add c-api test

test/CMakeLists.txt

@@ -14,10 +14,18 @@ target_link_libraries(test_ipc_c_api
     fifo_ipc
 )
 
-add_executable(test_ipc_python
-    test_ipc_python.cpp
+add_executable(test_ipc_python_cpp
+    test_ipc_python_cpp.cpp
 )
 
-target_link_libraries(test_ipc_python
+target_link_libraries(test_ipc_python_cpp
+    fifo_ipc
+)
+
+add_executable(test_ipc_python_c
+    test_ipc_python_c.c
+)
+
+target_link_libraries(test_ipc_python_c
     fifo_ipc
 )

test/test_ipc_python_c.c

@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <windows.h>  // FIXME on *nix
+
+#include "ipc/c_api.h"
+
+#define UNUSED(x) (void)x;
+
+int
+main(int argc, char** argv)
+{
+    UNUSED(argc);
+    UNUSED(argv);
+
+    const int verbose = 0;
+    ipc_init_default();
+
+    ipc_start_external_default("python test_server.py", 1);
+
+    printf("[client] pre-start\n");
+    void* ipc = ipc_create_default(0, verbose);
+    printf("[client] start\n");
+
+    double answer;
+    const char* hline = "\n------------------------\n";
+    for (int i = 2; i <= 5; ++i) {
+        Sleep(500);  // FIXME on *nix
+        puts(hline);
+
+        {
+            ipc_write_int(ipc, &i, 1);
+            printf("[client] write int(%d)\n", i);
+        }
+
+        {
+            ipc_read_double(ipc, &answer, 1);
+            printf("[client] read double(%.2e)\n", answer);
+        }
+    }
+
+    puts(hline);
+    printf("[client] finish the work\n\n");
+
+    return 0;
+}