tried to add basic socket unit tests (nonsense only for now); made LOCK_TCPIP_CORE()/UNLOCK_TCPIP_CORE() overridable for that

test/unit/api/test_sockets.c

@@ -0,0 +1,68 @@
+#include "test_sockets.h"
+
+#include "lwip/sockets.h"
+#include "lwip/stats.h"
+
+#include "lwip/tcpip.h"
+
+
+/* Setups/teardown functions */
+
+static void
+sockets_setup(void)
+{
+}
+
+static void
+sockets_teardown(void)
+{
+}
+
+#ifndef NUM_SOCKETS
+#define NUM_SOCKETS MEMP_NUM_NETCONN
+#endif
+
+/* Verify basic sockets functionality
+ */
+START_TEST(test_sockets_basics)
+{
+  int s, i, ret;
+  int s2[NUM_SOCKETS];
+  LWIP_UNUSED_ARG(_i);
+
+  s = lwip_socket(AF_INET, SOCK_STREAM, 0);
+  fail_unless(s >= 0);
+  lwip_close(s);
+
+  for (i = 0; i < NUM_SOCKETS; i++) {
+    s2[i] = lwip_socket(AF_INET, SOCK_STREAM, 0);
+    fail_unless(s2[i] >= 0);
+  }
+
+  /* all sockets used, now it should fail */
+  s = lwip_socket(AF_INET, SOCK_STREAM, 0);
+  fail_unless(s == -1);
+  /* close one socket */
+  ret = lwip_close(s2[0]);
+  fail_unless(ret == 0);
+  /* now it should succeed */
+  s2[0] = lwip_socket(AF_INET, SOCK_STREAM, 0);
+  fail_unless(s2[0] >= 0);
+
+  /* close all sockets */
+  for (i = 0; i < NUM_SOCKETS; i++) {
+    ret = lwip_close(s2[i]);
+    fail_unless(ret == 0);
+  }
+}
+END_TEST
+
+/** Create the suite including all tests for this module */
+Suite *
+sockets_suite(void)
+{
+  testfunc tests[] = {
+    TESTFUNC(test_sockets_basics)
+  };
+  return create_suite("SOCKETS", tests, sizeof(tests)/sizeof(testfunc), sockets_setup, sockets_teardown);
+}

test/unit/api/test_sockets.h

@@ -0,0 +1,8 @@
+#ifndef LWIP_HDR_TEST_SOCKETS_H
+#define LWIP_HDR_TEST_SOCKETS_H
+
+#include "../lwip_check.h"
+
+Suite *sockets_suite(void);
+
+#endif