new: finishing up base mptp functions

examples/Makefile

@@ -1,7 +1,11 @@
 CC = gcc
 
-all: ../dist/example_pool
+all: ../dist/example_pool ../dist/example_server
 
 ../dist/example_pool: pool/*.c ../dist/libmp.so
 	mkdir -pv ../dist
-	$(CC) -L../dist $< -lmp -o $@ 
+	$(CC) -L../dist $< -lmp -o $@
+
+../dist/example_server: server/*.c ../dist/libmp.so
+	mkdir -pv ../dist
+	$(CC) -L../dist $< -lmp -o $@

examples/server/main.c

@@ -0,0 +1,52 @@
+#include "../../include/error.h"
+#include "../../include/mptp.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+
+int main(int argc, char *argv[]) {
+  int ret = EXIT_FAILURE;
+
+  if (argc != 3) {
+    printf("usage: %s <host> <port>\n", argv[0]);
+    return ret;
+  }
+
+  int porti = atoi(argv[2]);
+  if (porti <= 0 || porti > UINT16_MAX) {
+    printf("bad port number\n");
+    return ret;
+  }
+
+  int sock = lm_mptp_server_listen(argv[1], porti);
+  if (sock < 0) {
+    printf("failed to start the server: %s\n", lm_strerror());
+    return ret;
+  }
+
+  lm_mptp_t       packet;
+  struct sockaddr addr;
+
+  while (lm_mptp_server_recv(sock, &packet, &addr)) {
+    switch (MPTP_FLAGS_TYPE(&packet)) {
+    case MPTP_C2S_PING:
+      bzero(&packet, sizeof(packet));
+      lm_mptp_packet_init(&packet, false, MPTP_S2C_PONG, true);
+
+      lm_mptp_server_send(sock, &packet, &addr);
+      break;
+
+    default:
+      bzero(&packet, sizeof(packet));
+      lm_mptp_packet_init(&packet, false, MPTP_S2C_WHAT, true);
+
+      lm_mptp_server_send(sock, &packet, &addr);
+      break;
+    }
+  }
+
+  ret = EXIT_SUCCESS;
+end:
+  lm_mptp_close(sock);
+  return ret;
+}