diff --git a/common.h b/common.h
new file mode 100644
index 0000000..1d2228a
--- /dev/null
+++ b/common.h
@@ -0,0 +1,40 @@
+/**
+ * @file common.h
+ * @date 2018-05-21
+ *
+ * @brief Header file for common includes and constants as well as data structures.
+ */
+
+// guard block
+#ifndef COMMON_H
+#define COMMON_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+#include <string.h>
+
+#include <errno.h>
+#include <signal.h>
+
+#include <semaphore.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+
+#define SHM_NAME "/01527193"
+
+#define PERMISSION (0600)
+
+#define SEM_FREE_SPACE "/sem_free_space_01527193"
+#define SEM_USED_SPACE "/sem_used_space_01527193"
+#define SEM_WRITE_END "/sem_write_end_01527193"
+
+struct circ_buf {
+	int id;
+};
+
+#endif /* ifndef COMMON_H */
diff --git a/generator.c b/generator.c
index e69de29..00ccb92 100644
--- a/generator.c
+++ b/generator.c
@@ -0,0 +1,46 @@
+/**
+ * @file generator.c
+ * @date 2018-05-21
+ *
+ * @brief Client program which generates solutions and submits them.
+ */
+
+#include "common.h"
+
+static const char *pname;
+
+struct sigaction sa;
+
+static volatile sig_atomic_t quit = 0;
+
+static void sig_handler(int signum)
+{
+	quit = 1;
+}
+
+void usage(void)
+{
+	fprintf(stderr, "SYNOPSIS\n"
+			"\tgenerator EDGE1...\n"
+			"EXAMPLE\n"
+			"\tgenerator 0-1 1-2 1-3 1-4 2-4 3-6 4-3 4-5 6-0\n");
+	exit(EXIT_FAILURE);
+}
+
+int main(int argc, char *argv[])
+{
+	if (argc == 1)
+		usage();
+
+	struct sigaction sa;
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = &sig_handler;
+	sigaction(SIGINT, &sa, NULL);
+	sigaction(SIGTERM, &sa, NULL);
+
+	while (quit == 0) {
+
+	}
+
+	return 0;
+}
diff --git a/supervisor.c b/supervisor.c
index e69de29..6edc971 100644
--- a/supervisor.c
+++ b/supervisor.c
@@ -0,0 +1,44 @@
+/**
+ * @file supervisor.c
+ * @date 2018-05-21
+ *
+ * @brief Server program which reads solutions and orders them.
+ */
+
+#include "common.h"
+
+static const char *pname;
+
+struct sigaction sa;
+
+static volatile sig_atomic_t quit = 0;
+
+static void sig_handler(int signum)
+{
+	quit = 1;
+}
+
+void usage(void)
+{
+	fprintf(stderr, "SYNOPSIS\n"
+			"\tsupervisor\n");
+	exit(EXIT_FAILURE);
+}
+
+int main(int argc, char *argv[])
+{
+	if (argc != 1)
+		usage();
+
+	struct sigaction sa;
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = &sig_handler;
+	sigaction(SIGINT, &sa, NULL);
+	sigaction(SIGTERM, &sa, NULL);
+
+	while (quit == 0) {
+
+	}
+
+	return 0;
+}