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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifdef __cplusplus
      6 #error "This file should be compiled as C, not C++."
      7 #endif
      8 
      9 #include <stddef.h>
     10 #include <stdint.h>
     11 #include <string.h>
     12 
     13 // Include all the header files that are meant to be compilable as C. Start with
     14 // core.h, since it's the most important one.
     15 #include "mojo/public/c/system/core.h"
     16 #include "mojo/public/c/system/macros.h"
     17 
     18 // The joys of the C preprocessor....
     19 #define STRINGIFY(x) #x
     20 #define STRINGIFY2(x) STRINGIFY(x)
     21 #define FAILURE(message) \
     22   __FILE__ "(" STRINGIFY2(__LINE__) "): Failure: " message
     23 
     24 // Makeshift gtest.
     25 #define EXPECT_EQ(a, b)                                                  \
     26   do {                                                                   \
     27     if ((a) != (b))                                                      \
     28       return FAILURE(STRINGIFY(a) " != " STRINGIFY(b) " (expected ==)"); \
     29   } while (0)
     30 #define EXPECT_NE(a, b)                                                  \
     31   do {                                                                   \
     32     if ((a) == (b))                                                      \
     33       return FAILURE(STRINGIFY(a) " == " STRINGIFY(b) " (expected !=)"); \
     34   } while (0)
     35 
     36 // This function exists mainly to be compiled and linked. We do some cursory
     37 // checks and call it from a unit test, to make sure that link problems aren't
     38 // missed due to deadstripping. Returns null on success and a string on failure
     39 // (describing the failure).
     40 const char* MinimalCTest(void) {
     41   // MSVS before 2013 *really* only supports C90: All variables must be declared
     42   // at the top. (MSVS 2013 is more reasonable.)
     43   MojoTimeTicks ticks;
     44   MojoHandle handle0, handle1;
     45 
     46   ticks = MojoGetTimeTicksNow();
     47   EXPECT_NE(ticks, 0);
     48 
     49   handle0 = MOJO_HANDLE_INVALID;
     50   EXPECT_NE(MOJO_RESULT_OK, MojoClose(handle0));
     51 
     52   EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
     53             MojoQueryHandleSignalsState(handle0, NULL));
     54 
     55   handle1 = MOJO_HANDLE_INVALID;
     56   EXPECT_EQ(MOJO_RESULT_OK, MojoCreateMessagePipe(NULL, &handle0, &handle1));
     57 
     58   MojoMessageHandle message;
     59   EXPECT_EQ(MOJO_RESULT_OK, MojoCreateMessage(NULL, &message));
     60   EXPECT_EQ(MOJO_RESULT_OK,
     61             MojoSetMessageContext(message, 42, NULL, NULL, NULL));
     62   EXPECT_EQ(MOJO_RESULT_OK, MojoWriteMessage(handle0, message, NULL));
     63   EXPECT_EQ(MOJO_RESULT_OK, MojoReadMessage(handle1, NULL, &message));
     64 
     65   uintptr_t context;
     66   EXPECT_EQ(MOJO_RESULT_OK, MojoGetMessageContext(message, NULL, &context));
     67   EXPECT_EQ(MOJO_RESULT_OK,
     68             MojoSetMessageContext(message, 0, NULL, NULL, NULL));
     69   EXPECT_EQ(42, context);
     70   EXPECT_EQ(MOJO_RESULT_OK, MojoDestroyMessage(message));
     71 
     72   EXPECT_EQ(MOJO_RESULT_OK, MojoClose(handle0));
     73   EXPECT_EQ(MOJO_RESULT_OK, MojoClose(handle1));
     74 
     75   return NULL;
     76 }
     77