Added mock gdbstub implementation

src/gdbstub/gdbstub.c

@@ -0,0 +1,71 @@
+#include "gdbstub.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+/* Sockets */
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#define INVALID_SOCKET -1
+#define SOCKET_ERROR -1
+typedef int socket_t;
+typedef struct sockaddr_in sockaddr_in_t;
+typedef struct sockaddr sockaddr_t;
+
+#define GDBSTUB_PORT 1234
+
+socket_t gdbstub_server_socket;
+socket_t gdb_socket;
+
+/*
+* Starts a server that will listen for GDB connections
+*/
+void gdbstub_start()
+{
+    socket_t sock = socket(AF_INET, SOCK_STREAM, 0);
+    if(sock == INVALID_SOCKET)
+    {
+        fprintf(stderr, "Could not create gdbstub server socket: %s\n", strerror(errno));
+        exit(EXIT_FAILURE);
+    }
+    sockaddr_in_t sin = {0};
+    sin.sin_addr.s_addr = htonl(INADDR_ANY);
+    sin.sin_family = AF_INET;
+    sin.sin_port = htons(GDBSTUB_PORT);
+
+    if(bind(sock, (sockaddr_t*) &sin, sizeof(sin)) == SOCKET_ERROR)
+    {
+        fprintf(stderr, "Could not bind gdbstub server socket: %s\n", strerror(errno));
+        exit(EXIT_FAILURE);
+    }
+
+    if(listen(sock, 1) == SOCKET_ERROR)
+    {
+        fprintf(stderr, "Could not listen gdbstub server socket: %s\n", strerror(errno));
+        exit(EXIT_FAILURE);
+    }
+
+    gdbstub_server_socket = sock;
+}
+
+/*
+* Wait for a client (gdb) to connect to this server
+*/
+void gdbstub_wait_for_connection()
+{
+    sockaddr_in_t csin = {0};
+    socket_t c_socket;
+    socklen_t sinsize = sizeof(csin);
+
+    c_socket = accept(gdbstub_server_socket, (sockaddr_t*) &csin, &sinsize);
+    if(c_socket == INVALID_SOCKET)
+    {
+        fprintf(stderr, "Could not accept client on gdbstub server: %s\n", strerror(errno));
+        exit(EXIT_FAILURE);
+    }
+
+    gdb_socket = c_socket;
+}

src/gdbstub/gdbstub.h

@@ -0,0 +1,7 @@
+#ifndef GDBSTUB_H
+#define GDBSTUB_H
+
+void gdbstub_start();
+void gdbstub_wait_for_connection();
+
+#endif