sizeof(server_addr);
+    rv = recvfrom(sockfd, buffer, sizeof(buffer), 0, (struct sockaddr *)&server_addr, &server_addr_len);
+    if (rv < 0) {
+    	fprintf(stderr, "recvfrom: ");
+    	exit(EXIT_FAILURE);
+    }
+
+    printf("Server reply: %s\n", buffer);
+
+	close(sockfd);
+}
+
+int main(int arc, char *argv[]) {
+    
+    run_client(2137, argv[1]);
+
+	return 0;
+}

Topic-12/server.c

@@ -0,0 +1,16 @@
+void run_server(int port) {
+	
+}
+
+int main(int argc, char *argv[]) {
+	// Socket
+	// setsockopt
+	// Bind
+	// listen()
+	// accept
+	// send/recv
+
+	run_server(2137);
+
+	return 0;
+}